CN105165861A - Weeding composition - Google Patents

Abstract

The invention belongs to the technical field of pesticides and discloses a weeding composition. The weeding composition is characterized by containing two active components, namely flazasulfuron and pyriftalid. The composition has wide weed control spectrum, has obvious synergism, has novel active components and has no obvious cross resistance.

Description

A kind of Herbicidal combinations

Technical field

The invention belongs to pesticide field, being specifically related to a kind of weed killer herbicide for preventing and treating grassy weed between rice field, broad leaved weed, it is the binary Herbicidal combinations of active component by flazasulfuron 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 concern being increasingly subject to people of weeds in rice field.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.

Flazasulfuron (flazasulfuron) is a kind of interior absorption translocated herbicide, the reaction of the predecessor acetolactate synthestase producing side chain amino acid, leucine, isoleucine and valine can be suppressed, this composition can be weeds and respects work and follow absorption, conduct in plant corpus subsequently, by suppressing the biosynthesis of side chain amino acid in plant corpus, and cause sensitive plant growth retardation, chlorisis of respecting work, withered gradually, generally newborn blade chlorisis in 4-5 days, then expand to whole plant, within 20-30 days, weeds are thoroughly dead.Flazasulfuron is safe and harmless simultaneously can not be detrimental to health.To rice direct seeding field, seedling throwing field annual gramineae and broad leaved weed such as barnyard grass, a thousand pieces of gold, lady's-grass, Paspalum distichum, false loosestrife, Monochoria vaginalis, pondweed etc., there is good preventive effect.Structural formula is as follows:

Pyriftalid (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.Structural formula is as follows:

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, containing flazasulfuron and pyriftalid.

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

Utilize the Herbicidal combinations described in the invention described above, 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.Two, undertaken composite by two kinds of weed killer herbicides, the mechanism of action of these two kinds of components is different, and have wider herbicide spectrum and more excellent synergy control efficiency, have favorable effect to barnyard grass, a thousand pieces of gold, lady's-grass and broad leaved weed, 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 flazasulfuron and pyriftalid 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 by we, and object is decided to be barnyard grass, the concrete performance of Monochoria vaginalis is as follows:

The compound method of test medicine is as follows:

Test medicine solution: the former medicine of pyriftalid and the former medicine of 95% flazasulfuron 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: 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 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 flazasulfuron 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 flazasulfuron and pyriftalid different ratio survey result of the test to the raw of barnyard grass activity of weeding

As can be seen from upper table data, flazasulfuron and pyriftalid composite after, fine to the preventive effect of barnyard grass, synergy coefficient (C) is all greater than 12%, and the synergistic effect after two kinds of active ingredients are composite is remarkable.

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

As can be seen from upper table data, pyriftalid and flazasulfuron composite after, fine to the preventive effect of Monochoria vaginalis, synergy coefficient (C) is all greater than 13%, and the synergistic effect after two kinds of active ingredients are composite is remarkable.

Above-mentioned 2 raw tests are tested and are shown, compared with the effect of single medicament, by flazasulfuron and pyriftalid composite after, good synergistic effect is had to the preventive effect of barnyard grass, Monochoria vaginalis, 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 provide.Formulation examples is as follows:

Embodiment one: 25.5% flazasulfuron pyriftalid suspending agent

Embodiment two: 31% flazasulfuron Pyriftalid water dispersible granule

Embodiment three: 11% flazasulfuron pyriftalid suspending agent

Embodiment four: 12% flazasulfuron Pyriftalid water dispersible granule

Embodiment five: 20% flazasulfuron pyriftalid suspending agent

Embodiment six: 30% flazasulfuron Pyriftalid water dispersible granule

Embodiment seven: 22% flazasulfuron pyriftalid suspending agent

Embodiment eight: 15.5% flazasulfuron Pyriftalid water dispersible granule

Embodiment nine: 51% flazasulfuron pyriftalid 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 flazasulfuron single dose and pyriftalid single dose simultaneously, determining the control efficiency of each embodiment.Specifically be implemented as follows:

Test one: 20% flazasulfuron pyriftalid suspending agent and other preparation water prevention barnyard grass in paddy field, Monochoria vaginalis weed killer herbicide experiment.Experiment place is Xuzhou City of Jiangsu Province, time is on June 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 25% flazasulfuron 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 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:

The test of pesticide effectiveness of table 420% flazasulfuron and pyriftalid suspending agent and other chemical control rice weeds

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: Xuzhou, Jiangsu Province

Passable as apparent from above-mentioned data, flazasulfuron and composite 9 embodiments of pyriftalid two kinds of compositions, to barnyard grass, the Monochoria vaginalis preventive effect of 15 days, 30 days all more than 87%, compared to flazasulfuron and pyriftalid single dose, complex preparation has significant synergies.Visually, in the dosage range that this experiment uses, to rice safety.

As can be seen from test data, flazasulfuron and pyriftalid 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, herbicidal spectrum is wide, reduce the spraying times of peasant thus the amount of labour of reduction peasant, increase economic efficiency.

Claims (2)

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

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