CN1471824A

CN1471824A - Composite agricultural chemical for banded sclrerotial blight of rice

Info

Publication number: CN1471824A
Application number: CNA031320503A
Authority: CN
Inventors: 吴进才
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-14
Filing date: 2003-07-14
Publication date: 2004-02-04
Anticipated expiration: 2023-07-14
Also published as: CN1193668C

Abstract

A composite agricultural chemical for preventing and treating the hypochnus, rotten meck and green smut of paddy rice contains hexaconazole and jianganmycin. Its advantages are high synergistive effect and low by-effect.

Description

A kind of Recompounded pesticide of preventing and treating rice sheath blight disease

Technical field

The present invention relates to a kind of new drug of preventing and treating rice sheath blight disease, rice blast, false smut.

Background technology

Rice sheath blight disease is a kind of common disease, the frequently-occurring disease of China paddy rice.This disease surpasses reported first in 1934 by Wei Jing.Now spread all over each rice district of China, general south overweights the north, annual hundred million mu of the about 10-20 of area that take place.Light underproduction 5-10%, heavy reached at 50-70%.The control rice sheath blight disease mainly relies on chemical agent.Application of special effects medicine mazn before the beginning of the eighties, but mazn is a class organic arsenic preparation, contaminated environment not only very easily causes poisoning (can not ear) thereby is banned use of by country in paddy rice booting stage.Behind the mazn forbidding, alternative medicament mainly is a jinggangmeisu.Jinggangmeisu is a class antibiotic, finds that six effective ingredients are arranged the seventies by Shanghai pesticide research institute.But main active ingredient is based on the A component.Jinggangmeisu is similar by the Validamycin of Japan's military field pharmaceutical industries exploitation to 1972.Jinggangmeisu toxicity is low, and low price is the govern-house-variety of preventing and treating rice sheath blight disease since the early 1980's always.The mould poison in well ridge is the very strong agricultural antibiotic of interior absorption, after the mycelia of Rhizoctonia solani Kuhn touches this medicament, can be absorbed very soon and in thalline, conduct by mycelial cell, disturb and the normal development of inhibition somatic cells, thereby play therapeutic action, under laboratory condition, obviously growth is undesired behind the mycelia contact medicament, but after crossing certain hour, mycelial growth still can recover, so about general 7-10d of field efficacy phase.Though germ is not very too high to the pesticide resistance of jinggangmeisu, go up the long-term single jinggangmeisu that frequently excessively uses owing to produce, field efficacy descends to some extent, and the lasting period is short partially.

Own azoles alcohol is the domestic novel germicide of preventing and treating multiple diseases of exploitation in recent years.Its characteristics are super-high-efficient, high activity, and for example per hectare 30g prevents and treats the coffee rust, and effect is better than triazolone per hectare 250g low toxicity, the oral LD of rat acute ₅₀Male 2189mg/kg, female 6071mg/kg; Not having obviously residually, is the up-and-coming bactericide of a class.But also be not used to prevent and treat rice sheath blight disease at present.

Summary of the invention

The purpose of this invention is to provide a kind of low toxicity, efficient, cheap, have the Recompounded pesticide of preventing and treating rice sheath blight disease of broad prospect of application.

Effective ingredient of the present invention is the pure and mild jinggangmeisu of own azoles.

Wherein, the effective ingredient of own azoles alcohol is 0.1g.a.i～10g.a.i; The jinggangmycin A composition is 1g.a.i～20g.a.i in the jinggangmeisu.

In research process of the present invention, respectively and composite jinggangmycin pure about own azoles have been carried out comparative study to inhibitory action, proportioning screening, synergy test and the field of rice sheath blight disease to the sheath blight disease controlling effect, obtained following achievements:

1, composite dose and single agent are to the toxicity regression of sheath blight fungus

Composite after measured dose and single agent to sheath blight fungus Growth Inhibition virulence regression equation are:

Jinggangmeisu: Y=3.1741+0.9908x r=0.9903

IC ₅₀＝69.6386mg/L

Own azoles alcohol: Y=5.3891+2.1394x r=0.9893

IC ₅₀＝0.65785mg/L

Own azoles alcohol and jinggangmeisu mixture: Y=5.7011+2.1354x r=0.9939

IC ₅₀＝0.4696mg/L

Y is the banded sclerotial blight repressed probability value of growing in the following formula, and x is the logarithm value of drug concentration, IC ₅₀Be concentration in suppressing.The pure and mild jinggangmeisu ratio of own azoles is 1: 3.125 in composite dose of the following formula

2, coefficient of synergism

The toxicity index that with the jinggangmeisu is each medicament of standard medicament is TI _Well=100, TI _Oneself=10584.79, TI _Mix=14829.3

Composite dose theoretical toxicity index is TTI=2642.81

Co-toxicity coefficient is 561.12

Be synergy according to synergy criterion co-toxicity coefficient greater than 100, therefore own azoles alcohol and the mould composite extremely significant synergistic effect that has in well ridge.

3, composite dose of field efficacy to banded sclerotial blight

Through the test in Guangxi and Jiangsu field control banded sclerotial blight in 2 years, the result showed that composite dose has fabulous control efficiency to banded sclerotial blight.7d, 14d preventive effect be respectively up to 93.14-98.1%, 85.9-93% behind the medicine, and single with jinggangmeisu (every 667m ²50g, 2 bags) preventive effect is respectively 79.4-85.2% and 64.8-82.9%, and composite dose preventive effect is significantly higher than singly uses jinggangmeisu.

Comprehensive indoor antibacterial test, co-toxicity coefficient and field control effect, own azoles alcohol has the notable synergistic effect with pesticide of composite jinggangmycin, avoid single frequent excessive use jinggangmeisu to reduce the negative interaction of field efficacy, have scientific and field efficacy effect preferably, its remarkable in economical benefits has the prospect of large scale application.

The present invention also can increase other auxiliary agent formation wetting powder and suspending agent is convenient to produce use.

Wherein, Recompounded pesticide is a wetting powder, and wherein auxiliary agent accounts for 5～20% of gross weight, and auxiliary agent mainly is made up of wetting agent, dispersant.

Recompounded pesticide is a suspending agent, and wherein auxiliary agent accounts for 5～10% of gross weight, and auxiliary agent mainly is made up of dispersant, wetting agent, thickener, stabilizing agent and defoamer.

Specific embodiment

Embodiment 1:

Preparation suspension pesticide 100kg takes by weighing own azoles alcohol, and making its effective ingredient is 4.8kg.a.i; Take by weighing jinggangmeisu, making its effective ingredient is 15kg.a.i; Take by weighing wetting agent NNO 5kg respectively, dispersant LS 5kg, thickener 0.5kg, stabilizing agent 0.5kg, defoamer 0.05kg, water 69.15kg fully mixes above-mentioned each component, and divides packing.

Thickener can be gum Arabic or methylcellulose or carboxymethyl cellulose or polyvinyl alcohol.

Defoamer can be the organosilicon anti-foaming agent.

Stabilizing agent can be a Magnesiumaluminumsilicate.

Embodiment 2:

Preparation Wettable pesticide powder 100kg.

Take by weighing own azoles alcohol, making its effective ingredient is 2.4kg.a.i; Take by weighing jinggangmeisu, making its effective ingredient jinggangmycin A is 7.5kg.a.i; Divide the dispersant LS 5kg that has another name called, lubricant NNO 5kg, inserts potter's clay 80.1kg fully mixes above-mentioned each component, and divides packing.

Claims

1, a kind of Recompounded pesticide of preventing and treating rice sheath blight disease is characterized in that its effective ingredient is the pure and mild jinggangmeisu of own azoles.

2, according to the described Recompounded pesticide of claim 1, the effective ingredient that it is characterized in that own azoles alcohol is 0.1g.a.i～10g.a.i; The jinggangmycin A composition is 1g.a.i～20g.a.i in the jinggangmeisu.

3, according to the described Recompounded pesticide of claim 2, it is characterized in that Recompounded pesticide is a wetting powder, form by own azoles alcohol, jinggangmeisu and auxiliary agent, inserts, wherein auxiliary agent accounts for 5～20% of gross weight.

4,, it is characterized in that auxiliary agent mainly is made up of wetting agent, dispersant according to the described Recompounded pesticide of claim 3.

5, according to the described Recompounded pesticide of claim 2, it is characterized in that Recompounded pesticide is a suspending agent, form by own azoles alcohol, jinggangmeisu and auxiliary agent, water, wherein auxiliary agent accounts for 5～10% of gross weight.

6,, it is characterized in that auxiliary agent mainly is made up of dispersant, wetting agent, thickener, stabilizing agent and defoamer according to the described Recompounded pesticide of claim 5.