CN111213666A - Rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron methyl - Google Patents
Rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron methyl Download PDFInfo
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- CN111213666A CN111213666A CN202010130821.2A CN202010130821A CN111213666A CN 111213666 A CN111213666 A CN 111213666A CN 202010130821 A CN202010130821 A CN 202010130821A CN 111213666 A CN111213666 A CN 111213666A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
- A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
- A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
- A01N47/36—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N41/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a sulfur atom bound to a hetero atom
- A01N41/02—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a sulfur atom bound to a hetero atom containing a sulfur-to-oxygen double bond
- A01N41/10—Sulfones; Sulfoxides
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
- A01N43/54—1,3-Diazines; Hydrogenated 1,3-diazines
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Abstract
The invention relates to a rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron-methyl, wherein the active ingredients of the weeding composition are ternary active ingredients of pyriminobac-methyl, mesotrione and bensulfuron-methyl, and the weight ratio of the pyriminobac-methyl, mesotrione and bensulfuron-methyl is 2.6-2.8:4.3-4.7: 4-5. The weeding composition has a synergistic effect, can prevent and remove annual gramineous weeds and broadleaf weeds and nutgrass flatsedge in a paddy field by expanding a weeding spectrum, has an obvious weeding effect, does not influence the following crops, and is an ideal herbicide.
Description
The application is a divisional application with a parent application number of CN201710017202.0 and is named as 'a rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron-methyl'.
Technical Field
The invention relates to the technical field of pesticide herbicides, and in particular relates to a rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron-methyl.
Background
Chemical weeding is one of the main means for controlling field weeds in agriculture. In recent years, resistance has been developed in many weeds due to the large area of individual use of some herbicide species; meanwhile, when weeds in fields occur, the weeds are complex in phase and various in variety, such as gramineous weeds, broadleaf weeds, nutgrass flatsedge and the like, and the problems cannot be effectively solved by using a single-variety herbicide, so that the defects of one aspect are shown. By screening different herbicide compound formulas, a reasonable formula is screened out, the actual control effect on weeds can be effectively improved, the weed control spectrum is enlarged, the dosage is reduced, the cost is reduced, the environmental pollution is reduced, the generation of drug resistance of weeds is delayed, and the method is an important means for comprehensively treating weeds in agriculture at present.
In recent years, rice weeds are more serious, and particularly, malignant weeds such as rice barnyard grass, moleplant seeds, jiejia japonica, cyperus rotundus and the like appear, so that the rice yield is greatly influenced. At present, the rice herbicide has more varieties, mainly comprises two herbicides, namely pretilachlor and post-emergence herbicide, and has poor pesticide effect; post-emergence herbicides such as cyhalofop-butyl and penoxsulam have high cost, large residual quantity in soil, easy generation of phytotoxicity to the next crop and high resistance to weeds.
Pyriminobac-methyl, a pyrimidine salicylic acid herbicide, can be absorbed by the stems, leaves and roots of weeds and quickly transmitted to the whole plants to inhibit the biosynthesis of acetolactate synthase and amino acid, thereby inhibiting and hindering the cell division in the bodies of the weeds, stopping the growth of the weeds and finally leading the weeds to whiten and die. Has special effect on barnyard grass in rice field and is extremely safe to rice.
Mesotrione (mesotrione) is an effective inhibitor of HPPD (4-phenylpyruvic acid dioxygenase), and the optimum pH value of the enzyme in phosphate buffer is 7.3, but the activity range is wide; when the temperature is increased from 23 ℃ to the optimum temperature of 30 ℃, the activity is improved by 2 times. HPPD is inhibited, causing tyrosine accumulation in plant meristems plants whiten and die. The suitable crops are rice, and the control objects comprise annual broadleaf weeds and part of gramineous weeds (the control effect on broadleaf is better than that of gramineous plants). The rice is safe under normal dosage.
Bensulfuron-methyl (bensuluron-methyl), a selective systemic herbicide. The effective components can diffuse rapidly in water, and can be absorbed and transferred to weed root and leaf, inhibit biosynthesis of amino acids, lysine and isoleucine, and prevent cell division and growth. The growth function of the sensitive weeds is hindered, young tissues are yellowed early to inhibit the growth of leaves, and the growth and the necrosis of roots are hindered. The effective components enter the rice body and are quickly metabolized into harmless inert chemicals, and the rice is safe. The application method is flexible, and can be used for methods such as toxic soil, toxic sand, spraying, splashing and the like. The weeding composition has small mobility in soil and small influence of temperature and soil quality on the weeding effect.
Currently, CN200910144094.9 discloses a herbicidal composition for paddy fields, which is prepared by combining mesotrione as an active ingredient with any one or more of cyhalofop-butyl, bensulfuron-methyl, pyrazosulfuron-ethyl, quinclorac, mefenacet, bispyribac-sodium or penoxsulam herbicide. The compounding of mesotrione, cyhalofop-butyl and bensulfuron methyl has undesirable effect on resistant cockspur grass and other weeds. CN201310267261.5 relates to a weeding composition containing bensulfuron-methyl and pyriminobac-methyl, which can not solve weeds such as caper euphorbia seed, water onion, short arrowhead and the like.
The ternary compound patent of pyriminobac-methyl, mesotrione and bensulfuron-methyl is not reported at present. The three are compounded according to a certain proportion, and have outstanding effect on the weeds.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the high-efficiency rice herbicide which has broad-spectrum weed control effect, is economic and efficient, has high safety to rice and does not influence the normal growth of rice. In order to achieve the above object, the present invention provides the following technical solutions:
the active ingredients of the weeding composition are pyriminobac-methyl, mesotrione and bensulfuron-methyl, and the weight ratio of the pyriminobac-methyl, mesotrione and bensulfuron-methyl is 2.6-2.8:4.3-4.7: 4-5.
Preferably, the weight ratio of pyriminobac-methyl, mesotrione and bensulfuron-methyl is 2.8:4.7: 4.
The mass sum of the pyriminobac-methyl, the mesotrione and the bensulfuron methyl accounts for 0.5-85% of the total mass of the weeding composition.
The dosage form of the weeding composition is a pesticide dosage form such as a suspending agent, a suspending emulsion, missible oil, a microemulsion, an emulsion in water, wettable powder or water dispersible granules.
Compared with the prior art, the invention has the advantages that:
the result of the invention shows that the cotoxicity coefficient of the compounded three active ingredients of pyriminobac-methyl, mesotrione and bensulfuron methyl according to the proportion of 2.6-2.8:4.3-4.7:4-5 is obviously more than 120, thereby achieving the obvious synergistic effect, and the three active ingredients of pyriminobac-methyl, mesotrione and bensulfuron methyl have the obvious synergistic effect on annual gramineous weeds, broadleaf weeds and nutgrass flatsedge.
A safety test for rice shows that the compounded stem and leaf treatment of the three active ingredients of pyriminobac-methyl, mesotrione and bensulfuron methyl can inhibit the growth of rice by 10% of ED 10-419.3251, inhibit the growth of weeds by 90% of ED 90-100.9953 and have selectivity coefficient of 419.3251/100.995-4.18 >2, so that the pesticide has obvious selectivity, and the three active ingredients of pyriminobac-methyl, mesotrione and bensulfuron methyl have good safety for rice.
The herbicide composition of the invention is proved by field efficacy test for 2 years that no phytotoxicity symptom is seen from the application to the mature period of the rice, and the herbicide composition is safe to the rice. The control effect of the grass reaches more than 80% in 10 days and more than 95% in 30 days, the control effect is obviously enhanced along with the increase of the dosage, the good weeding effect can be achieved in the paddy field at 6 g/mu, compared with the single use of one of the active ingredients, the weeding composition enlarges the weeding spectrum, and has obvious synergistic effect on gramineous weeds, broadleaf weeds and nutgrass flatsedge. The herbicide can control weeds in the whole growth period of crops by once application, has obvious weeding effect, is environment-friendly and has no influence on next-stubble crops.
Compared with the prior art, the weeding composition disclosed by the invention can prevent and remove gramineous weeds, broadleaf weeds and nutgrass flatsedge, is safe to rice, has no influence on afterculture crops, and has a good application prospect.
Detailed Description
The invention discloses a post-emergence weeding composition containing three active ingredients, namely pyriminobac-methyl, mesotrione and bensulfuron-methyl. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the invention has been described in terms of preferred embodiments, it will be apparent to those skilled in the art that the techniques of the invention can be implemented and practiced with modification, or with appropriate modification, and combinations of the methods and applications described herein without departing from the spirit, scope, and spirit of the invention.
The invention is further illustrated by the following examples:
example 1 Water dispersible granules of pyriminobac-sodium mesotrione bensulfuron (pyriminobac-sodium mesotrione: bensulfuron-methyl 8:22:13)
8kg of pyriminobac-methyl, 22kg of mesotrione, 13kg of bensulfuron-methyl, 7kg of dispersant, naphthalenesulfonate formaldehyde condensate (D-425), 5kg of wetting agent, namely a mixture (EFW) of alkylnaphthalenesulfonate and an anionic wetting agent, 5kg of disintegrant, namely ammonium sulfate, 2kg of binder, namely polyvinyl alcohol (PVA) and 38kg of carrier kaolin. The water dispersible granules are obtained through full mixing, airflow crushing, mixing, granulation, drying and screening.
Example 2 23% pyriminobac-methyl-mesotrione bensulfuron suspension (pyriminobac-methyl: mesotrione: bensulfuron-methyl 5:10:8)
5kg of pyriminobac-methyl, 10kg of mesotrione, 8kg of bensulfuron methyl, 8kg of sodium lignosulfonate (dispersing agent), 5kg of fatty alcohol-polyoxyethylene ether (wetting agent), 1kg of xanthan gum (thickening agent), 0.7kg of sodium benzoate, (preservative), 2kg of polyoxyethylene polyoxypropylene ether (defoaming agent), 5kg of glycol (antifreezing agent) and 55.3kg of carrier water. The suspending agent is obtained by fully mixing, blending, ball milling, crushing, adjusting and packaging.
Example 3 34% pyriminobac-sodium mesotrione bensulfuron water dispersible granule (pyriminobac-sodium mesotrione: bensulfuron-methyl 6:17.5:10.5)
6kg of pyriminobac-methyl, 17.5kg of mesotrione, 10.5kg of bensulfuron-methyl, 7kg of dispersant-naphthalenesulfonate formaldehyde condensate (D-425), 5kg of wetting agent-mixture of alkylnaphthalenesulfonate and anionic wetting agent (EFW), 5kg of disintegrant-ammonium sulfate, 2kg of binder-polyvinyl alcohol (PVA) and 47kg of carrier kaolin are taken. The water dispersible granules are obtained through full mixing, airflow crushing, mixing, granulation, drying and screening.
Example 4 11% pyriminobac-sodium mesotrione bensulfuron dispersible oil suspension (pyriminobac-sodium mesotrione: bensulfuron-methyl 3:5:3)
3kg of pyriminobac-methyl, 5kg of mesotrione, 3kg of bensulfuron-methyl, 15kg of dispersant-block polyether nonionic surfactant (Pluronic125), 2kg of thickener-magnesium aluminum silicate and 72kg of carrier methyl oleate are taken. The dispersible oil suspending agent is obtained by fully mixing, blending, ball milling, crushing, adjusting and packaging.
Example 5 50% wettable powder of pyriminobac-methyl, mesotrione and bensulfuron (pyriminobac-methyl: mesotrione: 8:27:15)
8kg of pyriminobac-methyl, 27kg of mesotrione, 15kg of bensulfuron-methyl, 4kg of naphthalenesulfonate formaldehyde condensate NNO as dispersant, 3kg of wetting agent sodium dodecyl sulfate K12, 4kg of white carbon black and light calcium carbonate are taken to make up to 100 kg. The wettable powder is obtained by fully mixing, airflow crushing and mixing.
Example 6 Water dispersible granules of 46% pyriminobac-sodium mesotrione bensulfuron (pyriminobac-sodium mesotrione: bensulfuron-methyl 8:18:13)
8kg of pyriminobac-methyl, 18kg of mesotrione, 13kg of bensulfuron-methyl, 7kg of dispersant-naphthalenesulfonate formaldehyde condensate (D-425), 5kg of wetting agent-mixture of alkylnaphthalenesulfonate and anionic wetting agent (EFW), 5kg of disintegrant-ammonium sulfate, 2kg of binder-polyvinyl alcohol (PVA) and 42kg of carrier kaolin. The water dispersible granules are obtained through full mixing, airflow crushing, mixing, granulation, drying and screening.
Example 7 indoor Activity measurement test report of Combined action of Bispyribac-sodium, mesotrione and bensulfuron methyl on Stem and leaf treatment
Under the greenhouse condition, a pot experiment method is adopted to research the weeding effect of ternary combination of pyriminobac-methyl, mesotrione and bensulfuron-methyl, and the combined action type of the three components mixed in different proportions is evaluated by a Sunweier co-toxicity coefficient method, so that scientific basis is provided for reasonable mixing of topramezone, florasulam and atrazine.
Zhendao 18, a variety of rice to be tried
The weed Euphorbia lathyris L (European), Echinochlorus crusgalli L (L.), Echinochlorus rugova (L.), Belauv), Arthropoda japonica (Rotalainica (Willd.) Koehne.), Scirpus validus Vahl, Arrowland arrowhead (Sagittaria pygmaea Miq), Cyperus difformis L (Cyperus difformis L.) were tested (seeds were harvested in the field in the last year, the germination rate was more than 85%).
The test agent is 97% pyriminobac-sodium original drug (chemical plant of Suzhou city, Anhui province); 98% mesotrione technical (Zhejiang grass science ltd); 97% bensulfuron (Shandong Weifang Runfeng chemical Co., Ltd.).
Weighing a certain amount of the original drug by an electronic balance, adding a proper amount of emulsifier, dissolving by acetone, and finally diluting the original drug to the required concentration (namely the concentration indicated in the table 1) by using a 0.1% Tween 80 aqueous solution.
(1) The combined action of pyriminobac-methyl and mesotrione:
the pyriminobac-methyl, the mesotrione single agent and 5 mixed pyriminobac-methyl and mesotrione preparations are respectively set with 5 dosages (C is the mass ratio of the pyriminobac-methyl to the mesotrione is 2:7), blank controls are set, and each test treatment is repeated for 4 times. The treatment doses are detailed in table 1.
TABLE 1 test treatment and test levels (amount ga.i./667 m)2)
Spraying the stems and leaves of the rice in the 3-leaf stage and the 2-4-leaf stage of the weeds. The test was carried out by spraying the drug 1 time in 2016, 6 months and 5 days. After the application, the damage symptoms of the rice and the weeds are recorded in detail, and 20d after the application, fresh weight measurement is carried out and compared with control treatment, and the fresh weight control effect is calculated.
Test results the combined action type after the mixture is evaluated by the co-toxicity coefficient method of the Sun Yunpei. And calculating the actual virulence index, the mixed agent theoretical virulence index and the cotoxicity coefficient according to the SUN, Y-P (Sun cloud Peel) method. And solving a regression equation by taking the logarithm of the concentration as X and the pest control efficiency value as Y.
Actual virulence index is LD50 × 100 for standard medicament LD 50/cocktail;
theoretical virulence index ═ Σ (virulence index of the test agent x the percentage of active ingredient of the agent in the mixture);
the co-toxicity coefficient is the actual toxicity index/theoretical toxicity index of the mixed preparation multiplied by 100;
in the test, pyriminobac-methyl and bensulfuron-methyl are used as standard medicaments.
The determination standard is that the cotoxicity coefficient is less than 80 and is antagonistic, the cotoxicity coefficient is additive between 80 and 120, and the cotoxicity coefficient is synergistic if the cotoxicity coefficient is more than 120.
The combined action of pyriminobac-methyl and bensulfuron-methyl is shown in table 2 below (the control effect in the table is an average of four data):
table 2: the pyriminobac-methyl and the mesotrione are mixed, and the fresh weight control effect on the weeds is achieved within 20 days after the pyriminobac-methyl and the mesotrione are applied
As can be seen from Table 2: the drug has the toxic action and the control effect on weeds. And calculating respective virulence regression equation, LD50, actual virulence index, theoretical virulence index and cotoxicity coefficient by a formula. Are shown in Table 3.
Table 3: combined action of pyriminobac-methyl and mesotrione in mixed pairing of weeds
| Treatment of | Regression equation | Correlation coefficient | LD50 | Actual virulence index | Theoretical virulence index | Co-toxicity coefficient |
| A | Y＝2.0530x+4.5595 | 0.9968 | 1.6389 | 100 | / | / |
| B | Y＝1.9836x+3.9707 | 0.9954 | 3.3030 | 49.62 | / | / |
| C | Y＝1.8471x+4.5034 | 0.9950 | 1.8572 | 88.25 | 60.81 | 145.12 |
| D | Y＝1.6753x+4.6275 | 0.9944 | 1.6686 | 98.22 | 64.44 | 152.42 |
| E | Y＝2.8148x+4.9671 | 0.9909 | 1.0352 | 158.32 | 68.51 | 231.09 |
| F | Y＝1.8460x+4.8000 | 0.9890 | 1.2833 | 127.71 | 73.13 | 174.63 |
| G | Y＝1.9043x+4.8342 | 0.9974 | 1.2220 | 134.11 | 78.40 | 171.06 |
As can be seen from the experiments, the co-toxicity coefficients of treatment C, D, E, F, G were: 145.12, 152.42, 231.09, 174.63 and 171.06 which are all more than 120 have synergistic effect, particularly the maximum co-toxicity coefficient of treatment E is 231.09, the optimal mixing ratio of pyriminobac-methyl and mesotrione is 3:5, and the synergistic effect is remarkable.
(2) The optimal mixing of pyriminobac-methyl and mesotrione and the combined action of bensulfuron methyl:
respectively setting 5 doses of the mesotrione-mesotrione mixed agent, the single bensulfuron methyl agent and 5 mixed preparations (in the group C, the mass ratio of the mesotrione-mesotrione mixed agent to the single bensulfuron methyl agent is 9:1, and the mass ratio of the mesotrione to the mesotrione in the mesotrione-mesotrione mixed agent is 3:5), setting blank controls, and repeating the treatment for 4 times in each test. The treatment doses are detailed in table 4.
TABLE 4 test treatment and test levels (concentration ga.i./667 m)2)
The combined action of the optimum pyriminobac-sodium mesotrione blending and bensulfuron-methyl is shown in table 5 below (the control effect in the table is the average of four data, and the test method is the same as above):
TABLE 5 fresh weight control Effect of the mixture of pyriminobac-methyl, mesotrione and bensulfuron methyl on weeds
From Table 5, the toxic action and control effect of the agent on weeds were confirmed. And calculating respective virulence regression equation, LD50, actual virulence index, theoretical virulence index and cotoxicity coefficient by a formula. Are shown in Table 6.
TABLE 6 indoor toxicity and combined action of pyriminobac-methyl, mesotrione and bensulfuron methyl on weeds in different mixing ratios
| Treatment of | Regression equation | Correlation coefficient | LD50 | Actual virulence index | Theoretical virulence index | Co-toxicity coefficient |
| A | Y＝1.6093x+4.8880 | 0.9977 | 1.1737 | 212.11 | / | / |
| B | Y＝1.7299x+4.8880 | 0.9848 | 2.4895 | 100 | / | / |
| C | Y＝1.5673x+4.8880 | 0.9944 | 1.3875 | 179.42 | 142.04 | 126.32 |
| D | Y＝1.5509x+4.8880 | 0.9983 | 1.2927 | 192.58 | 156.06 | 123.40 |
| E | Y＝2.0807x+4.8880 | 0.9970 | 0.8690 | 286.48 | 170.07 | 168.45 |
| F | Y＝1.6911x+4.8880 | 0.9986 | 0.9401 | 264.81 | 184.08 | 143.86 |
| G | Y＝1.7917x+4.8880 | 0.9983 | 0.9939 | 250.47 | 198.10 | 126.44 |
Experiments show that the co-toxicity coefficients of C, D, E, F, G treated by the method are respectively 126.32, 123.40, 168.45, 143.86 and 126.44, the co-toxicity coefficients are all larger than 120, the synergistic effect is achieved, and particularly the co-toxicity coefficients of E and F are the largest, and the remarkable synergistic effect is achieved.
Tests show that the three active ingredients of pyriminobac-methyl, mesotrione and bensulfuron methyl are compounded according to the weight ratio of 2.6-3.4:4.3-5.7:1-5, so that the herbicide has an obvious synergistic effect on annual monocotyledonous and dicotyledonous weeds; wherein the pyriminobac-methyl, mesotrione and bensulfuron-methyl have better effects at a ratio of 2.6-2.8:4.3-4.7:4-5, and the co-toxicity coefficients of 3:5:3 and 2.8:4.7:4 (for meeting the matching requirement in the field of pesticides, also can be 5.6:9.4:8) are more ideal, so that the weeding effect is best.
Example 8 safety indoor assay report of treatment of leaves and leaves of Pyriminobac-sodium mesotrione bensulfuron on Rice
Under the greenhouse condition, a pot experiment method is adopted to research the safety of ternary compound stem and leaf treatment of the pyriminobac-sodium, mesotrione and bensulfuron methyl on rice, and a scientific basis is provided for reasonable mixing of the pyriminobac-sodium, the mesotrione and the bensulfuron methyl.
Zhendao No. 18 as a kind of rice to be tested
The weed Euphorbia lathyris L, Echinochlorus crusgalli L, Echinochloroacrgalli (L.) Beauv, Arthropoda japonica (Rotalalinica (Willd.) Koehne.) Scirpus (Scirpus validus Vahl), Arctium short (Sagittaria pygmaea Miq), and Cyperus difformis L (Cyperus difformis L.) were tested (seeds were harvested in the field in the last year, and the germination rate was 85% or more).
The test agent is 97% pyriminobac-sodium original drug (chemical plant of Suzhou city, Anhui province); 98% mesotrione technical (Zhejiang grass science ltd); 97% bensulfuron (Shandong Weifang Runfeng chemical Co., Ltd.).
Weighing quantitative raw medicine with electronic balance, adding appropriate amount of emulsifier, dissolving with acetone, and diluting with 0.1% Tween 80 water solution to desired concentration.
Spraying the stems and leaves of the rice at the 3-leaf stage and the 2-4-leaf stage of the weeds for 1 time. After the application, the existence of phytotoxicity symptoms of the treated rice is investigated, if yes, the phytotoxicity symptoms and the grade are recorded in detail, and the fresh weight of the treated rice is measured 20 days after the application, and the fresh weight inhibition rate is calculated to clearly test the safety of the pesticide on the rice. After the application, the damage symptoms (such as growth inhibition, chlorosis, deformity and the like) of the weeds are recorded in detail, and 20 days after the application, the fresh weight of the overground part of each treated weed is weighed, and the fresh weight control effect of the weeds is calculated.
DPS software is used for carrying out regression analysis on the logarithm value of the medicament dose and the probability value of the fresh weight inhibition rate of the rice, calculating a correlation coefficient and the dose ED when the crop is inhibited by 10 percent10And 90% ED90 for weed suppression, and the selectivity index was calculated.
Selectivity index ED10/ED90
When observed 5 days after application, when part of rice treated with the 11% pyriminobac-sodium mesotrione bensulfuron dispersible oil suspension prepared in example 4 at a high concentration of 8000mg/kg (4 times of the recommended dose) is albino, the plant height is normal, and the growth vigor of the rice treated with the recommended dose and the dose which is the same as the recommended dose is normal, the rice treated with the suspension is not obviously different from that treated with a blank control.
TABLE 7 visual evaluation criteria for herbicidal Activity and crop safety
TABLE 8 inhibition of 11% pyriminobac-methyl mesotrione bensulfuron dispersible oil suspension on rice
TABLE 9 fresh weight control of 11% pyriminobac-methyl, mesotrione, bensulfuron-methyl, dispersible oil suspension on weeds
As can be seen from Table 9, the toxicity regression equation, LD50, of the herbicide on weeds and the control effect are calculated by the formula and are listed in Table 10.
TABLE 10 regression equation of virulence and LD50
| Treatment of | Regression equation | Correlation coefficient | LD50 | 95% confidence interval |
| A | Y＝3.2930x-0.3186 | 0.9987 | 41.2219 | 39.2006-43.3475 |
As can be seen from Table 10, the 11% pyriminobac-sodium mesotrione bensulfuron dispersible oil suspending agent has LD50 of 41.2219 and 95% confidence interval of 39.2006-43.3475.
From tables 8 and 9, ED 10-419.3251 for 10% inhibition of rice growth, ED 90-100.9953 for 90% inhibition of weed growth, and selectivity coefficient 419.3251/100.995-4.18 >2 were found by DPS software, and it was considered that this agent had a significant selectivity and was safe for rice.
Example 9 field efficacy test
The field efficacy test of 2 years shows that in the 3-5 leaf period of rice and the 1-5 leaf period of weeds, the 11% pyriminobac-sodium mesotrione bensulfuron dispersible oil suspension agent prepared in the embodiment 4 of the invention has the effective component dosage of 2, 4, 6 and 8 g/mu, is mixed with water for 40 kg/mu for spraying, the rice safety and weed control effect are visually observed in 10, 30 days and the mature period, the control effects are measured in 10 and 30 days, and the results are as shown in Table 11:
TABLE 11 weed control test results
Note that the data in the white control group in the table are the number of plants, and the other data for treatment are control effect (%)
By visual inspection, the rice is safe to the rice because no phytotoxicity symptom is observed from the application to the mature period. The weed control effect of 6 g/mu reaches more than 80% in 10 days, the weed control effect of 30 days reaches more than 95%, the control effect is obviously enhanced along with the increase of the dosage, the good weed control effect can be achieved in the paddy field of 6 g/mu, compared with the single use of one of the effective components, the weed control spectrum is expanded, and the weed control composition has obvious synergistic effect on gramineae, broad leaves and nutgrass flatsedge. The herbicide can control weeds in the whole growth period of crops by once application, has obvious weeding effect, is environment-friendly, has no influence on next-stubble crops, has small pollution to the environment, is safe to people, livestock, birds and beneficial organisms, and is beneficial to keeping ecological balance. In addition, the herbicide is processed by a physical method, the production process is simple, three wastes are not discharged in the production process, and no adverse effect is caused on the ecological environment. Is a compound herbicide with ideal control effect at present.
Comparative example 1
With respect to prior art application No. CN103392722A, which discloses a combination of bensulfuron methyl and pyriminobac-methyl, the applicant conducted the following experiments:
experimental materials: the weed Euphorbia lathyris L (European), Echinochlorus crusgalli L (L.), Echinochlorus rugova (L.), Belauv), Arthropoda japonica (Rotalainica (Willd.) Koehne.), Scirpus validus Vahl, Arrowland arrowhead (Sagittaria pygmaea Miq), Cyperus difformis L (Cyperus difformis L.) were tested (seeds were harvested in the field in the last year, the germination rate was more than 85%).
Reagent to be tested: 97% pyriminobac-methyl technical material (chemical plant of Suzhou city, Anhui province); 97% bensulfuron (Shandong Weifang Runfeng chemical Co., Ltd.).
Calculating method and judging standard:
test results the combined action type after the mixture is evaluated by the co-toxicity coefficient method of the Sun Yunpei. And calculating the actual virulence index, the mixed agent theoretical virulence index and the cotoxicity coefficient according to the SUN, Y-P (Sun cloud Peel) method. And solving a regression equation by taking the logarithm of the concentration as X and the pest control efficiency value as Y.
Actual virulence index is LD50 × 100 for standard medicament LD 50/cocktail;
theoretical virulence index ═ Σ (virulence index of the test agent x the percentage of active ingredient of the agent in the mixture);
the co-toxicity coefficient is the actual toxicity index/theoretical toxicity index of the mixed preparation multiplied by 100;
and (3) judging standard: the co-toxicity coefficient is less than 80, the antagonism is the addition effect between 80 and 120, and the synergy is more than 120.
(1) Calculation of co-toxicity coefficient of bensulfuron methyl and pyriminobac-methyl
Weighing quantitative raw medicine with electronic balance, adding appropriate amount of emulsifier, dissolving with acetone, and diluting with 0.1% Tween 80 water solution to desired concentration.
Combined action of bensulfuron methyl and pyriminobac-methyl
5 doses of bensulfuron-methyl, pyriminobac-methyl single agent and 5 mixed preparations of bensulfuron-methyl and pyriminobac-methyl are respectively set, blank controls are additionally set, and each test treatment is repeated for 4 times. The treatment doses are detailed in table 12.
TABLE 12 Experimental treatment groups (amount ga.i/667 m)2)
Spraying the stems and leaves of the rice in the 3-leaf stage and the 2-4-leaf stage of the weeds. The test was carried out by spraying the drug 1 time on 09/08 days in 2019. After the application, the damage symptoms of the rice and the weeds are recorded in detail, and 20d after the application, fresh weight measurement is carried out and compared with control treatment, and the fresh weight control effect is calculated. The combined action of bensulfuron-methyl and pyriminobac-methyl is shown in the following table (the control effect in the above table is an average of four data):
TABLE 13 fresh weight control of weeds 20 days after bensulfuron methyl and pyriminobac-methyl were mixed
As can be seen from table 13: the drug has the toxic action and the control effect on weeds. Calculating respective virulence regression by formula
Equation, LD50, actual virulence index, theoretical virulence index, and cotoxicity coefficient. Are shown in Table 14.
TABLE 14 Combined action of the combination of bensulfuron methyl and pyriminobac-methyl on weeds
From the above test results, the co-toxicity coefficients of treatment C, D, E, G were: 98.6, 81.3, 96.0, 76.0 and 99.5, which are additive effects, and the F co-toxicity coefficient is 76.0, which has smaller antagonism.
(2) Bensulfuron methyl and pyriminobac-methyl field efficacy test
0.5 percent bensulfuron-methyl pyriminobac-methyl granules (the ratio is 1:1) are applied to the rice in the 3-5 leaf period and the weeds in the 1-5 leaf period, the safety and the weed control effect of the rice are visually observed in 10 and 30 days and the mature period, and the control effects are measured in 10 and 30 days, and the results are shown in the following table.
TABLE 15 results of bensulfuron methyl and pyriminobac-methyl granules on weed control
Note: in the table, the data in the white control group is the number of plants, and the other data in each treatment is the control effect (%)
From the above data it can be seen that: when the 0.5% bensulfuron methyl pyriminobac-methyl granules (the ratio is 1:1) are applied to rice in the 3-5 leaf period and the 1-5 leaf unequal period of weeds, the control effect on target weeds is lower than 5% under the dosage of 20 g/mu and 40 g/mu of preparations, the control effect is not more than 40% under the dosage of 80 g/mu and 1600 g/mu of preparations, the control effect is poor, and particularly, the granules have no control effect on malignant weeds such as moleplant seeds, allium mongolicum regel, rhizoma pleionis and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The rice weeding composition containing pyriminobac-methyl, mesotrione and bensulfuron-methyl is characterized in that the active ingredients of the rice weeding composition are pyriminobac-methyl, mesotrione and bensulfuron-methyl, and the weight ratio of the pyriminobac-methyl, the mesotrione and the bensulfuron-methyl is 2.6-2.8:4.3-4.7: 4-5.
2. A rice herbicidal composition as claimed in claim 1, wherein the weight ratio of pyriminobac-methyl, mesotrione and bensulfuron-methyl is 2.8:4.7: 4.
3. The rice weeding composition according to claim 1, wherein the sum of the mass of pyriminobac-methyl, mesotrione and bensulfuron methyl is 0.5-85% of the total mass of the weeding composition.
4. The rice weeding composition according to claim 1, wherein the formulation of the rice weeding composition is a suspending agent, a suspoemulsion, an emulsifiable concentrate, a microemulsion, an aqueous emulsion, a wettable powder or a water dispersible granule.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090298691A1 (en) * | 2008-04-25 | 2009-12-03 | Koschnick Tyler J | Methods and compositions for control of aquatic weeds using herbicidal combinations with fluridone |
| CN101595886A (en) * | 2009-07-10 | 2009-12-09 | 合肥星宇化学有限责任公司 | The Herbicidal combinations that is used for paddy field |
| CN102293202A (en) * | 2011-09-27 | 2011-12-28 | 湖南振农科技有限公司 | Omnibearing herbicide for paddy fields |
| CN103392722A (en) * | 2013-06-30 | 2013-11-20 | 广东中迅农科股份有限公司 | Weeding composition containing bensulfuron methyl and pyriminobac-methyl |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103960254B (en) * | 2014-04-08 | 2016-05-18 | 广东中迅农科股份有限公司 | A kind of Herbicidal combinations that contains mesotrione |
| CN104322529A (en) * | 2014-10-08 | 2015-02-04 | 江苏东宝农药化工有限公司 | Weed killer composition having broad spectrum weed killing effect |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090298691A1 (en) * | 2008-04-25 | 2009-12-03 | Koschnick Tyler J | Methods and compositions for control of aquatic weeds using herbicidal combinations with fluridone |
| CN101595886A (en) * | 2009-07-10 | 2009-12-09 | 合肥星宇化学有限责任公司 | The Herbicidal combinations that is used for paddy field |
| CN102293202A (en) * | 2011-09-27 | 2011-12-28 | 湖南振农科技有限公司 | Omnibearing herbicide for paddy fields |
| CN103392722A (en) * | 2013-06-30 | 2013-11-20 | 广东中迅农科股份有限公司 | Weeding composition containing bensulfuron methyl and pyriminobac-methyl |
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