CN102239849A - Sterilization composition containing fenoxanil and propiconazole - Google Patents
Sterilization composition containing fenoxanil and propiconazole Download PDFInfo
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- CN102239849A CN102239849A CN2010101834587A CN201010183458A CN102239849A CN 102239849 A CN102239849 A CN 102239849A CN 2010101834587 A CN2010101834587 A CN 2010101834587A CN 201010183458 A CN201010183458 A CN 201010183458A CN 102239849 A CN102239849 A CN 102239849A
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Abstract
The invention discloses a sterilization composition containing fenoxanil and propiconazole, a preparation method and an application thereof. The sterilization composition is characterized in that: the sterilization composition comprises the fenoxanil, the propiconazole and other assistant agents, wherein a weight ratio of the fenoxanil to the propiconazole is 50:1-1:60. The sterilization composition provided by the present invention can be applicable for prevention of rice blast, and has characteristics of low cost and good effect. In addition, a mixed composition containing the fenoxanil and the propiconazole is not reported at home and abroad, therefore, the sterilization composition containing the fenoxanil and the propiconazole is provided by the present invention.
Description
Technical field
The invention belongs to the agriculture chemical compounding field, relate to a kind of bactericidal composition and uses thereof, especially a kind of is the bactericidal composition and the application thereof of main active with rice blast acid amides and propiconazole.
Background technology
Using chemical agent is the most effectively means of controlling plant diseases.But long-term use single chemical bactericide continuously high dose, cause problems such as residual, the environmental pollution of medicament and anti-pesticide resistance fungi development easily.Reasonably chemical bactericide is composite or be mixed and have the expansion fungicidal spectrum, improve control efficiency, prolong the optimum period for applying fertilizer, reduce dosage, reduce poisoning, reduce residual, delay fungi drug resistance and positive characteristics such as drug-fast generation and development, bactericide compounded is one of the effective method the most that addresses the above problem.Exploitation new product bactericide price is constantly soaring, and by contrast, exploitation is efficient with research, low toxicity, low-residual composite be mixed have small investment, the lead time is short and be subjected to domestic and international attention, strengthens the development dynamics one after another.
Rice blast acid amides (fenoxanil):
Have another name called zarilamid, its chemistry N-(1-cyano group 1,2-dimethyl) by name-2-(2, the 4-dichlorophenoxy) propionamide, it has novel mechanism of action, belongs to the melanin biosynthesis inhibitor, rice blast there is good preventive effect, in agricultural production, uses extensively.The rice blast acid amides belongs to amide-type low toxicity bactericide, is mainly used in the control of rice blast.By the end of in by the end of May, 2008, have 7 products and register totally 4 of former medicine products in China, be respectively: the registration in 2002 of German BASF AG, Fengdeng Pesticide Co., Ltd., Jiangsu's registration in 2007, the registration in 2008 of Jiangsu Changqing Agricultural Chemistry Co., Ltd. and Shandong Jingbo Agrochemicals Ltd..Totally 3 of formulation products (being 20% suspending agent) are respectively: the registration in 2002 of German BASF AG, the registration in 2008 of Fengdeng Pesticide Co., Ltd., Jiangsu and Shandong Jingbo Agrochemicals Ltd..
Propiconazole:
Former medicine is yellow, tasteless, thick liquid, 180 ℃/0.1mmHg of boiling point, vapour pressure 56 μ Pa (25 ℃), density 1.29 (20 ℃), KowlogP=3.72 (pH6.6,25 ℃), solvability water 100mg/L (20 ℃), n-hexane 47g/L stablizes below 320 ℃ with ethanol, acetone, toluene and n-octyl alcohol are fully miscible, not facile hydrolysis.It is a kind of systemic fungicide with protection and therapeutic action; can be absorbed by root, stem, leaf portion; and can be soon in the plant body on conduction; propiconazole can be prevented and treated sac fungi, and the caused disease of basidiomycetes and imperfect fungus is particularly to root rotof flax; powdery mildew; bakanae disease of rice has the better prevention effect, but invalid to the oomycetes disease, and the third ring phosphorus longevity of residure is about one month.
Rice blast: claim rice blast again, burn pest, the pest of kowtowing.Be distributed in each rice district, the whole nation, the blade of mainly causing harm, stem stalk, fringe portion.Because harmful period, position difference are divided into seedling pest, leaf pest, joint pest, panicle blast, grain pest.Before the seedling pest betide three leaves, due to seed-borne fungi.Sick seedling base portion is greyish black, and the top browning is crispaturaed and dead, and disease portion produced the mould layer of a large amount of grey blacks, i.e. pathogen conidiophore and conidium when humidity was big.The leaf pest can both take place in whole growing.Tillering, it is heavier to cause harm to the shooting stage.Because weather conditions are different with variety resistance, scab is divided into four types.The chronic type scab begins to produce the dirty-green stigma on leaf, and flaring is shuttle dish spot greatly, and the downright bad line of brown of extension is often arranged.Scab central authorities canescence, the edge brown has faint yellow haloing outward, and blade back has the mould layer of grey, and scab forms irregular big spot more in flakes, and this scab development is slower.The acute scab forms dirty-green subcircular or oval scab on susceptible variety, the blade two sides all produces the mould layer of brown, changes the chronic type scab during morbidity of condition incompatibility into.After the susceptible tender leaf of white point type scab is fallen ill, produce white subcircular stigma, do not produce spore, when sharp its of weather conditions expanded, can transfer the acute scab to.Brown some type scab is many on anti-kind of height or Lao Ye, and the brown point that produces the needle point size only results between vein, less product spore, and this disease also can be fallen ill at positions such as the tip of a leaf, auricle, pulvinus.Be everlasting heading back of joint temperature takes place, and just produces the brown point on the rice joint, after gradually around the joint expansion, make the blackening of disease portion, frangibility.The withered dead ears of formation early take place.Only cause the bending of stem stalk what a side took place.Panicle blast just forms the brown point, makes fringe neck browning after putting exhibition, also causes withered dead ears.The not plump paddy of causing that falls ill evening.Branch stalk or cob are injured and are caused small ear unreal.The grain pest produce the oval or irregular spot of brown, can make the paddy blackening.The clever shell that has is asymptomatic, and the sterile lemma browning of being injured makes seed-borne fungi.
Summary of the invention
The objective of the invention is at the problems referred to above,, thereby provide a kind of bactericidal composition of preventing and treating the rice blast disease for pesticide resistance, enhancing drug effect, the reduction drug cost that overcomes and delay existing agricultural chemicals.
A further object of the invention provides the purposes of this bactericidal composition.
Measure of the present invention realizes by following measures.
A kind of bactericidal composition, it contains rice blast acid amides and propiconazole, and wherein the weight ratio of rice blast acid amides and propiconazole is 50: 1～1: 60.
Described bactericidal composition, wherein the more excellent weight ratio of rice blast acid amides and propiconazole is 30: 1～1: 20.
Described bactericidal composition, wherein to accumulate the weight ratio of shared preparation be 2～61% to two kinds of active principles of rice blast acid amides and propiconazole.
Described bactericidal composition, rice blast acid amides and propiconazole and auxiliary agent, carrier etc. are processed into any one formulation that allows on the agricultural chemicals.
Described bactericidal composition is characterized in that the formulation that can be processed into is suspending agent, aqueous emulsion, microemulsion, wetting powder, water dispersible granules and microcapsule formulations etc.
Described bactericidal composition is used to prevent and treat multiple fungal diseases such as rice blast, banded sclerotial blight.
Microbicide compositions with synergistic effect takes following measure to realize:
One of technical scheme of the present invention, described bactericidal composition are suspending agent, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Dispersant 5～20%
Antifreezing agent 0.5～3%
Thickener 0.1～2%
Defoamer 0.1～0.8%
Water surplus
The concrete production stage of this bactericidal composition suspending agent is earlier other auxiliary agents to be mixed, mix through high speed shear, add rice blast acid amides and propiconazole, abrading-ball is 2～3 hours in ball crusher, make a diameter all below 5mm, make the suspending agent preparation that contains the bactericidal composition of rice blast acid amides and propiconazole of the present invention.
Two of technical scheme of the present invention, described bactericidal composition are aqueous emulsion, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Emulsifier 3～30%
Solvent 5～15%
Stabilizing agent 2～15%
Antifreezing agent 1～5%
Defoamer 0.1～8%
Thickener 0.2～2%
Water surplus
The concrete production stage of this bactericidal composition aqueous emulsion is: at first former medicine rice blast acid amides is added with propiconazole, solvent and emulsifier, cosolvent and be in the same place, make and be dissolved into uniform oil phase; With part water, antifreeze, other insecticides adjuvant such as antimicrobial mixes into uniform water; When the reactor high speed stirs, oil phase is added water, slowly add water, open clipper and carry out high speed shear, and add remaining water, shear half an hour approximately, form the aqueous emulsion of oil-in-water type until reaching the phase inversion point.Promptly make the aqueous emulsion of the bactericidal composition that contains rice blast acid amides and propiconazole.
Three of technical scheme of the present invention, described bactericidal composition are microemulsion, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Solvent 1～30%
Emulsifier 3～30%
Stabilizing agent 2～15%
Synergist 2～10%
Water 10～78%
The concrete procedure of processing of this bactericidal composition microemulsion is: rice blast acid amides and propiconazole are added in the solvent, add auxiliary agents such as emulsifier, stabilizing agent and synergist while stirring, at last it is added in the entry and stir, form transparent and homogeneous liquid, promptly get the microemulsion of the present composition.
Four of technical scheme of the present invention, described bactericidal composition are wetting powder, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Dispersant 3～20%
Wetting agent 3～10%
Filler 10～70%
The concrete procedure of processing of this bactericidal composition wetting powder is: press above-mentioned prescription with rice blast acid amides and propiconazole and dispersant, wetting agent and filler mixing, in stirred tank, evenly stir, behind airslide disintegrating mill, mixing, promptly can be made into the wetting powder of the present composition.
Five of technical scheme of the present invention, described bactericidal composition are water dispersible granules, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Dispersant 3～20%
Wetting agent 3～10%
Disintegrant 2～5%
Filler 10～70%
The concrete procedure of processing of this bactericidal composition water dispersible granules is: by above-mentioned prescription rice blast acid amides, propiconazole and dispersant, wetting agent, disintegrant and filler are mixed, pulverize with micro jet, through mediating, add then and carry out granulation, drying, screening in the fluidized bed prilling dryer after sample analysis makes the water dispersible granules that contains the bactericidal composition of rice blast acid amides and propiconazole of the present invention.
Six of technical scheme of the present invention, described bactericidal composition are microcapsule formulations, and the percentage by weight of component is:
Rice blast acid amides 1～50%
Propiconazole 1～60%
Urea 5～20%
Formaldehyde 5～20%
Emulsifying dispersant 5～20%
Antifreezing agent 1～5%
Thickener 0.1～2%
Defoamer 0.1～0.8%
Water surplus
This bactericidal composition microcapsule formulations procedure of processing is: add urea and formaldehyde (amount of substance ratio be about 1: 1.5～2.0) in the there-necked flask of agitating device is housed, about pH value to 8～9 with the sodium hydroxide solution regulator solution, be warming up to 70～80 ℃ then, reaction obtains stable urea resin prepolymer.The former medicine of getting a certain amount of rice blast acid amides and propiconazole is dissolved in the cyclohexane, and adds emulsifying dispersant in solution, follows vigorous stirring, and being made into the aqueous solution that contains emulsifying dispersant is the O/W type stable emulsion of water.Above-mentioned urea resin prepolymer is added in the emulsion, regulate the pH value, polymerization reaction take place under the acid catalysis condition is wrapped oil phase substance, forms microcapsule granule.Slowly heat up, solidify, temperature is controlled at 40～50 ℃, hardening time 1h.Select to add an amount of auxiliary agent, the microcapsule suspending agent that gets final product stablely.
Described emulsifier is selected from any one or more mixtures formed with arbitrary proportion in calcium dodecyl benzene sulfonate and aliphatic acid polyethenoxy ether, alkylphenol polyoxyethylene sulfosuccinate, styryl phenol APEO, polyoxyethylene nonylphenol ether, castor oil polyoxyethylene ether, aliphatic acid polyethenoxy base ester, the polyoxyethylene aliphatic alcohol ether.
Described dispersant is selected from one or more in polycarboxylate, sodium lignin sulfonate, alkylphenol polyoxyethylene formaldehyde condensation products sulphate, alkyl benzene sulfonate calcium salt, naphthalene sulfonic acid-formaldehyde condensation product sodium salt, alkylphenol polyoxyethylene, aliphatic acid polyethenoxy ether, polyoxyethylene carboxylate, the fatty acid glyceride APEO.
Described solvent is any one or more mixed solvents formed with arbitrary proportion in dimethylbenzene or biodiesel, toluene, diesel oil, methyl alcohol, ethanol, n-butanol, isopropyl alcohol, turpentine oil, solvent naphtha, dimethyl formamide, dimethyl sulfoxide (DMSO), the water equal solvent.
Described wetting agent is selected from: one or more in lauryl sodium sulfate, calcium dodecyl benzene sulfonate, Nekal BX, wetting and penetrating agent F, alkylnaphthalene sulfonate, alkylphenol ethoxylate, polyoxyethylene triphenylethylene phosphenylic acid salt, spaonin powder, silkworm excrement, the soapberry powder.
Described synergist is meant to have the medicament of enhancing penetration, wetting extended capability, knock down insect speed, improve the resistance of rainwater washing against power of agricultural chemicals, thereby improve a class safety, environmental protection of agricultural insecticide, bactericidal effect, the New-type adjuvant of nontoxic, noresidue, optional in organic silicon pesticide synergist ZC-650 or organic silicon pesticide bleeding agent spreading agent Agrowet810c, agricultural organic silicon pesticide synergist Silwet408, azone any.
Described disintegrant is selected from: one or more in bentonite, urea, ammonium sulfate, aluminium chloride, citric acid, succinic acid, the sodium bicarbonate.
Described thickener is selected from: one or more in xanthans, CMC, hydroxyethylcellulose, methylcellulose, Magnesiumaluminumsilicate, the polyvinyl alcohol.
Described antimicrobial is selected from: one or both in Sodium Benzoate, sodium salicylate, the sodium sorbate.
Described stabilizing agent is selected from: a kind of in sodium citrate, the resorcinol.
Described antifreeze is selected from: one or more in ethylene glycol, propane diols, glycerine, diethylene glycol (DEG), the triethylene glycol.
Described defoamer is selected from: silicone oil, silicone compound, C
10-20Saturated fat acid compounds, C
8-10In aliphatic alcohols compound and the polyoxyethylene glycerol ether one or more.
Described emulsifying dispersant comprises: wetting agent, dispersant, stabilizing agent, thickener, defoamer and antifreezing agent etc.
Described filler is selected from: one or more in kaolin, diatomite, bentonite, attapulgite, white carbon, starch, the precipitated calcium carbonate.
The invention has the beneficial effects as follows:
1, the used rice blast acid amides of the present invention is a synthetic inhibitor, and propiconazole is the triazole bactericidal agent with interior absorption, has very strong treatment and protective effect; the two mechanism of action difference, being mixed mutually can not produce conflict, but Synergistic; reduce dosage, reduce cost.At present rice blast acid amides and propiconazole composite do not have report as yet.
2, two kinds of composite bactericide have double action mechanism, delay the drug-fast generation of germ.
3, reduced the agricultural chemicals usage amount, strengthened friendly environment.
Embodiment
Further the present invention is made an explanation by following examples, but can not limit the scope of the invention.
1 materials and methods
1.1 test material
1.1.1 reagent agent
The former medicine of 95% rice blast acid amides, Wuhan close the long-range development in science and technology of mesophytization Co., Ltd and produce; 95% propiconazole crude oil, Taicang, Jiangsu Co., Ltd of insecticide factory produces;
1.1.2 for the examination pathogen
Rice blast fungus, the rice blast leaf of gathering from Guizhou adopts the conventional organization partition method to obtain bacterial strain, cultivates on the PDA medium behind the purifying.
1.1.3 for the examination medium
PDA medium: potato 200g, glucose 20g, agar 20g, water 1000ml
Pyricularia oryzae produces the spore medium: add 200g tomato juice/L in above-mentioned PDA medium, transfer PH to 7.0.
1.2 test method and synergistic effect are measured
1.2.1 single agent toxicity test
1.2.1.1 soup preparation
The former medicinal proper amount of acetone dissolving of 95% rice blast acid amides, 95% propiconazole crude oil is dissolution with solvents with dimethyl formamide (DMF), is made into 1000 μ g/ml mother liquors respectively, the Tween solution with 0.1% Tween solution is diluted to 5～6 concentration gradients with mother liquor again.
1.2.1.2 spore germination method toxicity test.
At first prepare spore suspension, have to cultivation to add an amount of sterile water on the product spore medium of Pyricularia oryzae, gently brush with writing brush, microscopically is observed, under the low power lens about 100 spores in every visual field.
Secondly from the low concentration to the high concentration, draw 60 microlitre soups successively with liquid-transfering gun and add respectively in the small test tube, draw spore suspension 60 microlitres then, make soup and spore suspension mixed in equal amounts even.Draw 30 microlitre mixed liquors with liquid-transfering gun and drip on the slide that has the fine jade film-making, frame is put in the big culture dish that has shoaling layer, adds a cover and places 28 ℃, and the mold incubator of RH80% is cultivated 20～24h.Every processing repeats 4 times, compares with the spore suspension of adding medicine not.
1.2.1.3 data statistic analysis
When the blank spore germination rate reaches 90% when above, check the spore germination situation of respectively handling.
Every processing repeats 3 visuals field of random observation, about 200 spores of every processing investigation, writes down sprouting number and spore sum respectively with counter.
Concentration logarithm value with reagent agent is an independent variable, is dependent variable with spore germination relative inhibition probit value, carries out the data analysis statistics with the DPS data handling system, obtains virulence regression equation, EC50 value and correlation coefficient.
Spore germ tube length is considered as sprouting greater than the spore radius.
Spore germination rate=(spore germination number/investigation spore sum) * 100
Handle and correct spore germination rate=(handling spore germination rate/blank spore germination rate) * 100
Spore germination relative inhibition=(handle and correct spore germination rate/blank spore germination rate) * 100
On the basis of preliminary experiment, respectively single agent rice blast acid amides and propiconazole are carried out toxicity test in order to last method, the two EC
50Value is respectively 1.02mg/l and 9.87mg/l.
Combination is provided with 1.2.2 be mixed
20% rice blast acid amides propiconazole mass ratio was respectively 1: 1,1: 3,1: 5,1: 7,1: 9, i.e. 10%+10%, 5%+15%, 3.33%+16.67%, 2.5%+17.5%, 2%+18% totally 5 combinations that are mixed.
1.2.3 mixture toxicity test
Carry out the toxicity test of mixture according to mixed ratio with single agent toxicity test method.
EC that each that will measure according to the abundant method of Sun Yun handled
50Value is converted into the actual toxicity index (ATI) of using with; According to the proportioning of mixture, obtain theory and use toxicity index (TTI) with, calculate the co-toxicity coefficient (CTC) of mixture by following formula.
Single agent toxicity index=(standard medicament EC
50/ reagent agent EC
50) * 100
ATI=(standard medicament EC
50/ reagent agent (using with) EC
50) * 100
The content (%) of toxicity index * B in using with of content (the %)+B of toxicity index * A of TII=A in using with
CTC＝(ATI/TTI)×100
If co-toxicity coefficient is big by 120, showing has synergistic effect; If be starkly lower than 100 (below 80), be indicated as antagonism; Between 100～120, be indicated as summation action
Data see Table 1
The different proportioning rice blast of table 1 acid amides propiconazole mixture is to the virulence and the synergistic effect of Rhizoctonia solani Kuhn
Table 2 rice blast acid amides and propiconazole compound are to the co-toxicity of Rhizoctonia solani Kuhn
2 results and analysis
According to bactericide joint toxicity measuring result, rice blast acid amides and propiconazole mass ratio are that the co-toxicity coefficient of 1: 3 and 1: 5 o'clock is respectively 131.2 and 128.3, obviously big by 120, show as synergistic effect, comprehensive synergistic effect and reagent cost think that rice blast acid amides and propiconazole mass ratio are best proportioning at 1: 3.
3 field trials are measured the control efficiency to rice blast and rice sheath blight disease
3.1 field trial is measured the control efficiency to rice blast
3.1.1 application method
Test dispenser twice altogether, check plot spray equivalent clear water.When making up a prescription, after with low amounts of water medicament fully being dissolved earlier, add the suitable quantity of water processing of comprehensively spraying again, even spraying sprays rice strain middle and lower part emphatically.All adopting power driven sprayer, operating pressure during the spray medicine is 2.0～2.3kg/cm
2, shower nozzle aperture 1.2mm.The sub-district spouting liquid is used by 675 liters/hectare, and soup is sprayed application to the positive and negative two sides of crop leaf uniformly.
3.1.2 investigation method
3.1.2.1 leaf pest investigation method
Experimental field be located at the Hunan paddy field, the field of selecting the more consistent leaf seasonal febrile diseases of growing way their early stage is for experimental field, and middle fertility is well-managed.
Every sub-district is got 4 points at random, the whole blades of five strains during investigation, and a situation arises for the statistics disease.
Every leaf writes down total number of sheets, the sick number of sheets at different levels by the percentage classification that scab accounts for leaf area, calculates the blade incidence of disease, disease index, refers to comparison with the contrast disease, calculates relative control effect.
State of an illness grade scale (is unit with the blade)
Sick level victimization state
0 grade: do not have scab on the blade;
1 grade: scab is a syringe needle shape size foxiness;
2 grades: big slightly brown point;
3 grades: circular to oval-shaped grey scab, edge brown, about 1～2 millimeter of scab diameter;
4 grades: typical spindle scab, long 1～2 centimetre, be confined to usually between 2 veins, the area of causing harm is no more than 2% of blade area;
5 grades: typical spindle scab, the area of causing harm is no more than 10% of leaf area;
6 grades: typical spindle scab, the area 10.1～25% of causing harm;
7 grades: typical spindle scab, the area 25.1～50% of causing harm;
8 grades: typical spindle scab, the area 50.1～75% of causing harm;
9 grades: full leaf is withered.
The panicle blast disease tassel yield is estimated grade scale:
Sick level victimization state
0 grade: anosis;
1 grade: disease tassel yield is lower than 1～5%;
3 grades: disease tassel yield is lower than 5.1～10%;
5 grades: disease tassel yield is lower than 10.1～25%;
7 grades: disease tassel yield is lower than 25.1～50%;
9 grades: disease tassel yield is lower than 50.1～100%.
3.1.3 control time and number of times
Leaf pest control times
In the rice tillering intermediary and later stages, leaf blast in rice enters their early stage investigation, investigation disease index before the medicine, and 7 each investigation were once observed its lasting effect in 15 days behind the secondary medicine behind first and second time medicine, investigated altogether 4 times.
Neck pest control times
In paddy stage of yellow ripeness, to investigate after neck seasonal febrile diseases feelings are stable, week back check is once.
Test is investigated 4 times altogether, i.e. disease index investigation before the medicine, preventive effect investigation in 7 days behind the 1st medicine, 7 days and preventive effect investigation in 15 days behind 2 medicines.
3.1.4 drug effect computational methods
Sick leaf rate (the %)=sick number of sheets/investigate total number of sheets * 100
Disease index=∑ (the sick numbers of sheets at different levels * relative level numerical value)/(investigating total number of sheets * 9) * 100
Control efficiency (%)=(1-(disease index behind disease index before the blank district medicine * treatment region medicine)/(disease index before disease index behind the blank district medicine * treatment region medicine)) * 100
3.1.5 poisoning investigation method
Whether continuous 7d range estimation medicament has poisoning to crop after the dispenser.
3.1.6 result of the test and analysis
Each effect of handling the control rice blast sees Table 3
Each handles the effect of control rice blast table 3
Interpretation of result:
As can be seen from Table 3, the effect of 1: 3 the combination control rice blast that is mixed of 20% rice blast acid amides propiconazole is remarkable.Under same every mu of 15 milliliters of consumptions, the effect of complex preparation significantly is better than two kinds of single agent, and its quick-acting and lasting effect are all relatively good, and be the most outstanding with lasting effect especially.Complex preparation significantly is better than effect under the low concentration consumption in control efficiency under the consumption of high concentration.15 days lasting effect is more remarkable after 7 days control efficiency behind the 1st, 2 medicine reaches 70.87% and 75.57%, the 2 medicine respectively, reaches 82.22%.Result of the test proves that 20% rice blast acid amides list agent effect obviously is better than 25% propiconazole list agent.20% rice blast acid amides list agent, preventive effect of 15 days after 7 days the highest control efficiency behind the 1st, 2 medicine is respectively 65.68% and 68.43%, the 2 medicine is 75.26%.And 25% propiconazole list agent, preventive effect of 15 days after 7 days the highest control efficiency behind the 1st, 2 medicine is respectively 62.76% and 65.47%, the 2 medicine is 72.22%.According to field range estimation, in the test dose scope, plant growth is normal, and each is handled medicament and poisoning phenomenon to paddy rice all do not occur, illustrates that it is safe to paddy rice.
3.2 field trial is measured the control efficiency to rice sheath blight disease
3.2.1 application method
Test dispenser twice altogether, check plot spray equivalent clear water.When making up a prescription, after with low amounts of water medicament fully being dissolved earlier, add the suitable quantity of water processing of comprehensively spraying again, even spraying sprays rice strain middle and lower part emphatically.All adopting power driven sprayer, operating pressure during the spray medicine is 2.0～2.3kg/cm
2, shower nozzle aperture 1.2mm.The sub-district spouting liquid is used by 675 liters/hectare, and soup is sprayed application to the positive and negative two sides of crop leaf uniformly.
3.1.2 investigation method
Experimental field be located at the Hunan, publish the medium rice field of course of disease degree for experimental field, soil fertility is medium, and irrigation and drainage are convenient.Adopt the bilinear sampling method, 5 points are got in every sub-district, look into 5 caves at every, and 2 blades in the fixing middle part of every strain fix a point to check during investigation.
Come classification according to the rice sheath blight disease grade scale, write down total strain number, diseased plant number, degree of being in a bad way, calculate diseased plant rate, disease index and preventive effect.
The rice sheath blight disease grade scale is
0 grade: complete stool is anosis;
1 grade: the 4th blade and following each leaf sheath thereof, blade morbidity (is the 1st leaf with sword-like leave);
3 grades: the 3rd blade and following each leaf sheath thereof, blade morbidity;
5 grades: the 2nd blade and following each leaf sheath thereof, blade morbidity;
7 grades: sword-like leave blade and following each leaf sheath thereof, blade morbidity;
9 grades: the complete stool morbidity, withered ahead of time.
3.1.3 control time and number of times
Test is investigated 4 times altogether, i.e. disease index investigation before the medicine, preventive effect investigation in 7 days behind the 1st medicine, 7 days and preventive effect investigation in 15 days behind 2 medicines.
3.1.4 drug effect computational methods
Diseased plant rate (the %)=total strain number of diseased plant number/investigation * 100
Disease index=∑ (diseased plant numbers at different levels * relative level numerical value)/(investigating total strain number * 9) * 100
Control efficiency (%)=(1-(disease index behind disease index before the blank district medicine * treatment region medicine)/(disease index before disease index behind the blank district medicine * treatment region medicine)) * 100
3.1.5 poisoning investigation method
Whether continuous 7d range estimation medicament has poisoning to crop after the dispenser.
3.1.6 result of the test and analysis
Each is handled the effect of preventing and treating rice sheath blight disease and sees Table 4
Each handles the effect of preventing and treating rice sheath blight disease table 4
Interpretation of result:
As can be seen from Table 4, to prevent and treat the effect of rice sheath blight disease remarkable in the combination that is mixed of 20% rice blast acid amides propiconazole 1: 3.Under same 15 milliliters every mu consumption, the effect of complex preparation significantly is better than two kinds of single agent, and its quick-acting and lasting effect are all relatively good, and is the most outstanding with lasting effect especially.Complex preparation significantly is better than effect under the low concentration consumption in control efficiency under the consumption of high concentration.15 days lasting effect is more remarkable after 7 days control efficiency behind the 1st, 2 medicine reaches 73.69% and 80.71%, the 2 medicine respectively, reaches 85.40%.20% rice blast acid amides list agent effect obviously is better than 25% propiconazole list agent.Prevent desirable even more ideal control efficiency at the initial stage of a disease or in advance.
In sum, the present invention contains the sterilization combination of rice blast acid amides and propiconazole, to rice blast and all good control efficiency of Rhizoctonia solani Kuhn, and it is to the target crop safety, compare with single agent, bactericidal composition of the present invention has the advantage that quick-acting is good, the lasting period is long, and environmental pollution is few, is difficult for producing poisoning.So research and development of the present invention and popularization have crucial meaning to society.
Claims (5)
1. bactericidal composition, it is characterized in that: contain two kinds of active components of rice blast acid amides and propiconazole, wherein the weight ratio of rice blast acid amides and propiconazole is 50: 1～1: 60;
2. bactericidal composition according to claim 1 is characterized in that: the more excellent weight ratio of rice blast acid amides and propiconazole is 30: 1～1: 20;
3. bactericidal composition according to claim 1 is characterized in that: the percentage by weight that rice blast acid amides and propiconazole are accumulated shared preparation is 2～61%;
4. bactericidal composition according to claim 1 is characterized in that: rice blast acid amides and propiconazole and auxiliary agent and cosolvent are re-dubbed any one formulation that allows on the agricultural chemicals;
5. bactericidal composition according to claim 1 is characterized in that: the formulation that can be processed into is suspending agent, aqueous emulsion, microemulsion, wetting powder, water dispersible granules and microcapsule formulations etc.;
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101834587A CN102239849A (en) | 2010-05-16 | 2010-05-16 | Sterilization composition containing fenoxanil and propiconazole |
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| CN2010101834587A CN102239849A (en) | 2010-05-16 | 2010-05-16 | Sterilization composition containing fenoxanil and propiconazole |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1675996A (en) * | 1998-07-10 | 2005-10-05 | 日本农药株式会社 | Fungicidal composition for rice crop and plant disease control method for rice crop |
| CN101690483A (en) * | 2009-06-27 | 2010-04-07 | 深圳诺普信农化股份有限公司 | Bactericidal composition containing triazole class compounds |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1675996A (en) * | 1998-07-10 | 2005-10-05 | 日本农药株式会社 | Fungicidal composition for rice crop and plant disease control method for rice crop |
| CN101690483A (en) * | 2009-06-27 | 2010-04-07 | 深圳诺普信农化股份有限公司 | Bactericidal composition containing triazole class compounds |
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