CN104872164A

CN104872164A - Method for preventing citrus red mites

Info

Publication number: CN104872164A
Application number: CN201510282329.6A
Authority: CN
Inventors: 杨新兰
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-29
Filing date: 2015-05-29
Publication date: 2015-09-02

Abstract

Disclosed is a method for preventing citrus red mites. The method includes: blending abamectin, hexythiazox and flufenoxuron according to the effective constituent weight ratio of 1-2:3-8:5-10, then adding water for dilution, and evenly spraying the mixture on citrus leaves. The method has the significant advantages that due to different action mechanisms of the abamectin, hexythiazox and flufenoxuron, obvious synergetic effect is achieved by rational mixing, pesticide effect is increased greatly, pesticide consumption per mu is lowered, and accordingly harmful effect on environment and pesticide residue are reduced, duration of pesticide effect is prolonged, and the defect that the single agent is incapable of preventing and covering the entire growth cycle of red mites is overcome.

Description

A kind of method of preventing and treating citrus red mite

Technical field

The present invention relates to a kind of method of preventing and treating citrus red mite.

Background technology

Citrus red mite is because its fertility is very strong, life cycle is shorter, take place frequently throughout the year, so very easily produce resistance to miticide and make drug effect obviously decline, at present, control citrus red mite all adopts chemical agent to prevent and treat, mainly also there is following difficult point to wait to capture: the lasting period of medicament is short, though good effect can be reached after dispenser, but usually break out again after three or five days; Reagent toxicity is comparatively large, and medicament is residual serious.

Avermectin, it is a kind of macrolide disaccharide compounds, have insects and mites and tag and stomach poison function, without systemic action, but have very strong osmosis to blade, subepidermal insect can be killed, if the one-tenth mite mite on Avermectin energy effectively preventing oranges and tangerines, because not having ovicidal activity, therefore the lasting period is shorter.

Hexythiazox, is the novel miticide of thiazolidine ketone, has good penetrability to plant top layer, but without Uptake and translocation effect.If there is strong ovicidal to various plants evil mite, kill the characteristic of young mite mite, invalid to one-tenth mite, but to touching the ovum that liquid female adult pest produces, there is the effect suppressing hatching, the lasting period reaches about 50 days.

Flufenoxuron, belongs to acyl group ureas insecticidal/acaricidal agent, has and tag and stomach poison function, main suppresses the chitinous synthesis of insect cuticle, insect can not normally be casted off a skin or abnormal and dead.After adult contact medicine, though the ovum of product hatch into larva also can be very fast dead.Flufenoxuron is widely used on oranges and tangerines, grape, soybean, fruit tree, king's rice and coffee, planting property of control food mite class (thorn goitre mite, short hairs mite, Panonychus citri, rust mite, tetranychus telarius etc.) and other insects many, and have good lasting effect, but quick-acting is poor.

The mechanism of action of Avermectin, Hexythiazox, flufenoxuron is different, and the miticide composition being active ingredient with Avermectin, Hexythiazox, flufenoxuron, there is no relevant report for the control and application preventing and treating citrus red mite.

Summary of the invention

Technical problem to be solved by this invention is, provides a kind of high-efficiency low-toxicity, lasting period long, the method for the control citrus red mite that mu cost is low.

The present invention solves the problems of the technologies described above taked technical scheme: provide a kind of method of preventing and treating citrus red mite, be 1-2: 3-8: 5-10 carry out medicament mixture by Avermectin, Hexythiazox and flufenoxuron according to active ingredient weight ratio, then be watered dilution, even spraying is on Citrus leaf.

Described Avermectin, Hexythiazox and flufenoxuron according to method known in those skilled in the art, can add respective secondary auxiliary agent and are mixed with the practical formulation of the applicable agricultural such as microemulsion, aqueous emulsion.

The present invention has following advantage and remarkable result, Avermectin, Hexythiazox are different with the mechanism of action of flufenoxuron, rational mixture has obvious synergistic function, significantly can improve drug effect, reduce agricultural chemicals mu consumption, thus the harmful effect reduced environment and residue of pesticide, extend the duration of drug effect, solve single medicament simultaneously and can not prevent and treat the defect covering all growth cycles of two spotted spider mite.

Embodiment

Be described further technical scheme of the present invention and technique effect with the indoor joint toxicity measuring test and field medicine effect test that measure biocidal activity below, percentage of the present invention is all weight percentage.

Embodiment 1: Avermectin, Hexythiazox and flufenoxuron and different ratio are to the toxicity test of Tetranychus urticae

Test method is with reference to " People's Republic of China (PRC) agricultural industry criteria NY/T1154.12-2006 ".Picking up from the female one-tenth mite of Tetranychus urticae in field, through indoor feeding 30 generation, selecting the female one-tenth mite of growth uniformity as supplying examination worm.Adopt oranges and tangerines seedling method, namely on little basin oranges and tangerines seedling, connect Panonychus citri 50-60 head mite, check radix after 1 day, choose except after dead mite, mend to add and live into mite, retaining often process mite number is about 50.The seedling of mite will be had to use spray tower to spray, moves into 25 DEG C, cultivate under relative moisture 90% condition, check after 15 days, record survival number, carries out statistical analysis with DPS data processing software, calculating regression curve, obtains LC ₅₀, adopt the abundant co-toxicity coefficient method (CTC) waiting nineteen sixty to propose of Sun Yun to evaluate the synergistic effect of pharmacy mix.The computing formula of co-toxicity coefficient is as follows:

Actual measurement toxicity index (ATI)=(standard agent LC ₅₀/ reagent agent LC ₅₀) × 100

In theoretical toxicity index (TTI)=A medicament ATI × mixture A percentage composition+B medicament ATI × mixture in the percentage composition of B

Co-toxicity coefficient (CTC)=(mixture ATI/ mixture TTI) × 100

When CTC≤80, composition shows as antagonism, and as 80 < CTC < 120, composition shows as summation action, and when CTC >=120, composition shows as synergistic effect.

Result of the test is in table 1.

Table 1 Avermectin, Hexythiazox, flufenoxuron and different ratio are to the toxicity test (15 days) of Tetranychus urticae

From table 1, when the weight ratio of Avermectin, Hexythiazox and flufenoxuron carries out mixture between 1-2: 3-8: 5-10, each proportioning co-toxicity coefficient all reaches more than 120, and the virulence of composition to oranges and tangerines Tetranychus urticae shows as significantly coordinates synergistic effect.

The compound method of embodiment 2:8% abamectin hexythiazox flufenoxuron microemulsion and medicament field trial

By recipe requirements, by the amount of above component through dissolving completely and mixing, obtained 8% abamectin hexythiazox flufenoxuron microemulsion after stirring.

This embodiment preparation, for preventing and treating oranges and tangerines Tetranychus urticae, adopts conventional method to carry out even spraying, drips for standard with blade face.During dispenser, field Tetranychus urticae is more.4 process are established in test altogether, and each process repeats for 4 times.Before dispenser, investigate field insect population radix, within after medicine 1 day, 7 days and 21 days, investigate residual borer population of living respectively, during investigation, 2 strains are looked in each community, every strain looks into 5 leaves respectively by orientation, 4, the four corners of the world, every community looks into 40 leaves altogether, records mite number of living, carries out control efficiency statistics.

Preventive effect computational methods:

In formula: PT ₀---before-----treatment region medicine; PT ₁after-----treatment region medicine

CK ₀---before the medicine of-----check plot; CK ₁after the medicine of-----check plot

Table 2 8% abamectin hexythiazox flufenoxuron microemulsion is to the field trial chart of Tetranychus urticae

As shown in Table 2, after Avermectin, Hexythiazox and flufenoxuron ester are composite, built agent uses relative to single dose and improves a lot to the control efficiency of oranges and tangerines Tetranychus urticae, the effect of 1 day after medicine, quick-acting significantly improves, and after medicine, after 21 days, preventive effect is still higher, illustrate that the lasting period of mixture is better, can spraying times be reduced like this, thus more saving of labor can economize this, reduce the harmful effect to environment and residue of pesticide.

The compound method of embodiment 3 20% abamectin hexythiazox flufenoxuron aqueous emulsion and medicament field trial

Take 2% Avermectin, 6% Hexythiazox, 12% flufenoxuron, 7%N, N-dimethylformamide (emulsifier), 3% dense newborn 500 ^#(emulsifier), lignosulfonates 2% (dispersant), 0.08% silicone oil (defoamer), deionized water add to 100%, the obtained 20% abamectin hexythiazox flufenoxuron aqueous emulsion of mixing.

This embodiment preparation is for preventing and treating oranges and tangerines Tetranychus urticae, and during dispenser, field Tetranychus urticae is more, and 4 process are established in test altogether, and each process repeats for 4 times, adopts spray method, insect survey mode and the drug effect computational methods identical with embodiment 2 field trial.

Result of the test is in table 3.

Table 3 20% abamectin hexythiazox flufenoxuron aqueous emulsion is to the field trial table of Tetranychus urticae

Field trial shows: 20% abamectin hexythiazox flufenoxuron aqueous emulsion has significant control efficiency to citrus red mite, its control efficiency of 20000 times is obviously better than contrast medicament 2% abamectin aqueous emulsion 3000 times, 5% Hexythiazox aqueous emulsion 3000 times, 5% flufenoxuron aqueous emulsion 3000 times, after showing Avermectin, Hexythiazox and flufenoxuron mixture, significantly improve the control efficiency to two spotted spider mite, composition all has significant improvement than single dose from the persistence of quick-acting and drug effect, greatly reduce dosage, saving of labor economizes this more.Each medicament of process of the test is to Ci trus growth safety.

In sum, composition of the present invention is employing 3 kinds of active component compound schemes, its activity and miticidal effect are not the simple superposition of each composition activity, compared with existing unitary agent, except there is significant miticidal effect, and there is significant synergistic effect, quick-acting is high, lasting effect is long, the generation of two spotted spider mite resistance can be slowed down, good to crop safety, meet the security requirement of pesticidal preparations.

Claims

1. prevent and treat a method for citrus red mite, it is characterized in that, be 1-2: 3-8: 5-10 carry out medicament mixture by Avermectin, Hexythiazox and flufenoxuron according to active ingredient weight ratio, be then watered dilution, even spraying is on Citrus leaf.

2. the method for control citrus red mite according to claim 1, it is characterized in that, described Avermectin, Hexythiazox and flufenoxuron and adjuvant are mixed with microemulsion or aqueous emulsion.