CN105494350A

CN105494350A - Weeding composition

Info

Publication number: CN105494350A
Application number: CN201510966878.5A
Authority: CN
Inventors: 杨会营; 刘晓娇; 田胜; 马嵩岳
Original assignee: Beijing Yanhua Yongle Biotechnology Co Ltd
Current assignee: Yanhua Yongle (Leting) Biological Technology Co. Ltd.
Priority date: 2015-12-21
Filing date: 2015-12-21
Publication date: 2016-04-20

Abstract

The invention belongs to the technical field of pesticide, and discloses a weeding composition. The weeding composition is characterized by comprising two active ingredients of pyribenzoxim and fluroxypyr. The composition is used for preventing and treating annual grassy weed and broad-leaf weed in a paddy field, the synergistic effect is obvious, the weed-controlling spectrum is wide, and the lasting period is long.

Description

A kind of Herbicidal combinations

Technical field

The invention belongs to pesticide field, being specifically related to a kind of is the Herbicidal combinations of active component by pyribenzoxim and fluroxypyr.

Background technology

Pyribenzoxim (Pyribenzoxim) is cauline leaf inorganic agent after wide spectrum selectivity inner sucting conduction type seedling, its mechanism of action is after active component is absorbed by plant stem-leaf, conduct to tender tissue and root in vivo, affect the activity of acetolactate synthestase (ALS), suppress the synthesis of plant branched-chain amino acid, make weeds withered, annual and perennial grassy weed and part broad leaved weed can be prevented and treated.In actual applications, pyribenzoxim is used for preventing and kill off various grassy weed and the part broad leaved weed such as barnyard grass, large fringe amur foxtail.

The fluoro-2-pyridine of amino-3, the 5-bis-chloro-6-of fluroxypyr (fluroxypyr) chemical name: 4--2-pyridine fluoroacetic acid.Fluroxypyr belongs to inner sucting conduction type herbicide after seedling, is absorbed by plants very soon after medicine, makes sensitive plant occur the reaction of classical hormones class weed killer herbicide, plant deformity, distortion.Temperature on the final effect of its weeding without impact, but affect its drug effect play speed.Generally when temperature is low, drug effect plays comparatively slow, stops growing after can making dunsiekte, but dead immediately, and it is very fast dead that temperature raises rear plant.In soil, leaching is not remarkable, and major part is distributed in 0-10 centimetre of topsoil.Fluroxypyr is to Crop securify, do to lose toxicity in conjunction with conjugates in object in resistance, easily degrade in soil, half life period is shorter, poisoning can not be caused to succession crop, the various broad leaved weeds such as clearvers, volume stem knotweed, kitchen garden, black nightshade, chickweed, common vetch, field bindweed, willow leaf thorn knotweed, Amaranthus retroflexus, dayflower, elscholtiza, penny cress, vetch, Descurainia sophia and little japanese bearbind can be prevented and kill off, to grass family and sedge weed invalid.

Thought by our long-term field efficacy experiment, using with between some weed killer herbicide can overcome or alleviate chemical injury of crops.Meanwhile, because various weed killer herbicide is because of the difference of its chemical composition, physicochemical property, herbicide scope is also different.Some weed killer herbicide herbicide scope is narrower, but has unique action effect; The herbicidal spectrum of some weed killer herbicide is very wide, can prevent and treat the multiple weeds in field simultaneously.Field trial shows, Long-Time Service single herbicide not only easily produces resistance and poisoning, also can cause larger impact to soil environment.The composite of weed killer herbicide is widely regarded as one of important measures of weed killer herbicide reasonable employment, can reduce the generation of resistance after composite, reduces weed killer herbicide to the poisoning of economic crops, reduces the impact on soil, thus increase economic efficiency.Therefore we by pyribenzoxim and fluroxypyr two kinds of active ingredients composite, to reaching above-mentioned effect.

Summary of the invention

The object of the invention is to the shortcoming for prior art, the Herbicidal combinations that a kind of herbicidal effect is good, broad weed-killing spectrum, security performance are high, production-increasing function is remarkable, dispenser is convenient, toxicity is low is provided.

Above-mentioned Herbicidal combinations, the weight ratio of pyribenzoxim and fluroxypyr is 1:50 ~ 50:1.

Utilize above-mentioned Herbicidal combinations, be equipped with the known auxiliary agent of those skilled in that art, formulation of the present invention can be made with the known method of those skilled in that art.Its formulation that can process is for dispersibling oil-suspending agent.

Above-mentioned Herbicidal combinations is mainly used in annual gramineous weed in water prevention rice field and broad leaved weed.

The advantage that above-mentioned Herbicidal combinations has: 1. weeding scope is wide, can well water prevention rice field annual gramineae and broad leaved weed; 2. complex preparation is to rice safety; 3. two kinds of active ingredients composite after, there is more excellent synergy control efficiency.

Embodiment

First applicant carries out Herbicidal Testing Trials, to evaluate the composite herbicidal effect of two kinds of compositions to pyribenzoxim and fluroxypyr two kinds of active ingredients under room temperature condition of pot.Barnyard grass, Monochoria vaginalis are paddy field common weed, more difficult anti-.According to the herbicidal spectrum of two kinds of active ingredients, life is surveyed object and is decided to be barnyard grass, Monochoria vaginalis by us, and concrete performance is as follows:

Test medicine solution: the former medicine of fluroxypyr accurately taking the former medicine of constant weight 95% pyribenzoxim and 95%, dissolve with appropriate methyl alcohol, add in the clear water containing 0.1% Tween 80 emulsifier, be stirred to evenly, the solution containing certain active ingredient.Placebo solution: the water adding the Tween 80 emulsifier of 0.1% with isodose methyl alcohol.

Test method is as follows: after adopting the inspection of gowing method mixed, medicament is active to barnyard grass, Monochoria vaginalis, at the soil of the polypots amount of setting of high 7cm, diameter 10cm, 20, the seed for examination weeds is evenly sowed in polypots, the thin sand and soil that lid 0.5-1cm is thick, be placed on room temperature (about 20 DEG C) daylight to cultivate, the above-mentioned former drug solns prepared carries out composite and is diluted to the liquid of finite concentration gradient, until weed growth to carrying out cauline leaf spraying process during the 3-5 leaf phase, every alms bowl spraying liquid 1ml, each process 4 repetition, uses blank solution to compare.After process, test material is placed in room temperature and cultivates, the growing state of routine observation weeds, within 21 days, estimates damage symptoms and the growth inhibition situation of target weeds afterwards, weighs strain fresh weight, calculate fresh weight inhibition (%).

Evaluation of effect method, evaluate weed killer herbicide mode of application according to gowing method, its formula is as follows:

E ₀(％)＝X+Y×(100-X)/100

C＝E-E ₀

E in formula ₀be to the theoretical preventive effect that weeds suppress after two kinds of active ingredient mixtures, E is to the actual measurement preventive effect that weeds suppress after two kinds of active ingredient mixtures, X is that pyribenzoxim is at this dose to the preventive effect of target weeds, Y is that fluroxypyr is at this dose to the preventive effect of target weeds, C is the synergy coefficient of mixture preparation, in order to evaluate the synergy of two kinds of active ingredients, is synergistic effect when C is greater than 10%, be antagonism when being less than 10%, be addition between ± 10% time.

Table 1 pyribenzoxim and fluroxypyr different ratio survey result of the test to the raw of the activity of weeding of barnyard grass

Upper table can be found out, composite between two kinds of active ingredients, and synergy coefficient (C) is all greater than 14, has synergistic effect clearly to the preventive effect of barnyard grass.Wherein, fluroxypyr and the pyribenzoxim mixed ratio synergy coefficient (C) between 10:1-1:10 is best, has all exceeded 15.Wherein, both are in the proportioning of 1:1, and synergy coefficient (C) reaches 16.12, are the highest in all proportionings, and the synergistic effect after two kinds of active ingredients are composite is remarkable.

Table 2 fluroxypyr and pyribenzoxim different ratio survey result of the test to the raw of the activity of weeding of Monochoria vaginalis

Upper table can be found out, composite between two kinds of active ingredients, and synergy coefficient (C) has all exceeded 13, has good synergistic effect to the preventive effect of Monochoria vaginalis.Wherein the mixed ratio of pyribenzoxim and fluroxypyr between 10:1-1:10 synergy coefficient (C) exceeded 14, wherein, both are in the proportioning of 1:1, and synergy coefficient reaches 14.98, be the highest in all proportionings, both synergistic effects are very remarkable.

Above-mentioned experimental data can be found out, by pyribenzoxim and fluroxypyr composite, compared with the medicament that use is single, there is good synergistic effect, composite between active ingredient solves if fluroxypyr is to shortcomings such as grassy weed preventive effect are invalid, and the annual gramineae common for paddy field and broad leaved weed have good control efficiency.

Below by way of instantiation in order to further describe the present invention, but the present invention is absolutely not only only limitted to these embodiments following.In formula, percentage is all weight percentage, and the former medicine used and auxiliary agent are other producers and buy.Formulation examples is as follows:

Embodiment one: 25.5% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment two: 31% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment three: 22% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment four: 12% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment five: 20% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment six: 18% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment seven: 11% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment eight: 31% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment nine: 25.5% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Embodiment ten: 10% pyribenzoxim fluroxypyr dispersibles oil-suspending agent

Select above embodiment, carry out the field efficacy experiment of water prevention weeds in paddy field, for verifying the effect of embodiment control rice weed, contrasting with pyribenzoxim single dose and fluroxypyr single dose simultaneously, determining the control efficiency of each embodiment.Specifically be implemented as follows:

Test one: pyribenzoxim fluroxypyr dispersibles the HERBICIDE TEST of oil-suspending agent (English formulation title: OD) and different agents water prevention barnyard grass in paddy field, Monochoria vaginalis.Test site is Yi Suhe town, xiangtan, hunan province county, time is on July 21st, 2014, paddy rice is 3-4 leaf phase Direct-seeding Rice, the weeds 2-3 leaf phase, test medicine is all prepared according to above-mentioned example and is used 5% pyribenzoxim missible oil (English formulation title: EC) and 20% fluroxypyr missible oil (English formulation title: EC) to contrast, test totally ten two process, each process three repetition, community randomized arrangement, plot area 50m ².Carry out the spraying of cauline leaf, after medicine 15 days and within 30 days, observe the fresh weight preventive effect of each medicament respectively.The record dispenser synoptic data of a week, specific as follows:

Table 3 duration of test meteorological data

Respondent is barnyard grass, Monochoria vaginalis two kinds of weeds in field, and visual test medicament occurs without poisoning paddy rice.Preventive effect calculates according to the following equation:

Result of the test is as following table:

The test of pesticide effectiveness of table 4 pyribenzoxim fluroxypyr OD and different agents water prevention weeds in paddy field

Passable as apparent from above-mentioned data, pyribenzoxim and fluroxypyr composite after, to the preventive effect of 30 days after 15 days and medicine after barnyard grass, Monochoria vaginalis medicine all more than 88%, complex preparation, relative to pyribenzoxim and fluroxypyr two kinds of single doses, has very significant synergistic effect.Meanwhile, after two kinds of compositions are composite, complex preparation all has good preventive effect for grassy weed and broad leaved weed, and relative to single dose, synergistic effect is obvious.Visually, in the dosage range that this experiment uses, to rice safety.

As can be seen from test data, pyribenzoxim and fluroxypyr two kinds of compositions composite after, to the herbicidal effect of the weeds in field herbicidal effect far above two kinds of single doses, composite rear synergistic effect is remarkable, reduce the spraying times of peasant thus the amount of labour of reduction peasant, increase economic efficiency.

Claims

1. a Herbicidal combinations, is characterized in that: active component is made up of pyribenzoxim and fluroxypyr, and the weight ratio of described pyribenzoxim and fluroxypyr is 1:50 ~ 50:1.

2. Herbicidal combinations according to claim 1, is characterized in that: be made up of active component and auxiliary material and dispersible oil-suspending agent.