CN105145571A - Compounded herbicide - Google Patents

Abstract

The invention belongs to the technical field of pesticides and discloses a compounded herbicide. The compounded herbicide is characterized by containing two kinds of active ingredients, i.e., fluoroglycofen-ethyl and cyhalofop-butyl. The compounded preparation is used for preventing and treating Gramineae weeds and broad-leaved weeds in paddy field, is efficient and broadspectrum, is long in effect duration, is safe to rice and is free from damage caused by chemicals.

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, be specifically related to a kind of weed killer herbicide for preventing and treating grassy weed between rice field, broad leaved weed, it is the complex weedicide of active component by fluoroglycofen-ethyl and cyhalofop-butyl.

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.

Fluoroglycofen-ethyl (fluoroglycofen-ethyl) is a kind of new and effective diphenyl ether beans field, paddy rice herbicide after seedling.After it is absorbed by plants, make protoporphyrin oxidase suppressed, generate the virose tetrapyrrole of plant cell tool, gather and have an effect.It has, and speed of action is fast, activity is high, do not affect the features such as second stubble crop.Can effectively prevent and kill off the multiple broad leaved weeds such as Chenopodiaceae, polygonaceae, three-coloured amaranth, Siberian cocklebur, black nightshade, kitchen garden, dayflower, setose thistle.Structural formula is as follows:

Cyhalofop-butyl (cyhalofop-butyl) is a kind of fragrant phenoxy phenoxy propionic acid weed killer herbicide, has tight security, have Uptake and translocation to paddy rice.Medicament absorbs via the blade of weeds, leaf sheath, conduct through phloem, accumulate in weeds meristem zone, resist acetyl-CoA carboxylase (ACCase), fatty acid is synthesized stop, the growth division of cell can not normally be carried out, and membranous system etc., containing fat structural deterioration, finally cause Plant death.Be absorbed into weeds Mortality Ratio from cyhalofop-butyl comparatively slow, generally need 1-3 week.Cyhalofop-butyl is higher to grass family moleplant seed preventive effect, hold concurrently anti-lady's-grass, Paspalum distichum, green foxtail, eleusine indica etc. simultaneously.Cyhalofop-butyl to sedge weed and broad leaved weed invalid, especially to the above broad leaved weed of 4 leaf; Also only have certain inhibitory action to 2 leaf age angustifolia arrowhead herbs during high dose, herbicide spectrum is narrower.Cyhalofop-butyl is for many years applied with the form of single dose always, and the rising year by year of the Weed Resistance caused after using, consumption increases year by year, and use cost is more and more higher.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, the weight ratio of fluoroglycofen-ethyl and cyhalofop-butyl is 1:30 ~ 30:1.

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 aqueous emulsion, dispersibles oil-suspending agent.

Above-mentioned complex weedicide can prevent and treat grass family, the broad-leaved section weeds such as barnyard grass in paddy field, lady's-grass, a thousand pieces of gold, Monochoria vaginalis, false loosestrife, water three-coloured amaranth.

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.Two, utilize different mechanism of action two kinds of components to carry out composite, there is wider herbicide spectrum.Three, between two kinds of compositions without cross resistance.

Embodiment

First applicant carries out Herbicidal Testing Trials, to evaluate the composite herbicidal effect of two kinds of compositions to fluoroglycofen-ethyl and cyhalofop-butyl two kinds of active ingredients under room temperature condition of pot.A thousand pieces of gold, 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 a thousand pieces of gold, Monochoria vaginalis by us, and concrete performance is as follows:

The compound method of test medicine is as follows:

Test medicine solution: the cyhalofop-butyl active compound and the former medicine of 95% fluoroglycofen-ethyl 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 a thousand pieces of gold, 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 fluoroglycofen-ethyl is at this dose to the preventive effect of target weeds, Y is that cyhalofop-butyl 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 fluoroglycofen-ethyl and cyhalofop-butyl different ratio survey result of the test to the raw of a thousand pieces of gold activity of weeding

Raw survey result as can be seen from above-mentioned, fluoroglycofen-ethyl and cyhalofop-butyl composite after, synergy coefficient (C) is all greater than 12%, fine to the preventive effect of a thousand pieces of gold, has significant synergistic effect.

Table 2 fluoroglycofen-ethyl and cyhalofop-butyl 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, fluoroglycofen-ethyl and cyhalofop-butyl composite after, synergy coefficient (C) is all greater than 12%, and fine to the preventive effect of Monochoria vaginalis, synergistic effect is remarkable.

Above-mentioned 2 raw survey experiments show, compared with the effect of single medicament, by fluoroglycofen-ethyl and cyhalofop-butyl composite after, good synergistic effect is had to the preventive effect of a thousand pieces of gold, Monochoria vaginalis, after two kinds of compositions are composite, solve the problem that single medicament is bad to a certain class Weed-control effect, 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 the buying of other producers.Formulation examples is as follows:

Embodiment one: 15.5% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Embodiment two: 11% fluoroglycofen-ethyl aqueous cyhalofop-butyl emulsion

Embodiment three: 12% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Embodiment four: 16% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Embodiment five: 20% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Embodiment six: 8% fluoroglycofen-ethyl aqueous cyhalofop-butyl emulsion

Embodiment seven: 6% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Embodiment eight: 22% fluoroglycofen-ethyl aqueous cyhalofop-butyl emulsion

Embodiment nine: 31% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent

Select above embodiment, carry out the field efficacy experiment of water prevention direct sowing of rice field weed, for verifying the effect of embodiment control rice weed, contrasting with fluoroglycofen-ethyl single dose and cyhalofop-butyl single dose simultaneously, determining the control efficiency of each embodiment.Specifically be implemented as follows:

Experiment one: 20% fluoroglycofen-ethyl cyhalofop-butyl dispersibles the weed killer herbicide experiment of oil-suspending agent and other preparation water prevention rice field a thousand pieces of gold, Monochoria vaginalis.Experiment place is Yugan County, Jiangxi Province, time is on May 2nd, 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% fluoroglycofen-ethyl missible oil and 10% cyhalofop-butyl to dispersible oil-suspending agent and contrasts, 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 a thousand pieces of gold, 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 fluoroglycofen-ethyl and cyhalofop-butyl 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 May, 2014 place: Yugan County, Jiangxi Province

Passable as apparent from above-mentioned data, complex preparation to a thousand pieces of gold, the Monochoria vaginalis preventive effect of 15 days, 30 days all more than 85%, wherein, 20% fluoroglycofen-ethyl cyhalofop-butyl dispersibles oil-suspending agent (embodiment five) embodiment and has all exceeded 91% to 2 kinds of weeds the preventive effect of 30 days, exceed other several embodiments, therefore thought that this proportioning is optimum.After two kinds of compositions are composite, all have good preventive effect for grass family, broad leaved weed, relative to single dose, synergistic effect is obvious.Visually, in the dosage range that this experiment uses, to rice safety.

As can be seen here, fluoroglycofen-ethyl and the composite rear herbicidal effect to weeds in field of cyhalofop-butyl two kinds of compositions are far above the herbicidal effect of two kinds of single doses, and composite rear synergistic effect is remarkable, while expanding herbicidal spectrum, decrease 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 fluoroglycofen-ethyl and cyhalofop-butyl, and the weight ratio of described fluoroglycofen-ethyl and cyhalofop-butyl is 1:30 ~ 30:1.

2. complex weedicide according to claim 1, is characterized in that: made aqueous emulsion by active component and auxiliary material, dispersibled oil-suspending agent.