CN104757009A - Compounded herbicide - Google Patents

Abstract

The invention belongs to the technical field of pesticides and relates to a compounded herbicide which is characterized by comprising two active components: ethoxysulfuron and pyriftalid. The herbicide composition can be processed to form a water-dispersible granule and a suspending agent. The herbicide composition is enlarged in weed removing spectrum, is significant in weed removing efficiency, is long in lasting period, has a significant synergism and is safe to rice.

Description

A kind of complex weedicide

Technical field

The invention belongs to pesticide field, being specifically related to a kind of complex weedicide for preventing and treating grassy weed between rice field, broad leaved weed and nutgrass flatsedge, is be the binary Herbicidal combinations of active component by ethoxysulfuron and pyriftalid.

Background technology

Paddy rice is main cereal crop, and rice is the staple food grain of the population in the world 1/3rd, almost accounts for 2/3rds of its food.China's Rice Production is with a long history, distributional region is wide, and growing area spans cool temperate zone, middle temperate zone, warm temperate zone, five climatic zones in subtropics and the torrid zone from north to south, is eating rice production state the biggest in the world, sowing area occupies the second in the world, and gross yield ranks first in the world.Rice has very important status in production, the stable yields of paddy rice, increases production and has important strategic importance to the grain security of China.Along with the establishing in large scale of paddy rice, the weeds in rice field receive the concern of people increasingly.According to FAO (Food and Agriculture Organization of the United Nation), about 250 kinds, the weeds of whole world harm staple food crop, become the key factor affecting crop yield.Processing mode at present for weeds has weeding by machine and chemical herbicide weeding, use chemical herbicide not only can save large quantities of labour, raise labour productivity, and weeds are removed between the seedling making common mechanical be difficult to remove, make mechanization perfect further, traditional tillage and cultivation method is also improved.Therefore, the investigation and application of chemical herbicide is more and more subject to people's attention.At present, it is necessary for researching and developing novel, efficient chemical weed killer herbicide.

Ethoxysulfuron, English name: ethoxysulfuron is branched chain amino acid synthesis (ALS or AHAS) inhibitor.By blocking the biosynthesis of basic amino acid valine and isoleucine, thus stop cell division and plant growth.There is good selectivity, for water prevention rice field nutgrass flatsedge and annual broadleaf weed.

Its chemical structural formula:

Pyriftalid is a kind of efficient pyrimidine salicylic acid selective herbicide, for inhibitor of acetolactate synthetase, mainly to be moved to leaves and stems by root absorption, also absorb by cauline leaf, special efficacy is had to barnyard grass before 3 leaf phases, effective to grassy weeds such as low age moleplant seed, lady's-grass, effective to broad leaved weeds such as false loosestrife, cyperus iria, needle spikesedge herb, mexicana, Monochoria vaginalis, there is certain preventive effect to sedge weed.Pyriftalid is mainly potential difference and selects weeding, uses after being applicable to transplanted rice field or seedling throwing field rice striking root.

Summary of the invention

The object of the invention is to the shortcoming for prior art, the complex weedicide 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 complex weedicide, containing ethoxysulfuron and pyriftalid.

Above-mentioned complex weedicide, the weight ratio of ethoxysulfuron and pyriftalid is 1:50 ~ 50:1.

Utilize above-mentioned complex weedicide, 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 water dispersible granules, suspending agent.

The advantage that the present invention has: one, undertaken composite by two kinds of weed killer herbicides, in certain ratio range, its synergy shows obvious synergistic effect, and the herbicidal effect of composition is significantly improved than single dose.Reduce pesticide cost and the adverse effect to ecotope, it applies huge Social benefit and economic benefit.Two, undertaken composite by two kinds of weed killer herbicides, the mechanism of action of these two kinds of components is different, so have wider herbicide spectrum and more excellent synergy control efficiency; In addition, pyriftalid and ethoxysulfuron have favorable effect to broad leaved weed and nutgrass flatsedge, and both are composite, and effect is faster and better.Three, between two-component without cross resistance.

Embodiment

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

The compound method of test medicine is as follows:

Test medicine solution: the former medicine of pyriftalid and the former medicine of 97% ethoxysulfuron that accurately take constant weight 96%, dissolves with the methyl alcohol of ten times, adds in the clear water containing 0.1% Tween 80 emulsifier, is stirred to evenly, the solution containing certain active ingredient.Placebo solution: isodose methyl alcohol add containing 0.1% Tween 80 emulsifier clear water in.

Test method is as follows: after adopting the inspection of gowing method mixed, medicament is to the activity of barnyard grass, Monochoria vaginalis and difformed galingale herb, 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 ethoxysulfuron is at this dose to the preventive effect of target weeds, Y is that pyriftalid 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 ethoxysulfuron and pyriftalid different ratio survey result of the test to the raw of barnyard grass activity of weeding

Raw survey result as can be seen from above-mentioned, ethoxysulfuron and pyriftalid composite after, fine to the preventive effect of barnyard grass, after two kinds of compositions are composite, have significant synergistic effect, synergy coefficient (C) is all greater than 10%.Synergistic effect after two kinds of active ingredients are composite is remarkable.

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

Raw survey result as can be seen from above-mentioned, ethoxysulfuron and pyriftalid composite after, fine to the preventive effect of Monochoria vaginalis, after two kinds of compositions are composite, have significant synergistic effect, synergy coefficient (C) is all greater than 10%.Synergistic effect after two kinds of active ingredients are composite is remarkable.

Table 3 ethoxysulfuron and pyriftalid different ratio survey result of the test to the raw of difformed galingale herb activity of weeding

Raw survey result as can be seen from above-mentioned, ethoxysulfuron and pyriftalid composite after, fine to the preventive effect of difformed galingale herb, after two kinds of compositions are composite, have significant synergistic effect, synergy coefficient (C) is all greater than 10%.Synergistic effect after two kinds of active ingredients are composite is remarkable.

Above-mentioned three raw tests are tested and are shown, compared with the effect of single medicament, by ethoxysulfuron and pyriftalid composite after, good synergistic effect is had to the preventive effect of barnyard grass, Monochoria vaginalis, difformed galingale herb, after two kinds of composite reagents, solve the problem that the preventive effect of single medicament to a certain class weeds is bad, all have good control efficiency to the weeds of paddy field frequent species.

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% ethoxysulfuron pyriftalid suspending agent

Embodiment two: 31% ethoxysulfuron Pyriftalid water dispersible granule

Embodiment three: 11% ethoxysulfuron pyriftalid suspending agent

Embodiment four: 12% ethoxysulfuron Pyriftalid water dispersible granule

Embodiment five: 20% ethoxysulfuron pyriftalid suspending agent

Embodiment six: 30% ethoxysulfuron Pyriftalid water dispersible granule

Embodiment seven: 22% ethoxysulfuron pyriftalid suspending agent

Embodiment eight: 15.5% ethoxysulfuron Pyriftalid water dispersible granule

Embodiment nine: 51% ethoxysulfuron pyriftalid suspending agent

Select above embodiment, carry out the field control effectiveness test of water prevention direct sowing of rice field weed, for verifying the effect of embodiment control rice weed, contrasting with ethoxysulfuron single dose and pyriftalid single dose simultaneously, determining the control efficiency of each embodiment.Specifically be implemented as follows:

The HERBICIDE TEST of barnyard grass such as rice direct seeding field such as control such as preparation such as test one: 20% ethoxysulfuron pyriftalid suspending agent etc., Monochoria vaginalis and difformed galingale herb.Test site is Zhang Gou town, Xiantao City in Hubei Province, time is on June 27th, 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 15% ethoxysulfuron water dispersible granules and 10% pyriftalid suspending agent 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 strain preventive effect of each medicament respectively.Record the synoptic data on the dispenser same day and a week thereafter, specific as follows:

Table 4 duration of test meteorological data

Respondent is the barnyard grass in field, Monochoria vaginalis, difformed galingale herb three kinds of weeds, 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 5 ethoxysulfuron and pyriftalid different ratio control rice weed

Note: in table, data are the mean value repeated for 3 times, letter is all Duncan testing differentia remarkable time mutually: in June, 2014 place: Zhang Gou town, Xiantao City in Hubei Province

Passable as apparent from above-mentioned data, ethoxysulfuron and composite 9 embodiments of pyriftalid, to barnyard grass, Monochoria vaginalis, the common weeds of difformed galingale herb three kinds of rice direct seeding fields 15 days, the preventive effect of 30 days is all more than 85%, wherein, 30% ethoxysulfuron Pyriftalid water dispersible granule (embodiment six), 22% ethoxysulfuron pyriftalid suspending agent (embodiment seven), 2 embodiments have all exceeded 90% to two kinds of weeds the preventive effect of 30 days, after two kinds of compositions are composite, complex preparation all has good preventive effect for above three kinds of paddy field weeds, synergistic effect is obvious.Visually, in the dosage range that this test uses, to rice safety.

As can be seen from field test data, ethoxysulfuron and the composite rear herbicidal effect to weeds in field of pyriftalid two kinds of compositions are far above the herbicidal effect of two kinds of single doses, composite rear synergistic effect significantly, reduce peasant spraying times thus reduce the amount of labour of peasant, increase economic efficiency.

Claims (2)

1. a complex weedicide, is characterized in that: active component is made up of ethoxysulfuron and pyriftalid, and the weight ratio of described ethoxysulfuron and pyriftalid is 1:50 ~ 50:1.

2. complex weedicide according to claim 1, is characterized in that: make water dispersible granules, suspending agent by active component and auxiliary material.