CN103053547A - 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 the hymexazo bactericidal composition

Technical field

The present invention relates to the pesticidal preparations field, be specifically related to Boscalid with the hymexazo bactericidal composition is used for the control cucumber fusarium axysporum.

Background technology

Fusarium wilt is how sick at the hinterland supervention 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 the lack of water shape, sooner or later can recover, the wilting blade is on the increase later on, spreads all over gradually complete stool, sooner or later can not restore, and very fast withered.The climing base portion lobe of diseased plant master, the sick stem of rip cutting, visible vascular bundle browning.The yellowish-brown streak appears in basal part of stem, joint and internode, often has yellow jelly to flow out, and disease section surface produces white to the mould layer of pink when moist, and diseased plant easily is pulled up.Cucumber fusarium axysporum is fungus-caused disease, germ survives the winter at 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 the 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 the 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 the mitochondrial respiratory chain, and the sprouting of spore is had very strong inhibition ability, and with other bactericide without cross resistance.Shift in plant by the blade face infiltration, 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.Have 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.The mechanism of action is unique, and efficient, little poison, nuisanceless can the mycelial normal growth of establishment 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 has an effect that promotes that crop root grows, strong plantlets and rootage improves survival rate.

Being mixed of different pesticide species is the common methods of the agriculture resistance disease of control.By the formulation of pesticide screening, filter out rational prescription, but the actual control efficiency of Effective Raise reduces dosage, reduces cost, delays the generation of disease drug resistance, is the important means of the disease comprehensive regulation.Boscalid has obvious synergistic effect with hymexazo is mixed.

Have no Boscalid at present with the report that hymexazo is mixed.

Summary of the invention

The objective of the invention is the Boscalid that the mechanism of action is different with hymexazo carries out compositely, the composition pesticide of a kind of efficient, low toxicity, low-residual is provided, be used for the control cucumber fusarium axysporum.

Technical scheme of the present invention: take 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 the agricultural chemicals to use and the 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 that uses in the present composition comprises that surfactant, dispersant, filler, filler etc. reach other and are of value to active ingredient stablizes and bring into play drug effect in preparation known substance, all be various compositions commonly used in the pesticidal preparations or that permission is used, be not particularly limited, concrete composition and consumption require to determine by simple test according to prescription.

Product described in the invention can finished product preparation form provide, namely each material mixes in the composition, the form that the composition of composition also can single dose provides, and directly mixes in tank or bucket before the use, then is 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 reach the purpose of control by using suitable formulation.

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 the agricultural chemicals usage amount, thereby has reduced cost and the pollution that has reduced environment, the resistance management that is conducive to disease, it is applied has larger economic benefit and social benefit.

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

Test method: with the former Yao of Boscalid with the former medicinal acetone solution of hymexazo is mixed with required test medicine.Under aseptic technique, process the sterilising medium that will melt in advance according to test and quantitatively add in the aseptic conical flask, quantitatively add successively the liquid of each mixed ratio, add respectively in the above-mentioned conical flask, fully shake up.Then to pour 4 diameters into be in the culture dish of 9cm to equivalent, and the pastille of making respective concentration is dull and stereotyped.The colony edge cut-off of cultivating 5d from oat medium directly is the bacterium cake of 5mm, is inoculated in respectively above-mentioned pastille dull and stereotyped, and test is established the processing that does not contain medicament and made blank, and every processing repeats for 4 times.Cultivated 5 days under 26 ℃ of dark conditions, measure colony diameter, calculate each concentration medicament to the inhibiting rate (%) of 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 can effectively suppress the expansion of bacterium colony with the composite mass ratio of hymexazo between 1:3～5:1, all has very strong inhibitory action to the cucumber fusarium axysporum colony growth.

Table 1, to the Toxicity Determination result of the test of 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 percentages are mass percent.

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

Boscalid 30% hymexazo 10%, methyl naphthalene sulfonate formaldehyde condensate (dispersant) 5%, the 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 is after mix, high speed shear is disperseed, with making 40% pyridine acyl Jun An hymexazo suspending agent after the skin grinder grinding.

Adopt above-mentioned 40% pyridine acyl Jun An hymexazo suspending agent control cucumber fusarium axysporum, transplant to be watered in rear 7 days in cucumber and be diluted to 800 times of liquid irrigating root dispensers, the 7d preventive effect is 92.7% behind the medicine.Take 1400 times of liquid of 70% hymexazo wetting powder, 500 times of liquid of 50% Boscalid water dispersible granules as the contrast medicament, adopt the same method dispenser, the 7d preventive effect is respectively 80.2%, 86.3% behind the medicine.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%.Dry pulverization process, granulation, drying, screening namely make 60% pyridine acyl Jun An hymexazo water dispersible granules in proportion with above-mentioned prescription.

Adopt above-mentioned 60% pyridine acyl Jun An hymexazo water dispersible granules control cucumber fusarium axysporum, transplant to be watered in rear 7 days in cucumber and be diluted to 1000 times of liquid irrigating root dispensers, the 7d preventive effect is 95.2% behind the medicine.Take 1400 times of liquid of 70% hymexazo wetting powder, 500 times of liquid of 50% Boscalid water dispersible granules as the contrast medicament, adopt the same method dispenser, the 7d preventive effect is respectively 83.7%, 85.9% behind the medicine.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 has good control efficiency with the hymexazo bactericidal composition is obvious to the cucumber fusarium axysporum synergistic effect, is a kind of pesticide species that is worth of widely use.

Claims (2)

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

Boscalid according to claim 1 He the hymexazo bactericidal composition it is characterized in that: be used for the control cucumber fusarium axysporum.