CN103053547B - Bactericidal composition of boscalid and hymexazol - Google Patents

Abstract

The invention discloses a bactericidal composition of boscalid and hymexazol. The effective component of the bactericidal composition is composed of boscalid and hymexazol with a mass part ratio of 1:3-5:1. The bactericidal composition provided by the invention is suitable to be used for controlling cucumber fusarium wilt. The bactericidal composition provided by the invention has a substantial synergetic effect, and has a substantial controlling effect against cucumber fusarium wilt. The composition is easy to use, and has high operability and actual application value.

Description

Boscalid is with hymexazo bactericidal composition

Technical field

The present invention relates to pesticidal preparations field, be specifically related to Boscalid with hymexazo bactericidal composition, for preventing and treating cucumber fusarium axysporum.

Background technology

Fusarium wilt is many in the hinterland supervention disease of yielding positive results, and the lateral lobe sheet that killed strain shows as partial blade or plant is at first wilted sagging noon, like lack of water shape, sooner or later can recover, wilting blade is on the increase later, spreads all over gradually complete stool, sooner or later can not restore, and withered very soon.The climing base portion lobe of diseased plant master, the sick stem of rip cutting, visible vascular bundle browning.There is yellowish-brown streak in basal part of stem, joint and internode, often has yellow jelly to flow out, and when moist, disease portion surface produces white to the mould layer of pink, and diseased plant is easily pulled up.Cucumber fusarium axysporum is fungus-caused disease, germ survives the winter on soil, invalid body and seed with mycelium, sclerotium and chlamydospore, in soil, can survive 5-6 or longer time, germ is with propagation such as seed, soil, fertilizer, irrigation water, insect, farm implements, invade by root wound, the more diseases of continuous cropping number of times are heavier.Soil high humidity, root ponding, high temperature are conducive to disease and occur, and nitrogenous fertilizer too much, acid, soil insect and the many plot diseases of root-knot nematode occur heavy.

Boscalid, English name Cantus, belongs to Novel tobacco acid amide fungicides, is mainly used in preventing and treating powdery mildew, gray mold, various rot, brown rot and root rot etc.Boscalid belongs to succinic acid ubiquinone reductase inhibitor in mitochondrial respiratory chain, and the sprouting of spore is had to very strong inhibition ability, and with other bactericide without cross resistance.Permeated in plant and shifted by blade face, suppress mitochondrial succinate ester dehydrase, hinder tricarbonic acid cycle, amino acid, sugar shortage, energy are reduced, the division of interference cell and growth, have protection and therapeutic action.

Hymexazo is a kind of bactericide, soil disinfectant of high-efficiency low-toxicity environmental protection, is again a plant growth regulators simultaneously.There is interior absorption and conductivity, can directly be absorbed by plant root, and rapidly mobile in plant corpus; In soil, can improve drug effect, and the lasting period is long, uses in two weeks and still have bactericidal activity.Mechanism of action uniqueness, efficient, micro-poison, nuisanceless, can effectively suppress the mycelial normal growth of disease fungus or direct killing pathogenic bacteria.To fusarium wilt, damping off, verticillium wilt, damping off, banded sclerotial blight, seedling rot, stalk break, epidemic disease, dry rot, scab, sclerotium soft rot, seedling blight, stem wilt, leaf blight, macerate root, continuous cropping continuous cropping obstacle has special efficacy.And have that the crop root of promotion grows, strong plantlets and rootage improves the effect of survival rate.

The mixture of different pesticide species is common methods of the agriculture resistance disease of control.Screening by formulation of pesticide, filter out rational formula, can effectively improve actual control efficiency, reduce dosage, reduce costs, delay the generation of disease drug resistance, is the important means of the disease comprehensive regulation.Boscalid is with hymexazo mixture has obvious synergistic effect.

Have no Boscalid at present with the report of hymexazo mixture.

Summary of the invention

The object of the invention is the Boscalids different mechanism of action, with hymexazo carries out compositely, provides the composition pesticide of a kind of efficient, low toxicity, low-residual, for preventing and treating cucumber fusarium axysporum.

Technical scheme of the present invention: taking Boscalid with hymexazo is active ingredient, Boscalid is with the ratio of quality and the number of copies of hymexazo in composition is 1:3～5:1, and all the other are to allow in agricultural chemicals to use and acceptable auxiliary element.

Bactericidal composition of the present invention can adopt known method to be prepared into suspending agent, water dispersible granules.

The auxiliary agent using in the present composition comprises that surfactant, dispersant, filler, filler etc. and other are of value to the known substance of active ingredient stable and performance drug effect in preparation, all various compositions conventional in pesticidal preparations or that permission is used, be not particularly limited, concrete composition and consumption require to determine by simple test according to formula.

Product described in the invention can finished product preparation form provide, in composition, each material mixes, the form that the composition of composition also can single dose provides, and before use, directly in tank or bucket, mixes, and is then diluted to needed concentration.The frequency of administration of the present composition and amount of application change with weather condition and crop state variation, can be by using suitable formulation to reach the object of control.

Beneficial effect of the present invention is: 1, two kinds of active ingredient is composite has an obvious synergistic effect, has improved control efficiency; 2, two kinds of active ingredients are composite, there is not cross resistance in mechanism of action uniqueness, has reduced agricultural chemicals usage amount, thereby reduced cost and reduced the pollution to environment, be conducive to the resistance management of disease, it is applied has larger economic benefit and social benefit.

Technology origin of the present invention: with the composite synergy type to cucumber fusarium axysporum pathogenic bacteria of the compositions such as hymexazo, the inventor has carried out a large amount of Toxicity Determination experimental studies, is specifically summarized as follows in order further to understand Boscalid.

Test method: by former Boscalid Yao with the former medicinal acetone solution of hymexazo is mixed with required test medicine.Under aseptic technique, process the sterilising medium melting in advance is quantitatively added in aseptic conical flask according to test, quantitatively add successively the liquid of each mixed ratio, add respectively in above-mentioned conical flask, fully shake up.Then equivalent is poured in the culture dish that 4 diameters are 9cm, makes the pastille flat board of respective concentration.The bacterium cake that the colony edge cut-off footpath of cultivating 5d from oat medium is 5mm, is inoculated in respectively above-mentioned pastille flat board, and test is established the not processing containing medicament and made blank, and every processing repeats for 4 times.Under 26 DEG C of dark conditions, cultivate 5 days, measure colony diameter, calculate the inhibiting rate (%) of each concentration medicament to mycelial growth.

Calculate the toxicity index of each medicament and the co-toxicity coefficient of mixture (CTC value) according to the abundant method of Sun Yun, when CTC≤80 are antagonism, 80 ﹤ CTC ﹤ 120 are summation action, and CTC >=120 are synergistic effect.

Result of the test is with reference to table 1.As can be seen from the test results, Boscalid, with the composite mass ratio of hymexazo, between 1:3～5:1, all has very strong inhibitory action to cucumber fusarium axysporum colony growth, can effectively suppress the expansion of bacterium colony.

Table 1, Toxicity Determination result of the test to cucumber fusarium axysporum.

Embodiment

In order to understand better essence of the present invention, be described further by following examples, but the present invention is not limited to these embodiment.In these embodiments, unless otherwise indicated, all percentage is mass percent.

embodiment 1: 40% pyridine acyl Jun An hymexazo suspending agent.

Boscalid 30% hymexazo 10%, methyl naphthalene sulfonate formaldehyde condensate (dispersant) 5%, 0203B(surfactant) 6%, white carbon (filler) 5%, aluminium-magnesium silicate (suspending agent) 0.4%, ethylene glycol (antifreezing agent) 3%, tributyl phosphate (defoamer) 1.5%, deionized water complements to 100%.Above-mentioned raw materials, through mixing, after high speed shear is disperseed, makes 40% pyridine acyl Jun An hymexazo suspending agent after grinding with skin grinder.

Adopt above-mentioned 40% pyridine acyl Jun An hymexazo suspending agent control cucumber fusarium axysporum, transplant to be watered for latter 7 days be diluted to 800 times of liquid irrigating root dispensers in cucumber, after medicine, 7d preventive effect is 92.7%.Taking 1400 times of liquid of 70% hymexazo wetting powder, 500 times of liquid of 50% Boscalid water dispersible granules as contrast medicament, adopt same method dispenser, after medicine, 7d preventive effect is respectively 80.2%, 86.3%.Test shows that 40% pyridine acyl bacterium amine hymexazo suspending agent has good control efficiency to cucumber fusarium axysporum, and preventive effect is better than contrasting single dose.

embodiment 2: 60% pyridine acyl Jun An hymexazo water dispersible granules.

Boscalid 15% ， hymexazo 45%, lauryl sodium sulfate %(wetting agent), CMC (dispersant) 5%, bentonite (disintegrant) 3%, polyethylene glycol (binding agent) 2%, gum Arabic (stabilizing agent) 1%, white carbon complements to 100%.By above-mentioned formula, dry pulverization process, granulation, dry, screening make 60% pyridine acyl Jun An hymexazo water dispersible granules in proportion.

Adopt above-mentioned 60% pyridine acyl Jun An hymexazo water dispersible granules control cucumber fusarium axysporum, transplant to be watered for latter 7 days be diluted to 1000 times of liquid irrigating root dispensers in cucumber, after medicine, 7d preventive effect is 95.2%.Taking 1400 times of liquid of 70% hymexazo wetting powder, 500 times of liquid of 50% Boscalid water dispersible granules as contrast medicament, adopt same method dispenser, after medicine, 7d preventive effect is respectively 83.7%, 85.9%.Test shows that 60% pyridine acyl bacterium amine hymexazo water dispersible granules has good control efficiency to cucumber fusarium axysporum, and preventive effect is better than contrasting single dose.

More than comprehensive, Boscalid of the present invention, with hymexazo bactericidal composition is obvious to cucumber fusarium axysporum synergistic effect, has good control efficiency, is the one pesticide species that is worth of widely use.

Claims (2)

1. Boscalid and a hymexazo bactericidal composition, is characterized in that: active ingredient is made up of Boscalid and hymexazo, Boscalid and the hymexazo ratio of quality and the number of copies in composition is 1:3～5:1.

2. a Boscalid claimed in claim 1 and hymexazo bactericidal composition are as the application of control cucumber fusarium axysporum.