CN105052939A - Compound herbicide - Google Patents

Abstract

The invention belongs to the technical field of pesticides and discloses a compound herbicide. The compound herbicide is characterized by comprising two active ingredients, namely, fluroxypyr and pyriftalid and is novel in active ingredient, wide in weeding spectrum, significant in synergistic effect and free of obvious cross resistance.

Description

A kind of complex weedicide

Technical field

The invention belongs to pesticide field, relate to a kind of complex weedicide for preventing and kill off paddy field weed specifically, being specifically related to a kind of weed killer herbicide for preventing and treating grassy weed between rice field, broad leaved weed, is be the complex weedicide of active component by fluroxypyr 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.

Fluroxypyr (fluroxypyr) is inner sucting conduction type herbicide after seedling, and to Crop securify, do in object in resistance, can lose toxicity in conjunction with conjugates, easily degrade in soil, the half life period is shorter, to succession crop safety.Fluroxypyr can prevent and kill off the various broad leaved weeds such as clearvers, volume stem knotweed, kitchen garden, black nightshade, chickweed, common vetch, field bindweed, weasel hemp nettle, pale persicaria, willow leaf thorn knotweed, Amaranthus retroflexus, dayflower, elscholtiza, penny cress, vetch, Descurainia sophia and little japanese bearbind, to grass family and sedge weed invalid.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 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 fluroxypyr and pyriftalid.

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

Utilize complex weedicide of the present invention, 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 wetting powder, 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 fluroxypyr have favorable effect to broad leaved weed, 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 fluroxypyr 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 object and is decided to be barnyard grass, Monochoria vaginalis by us, and concrete performance 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% fluroxypyr that accurately take constant weight 96%, dissolve with the methyl alcohol of ten times, 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 to the activity of 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 fluroxypyr 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 fluroxypyr and pyriftalid different ratio survey result of the test to the raw of barnyard grass activity of weeding

As can be seen from the above results, fluroxypyr and pyriftalid composite after, synergy coefficient (C) is all greater than 13%, and fine to the preventive effect of barnyard grass, synergistic effect is remarkable.

Table 2 fluroxypyr 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 the above results, fluroxypyr and pyriftalid composite after, synergy coefficient (C) is all greater than 13%, fine to the preventive effect of Monochoria vaginalis, has significant synergies.

Above-mentioned 2 raw survey experiments show, compared with the effect of single medicament, by fluroxypyr and pyriftalid composite after, have good synergistic effect to the preventive effect of barnyard grass, Monochoria vaginalis, solve the problem of single pharmacy control efficacy difference, 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: 51% fluroxypyr pyriftalid suspending agent

Embodiment two: 31% fluroxypyr Pyriftalid water dispersible granule

Embodiment three: 22% fluroxypyr pyriftalid suspending agent

Embodiment four: 6% fluroxypyr Pyriftalid water dispersible granule

Embodiment five: 10% fluroxypyr pyriftalid suspending agent

Embodiment six: 18% fluroxypyr pyriftalid wetting powder

Embodiment seven: 11% fluroxypyr pyriftalid suspending agent

Embodiment eight: 31% fluroxypyr Pyriftalid water dispersible granule

Embodiment nine: 25.5% fluroxypyr 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 fluroxypyr single dose and pyriftalid single dose simultaneously, determining the control efficiency of each embodiment.

Specifically be implemented as follows:

The weed killer herbicide experiment of 10% fluroxypyr pyriftalid suspending agent and other chemical control paddy field barnyard grasses, Monochoria vaginalis.Experiment place is 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 20% fluroxypyr missible oil 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.Synoptic data in record dispenser one 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:

The test of pesticide effectiveness of table 410% fluroxypyr 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: Xiantao City in Hubei Province

Passable as apparent from above-mentioned data, 9 embodiments, have significant synergies compared to fluroxypyr and pyriftalid single dose all more than 85% to the common weeds preventive effect of 15 days, 30 days of barnyard grass, Monochoria vaginalis two kinds of paddy fields.Visually, in the dosage range that this experiment uses, to rice safety.

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

Claims (2)

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

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