阅读说明：本技术 一种用于防治火龙果褐腐病的含戊唑醇和咯菌腈杀菌剂组合物及其应用 (Bactericide composition containing tebuconazole and fludioxonil for preventing and treating pitaya brown rot and application thereof ) 是由 蓝国兵 何自福 佘小漫 于琳 汤亚飞 李正刚 邓铭光 于 2019-08-28 设计创作，主要内容包括：本发明公开了一种用于防治火龙果褐腐病的含戊唑醇和咯菌腈杀菌剂组合物及其应用,所述一种抗火龙果褐腐病的杀菌剂组合物,含有质量比为1：9到9：1的戊唑醇和咯菌腈。本发明采用戊唑醇和咯菌腈两种药剂的复配,能够有效缓解病菌抗药性的产生。通过室内毒力测定和田间药效试验研究显示,戊唑醇和咯菌腈进行组合应用对火龙果褐腐病有良好的防治效果,其对作物安全,有增效作用,能够减少农药用量,延缓抗药性产生。(The invention discloses a bactericide composition containing tebuconazole and fludioxonil for preventing and treating dragon fruit brown rot and application thereof, wherein the bactericide composition for preventing and treating dragon fruit brown rot contains the following components in a mass ratio of 1:9 to 9:1 tebuconazole and fludioxonil. The invention adopts the combination of tebuconazole and fludioxonil, and can effectively relieve the drug resistance of pathogenic bacteria. Indoor toxicity measurement and field pharmacodynamic test research show that the tebuconazole and fludioxonil are combined and applied to control the pitaya brown rot, have good control effect, are safe to crops, have a synergistic effect, can reduce the using amount of pesticides and delay the generation of drug resistance.)

1. The bactericide composition for preventing and treating the pitaya brown rot is characterized by comprising the following components in percentage by mass: 9 to 9:1 tebuconazole and fludioxonil.

2. The bactericide composition as claimed in claim 1, wherein the mass ratio of tebuconazole to fludioxonil is 8:2 to 5: 5.

3. use of the fungicide composition according to claim 1 or 2 for the preparation of a medicament for the control of pitaya brown rot.

4. A medicament for preventing and treating dragon fruit brown rot, which is characterized by comprising 30-45% of the bactericide composition of claim 1 or 2 by mass fraction.

5. The agent according to claim 4, which comprises 45% by mass of the fungicidal composition according to claim 1 or 2.

6. The medicament according to claim 4, which further comprises an auxiliary agent, wherein the auxiliary agent comprises one or more of an emulsifier, a wetting agent, a dispersing agent, a thickening agent, a suspending agent, an antifoaming agent, a preservative, or an antifreezing agent.

Technical Field

The invention relates to the technical field of plant protection, and particularly relates to a bactericidal agent composition containing tebuconazole and fludioxonil for preventing and treating pitaya brown rot and application thereof.

Background

Pitaya (Hylocereus undatus) is a perennial fleshy plant of Cactaceae family, genus Petasites, and is native to Central America, such as Brazil, Mexico, and the like. In the early 90 s of the 20 th century, Taiwan in China introduced into mainland after successful introduction of a test species. At present, the dragon fruits are planted in large areas in places such as Guangxi, Guangdong, Hainan, Fujian, Guizhou, Yunnan and the like in China, and the dragon fruits become one of important economic crops for farmers to lose poverty and become rich.

The brown rot, also called canker, of dragon fruit caused by the infection of new phaeosporium dimyridum is a devastating fungal disease that seriously threatens the development of the dragon fruit industry. The disease causes the fruit peel to be pitted so as to reduce the commodity value, and causes the stalks and the fruits to be rotten and dead so as to cause the average yield loss to be generally 20 to 30 percent and to be more than 50 percent when the disease is serious, even the garden is damaged. At present, the prevention and treatment of the pitaya brown rot mainly depends on chemical pesticides, but the selection of medicaments with good prevention effect is not many.

The inventor selects 6 bactericides such as iprodione, flusilazole, tebuconazole, propiconazole, prothioconazole and fludioxonil from more than 20 bactericides, has good activity, long in-vitro bacteriostasis duration and good control effect in a field efficacy test. The invention aims to provide a bactericidal composition which has obvious effect of preventing and controlling the brown rot of pitaya, is safe to crops, has a synergistic effect and no cross resistance and has different bactericidal action mechanisms. By combining the sterilization action mechanism and the field control effect performance of the 6 bactericides, tebuconazole and fludioxonil are preferably selected as the sterilization composition for the brown rot of the dragon fruit.

Tebuconazole, english name: tebuconazole, CAS number: 107534-96-3, chemical name: (RS) -1- (4-chlorophenyl) -4, 4-dimethyl-3- (1H-1,2,4 triazol-1-ylmethyl) pentan-3-ol, molecular weight: 307.8, formula: c₁₆H₂₂CLN₃And O. Tebuconazole is a triazole bactericidal pesticide with high efficiency, broad spectrum and systemic propertyThe biological synthesis of ergosterol of fungus is inhibited to achieve the aim of sterilization, and the bactericidal composition has three functions of protection, treatment and eradication, and has wide bactericidal spectrum and long lasting period. Fludioxonil, english name: fludioxonil, CAS No.: 131341-86-1, chemical name: 4- (2, 2-difluoro-1, 3-benzodioxo-4-yl) pyrrole-3-carbonitrile, molecular weight: 248.18, formula: c₁₂H₆F₂N₂O₂. Fludioxonil ultimately leads to pathogen death by inhibiting glucose phosphorylation-related transfer and inhibiting the growth of fungal mycelia. The action mechanism is unique, and the bactericide has no cross resistance with the existing bactericide.

At present, no bactericide registered for preventing and treating the pitaya brown rot exists in the market, and the bactericide composition can be used for chemical prevention and treatment of the pitaya brown rot. In production, farmers often mix a plurality of medicaments, and blindly increase the pesticide application concentration, so that the pesticide dosage is increased, the environmental pollution is aggravated, and the development of the dragon fruit planting industry is not facilitated.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a bactericidal agent composition containing tebuconazole and fludioxonil for preventing and treating the brown rot of dragon fruits and application thereof.

The invention aims to provide a bactericide composition for preventing and treating the brown rot of pitaya.

The second purpose of the invention is to provide the application of the bactericide composition in preparing a medicament for preventing and treating the brown rot of the dragon fruit.

The third purpose of the invention is to provide a medicament for preventing and treating the dragon fruit brown rot.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention claims a bactericide composition for preventing and treating dragon fruit brown rot, which comprises the following components in percentage by mass: 9 to 9:1 tebuconazole and fludioxonil.

Pityrosporum ovale is a new phaeocaulospora tarkii which can infect stems and fruits of pitaya, and is a fungal disease.

Preferably, the mass ratio of the tebuconazole to the fludioxonil is 8:2 to 5: 5.

the application of the bactericide composition in preparing a medicament for preventing and treating the pitaya brown rot also belongs to the protection scope of the invention.

The invention also claims a medicament for preventing and treating the pitaya brown rot, which contains 30-45 mass percent of the bactericide composition.

Preferably, the bactericide composition is contained in an amount of 45 mass%.

Preferably, the disinfectant also contains an auxiliary agent, wherein the auxiliary agent comprises one or more of an emulsifying agent, a wetting agent, a dispersing agent, a thickening agent, a suspending agent, an antifoaming agent, a preservative or an antifreezing agent.

According to different choices of the auxiliary agents, the medicament can be prepared into a suspending agent or an aqueous emulsion.

Preferably, the emulsifier is: the agricultural milk 600-3#, the agricultural milk 600-1#, the agricultural milk BY-140 and the agricultural milk BY-120.

More preferably, the emulsifier is agricultural milk 600-3 #.

Preferably, the wetting agents are: one or more of triphenyl ethyl phenol phosphate, fatty alcohol polyoxyethylene ether phosphate, propylene-ethylene block copolymer and styryl phenol polyoxyethylene ether formaldehyde condensate.

More preferably, the wetting agent is a propylene-ethylene block copolymer.

Preferably, the dispersant is: a mixture of one or more of a polycarboxylate, a lignosulfonate.

More preferably, the dispersant is a polycarboxylate.

Preferably, the defoaming agent is: isooctyl alcohol and one or more of organosilicon compounds.

More preferably, the antifoaming agent is isooctanol.

Preferably, the suspending agent is: one or more of white carbon black, magnesium aluminum silicate and polyvinyl alcohol.

More preferably, the suspending agent is magnesium aluminum silicate.

Preferably, the thickener is: xanthan gum, hydroxymethyl cellulose, hydroxyethyl cellulose.

More preferably, the thickener is xanthan gum.

Preferably, the preservatives are: one or more of sodium benzoate and cason.

More preferably, the preservative is cason.

Preferably, the anti-freezing agent is: one or more of ethylene glycol, propylene glycol and urea.

More preferably, the antifreeze is ethylene glycol.

Compared with the prior art, the invention has the following beneficial effects:

(1) the composition has high bacteriostatic activity on the dragon fruit brown rot, has good control effect on the dragon fruit brown rot in the field, has the bactericidal effect obviously superior to that of a single agent, reduces the using dosage of pesticide, and reduces the pollution to the environment.

(2) The main effective components of the composition of the invention, namely the tebuconazole and the fludioxonil have different sterilization action mechanisms, and the composition is beneficial to reducing the drug resistance risk of pathogenic bacteria after being mixed.

(3) The composition is safe to pitaya, does not influence the growth and fruit bearing of crops, has long efficacy duration, and is particularly suitable for being used in high-temperature rainy seasons.

(4) The young tips of the dragon fruits have poor resistance to the brown rot germs of the dragon fruits, and the tebuconazole can be quickly absorbed by the growing parts of the plants and mainly transferred to the top after being sprayed, so that the young tips of the dragon fruits can be well protected from being infected by the brown rot germs, the young tips can be well protected, and the good prevention and control effect is shown. Fludioxonil has high bacteriostatic activity and long residual period, can effectively inhibit pathogenic bacteria on disease residues, and reduces the source of initial infection.

The compound preparation adopts the combination of tebuconazole and fludioxonil, can achieve good control effect on the pitaya brown rot, and is beneficial to reducing the risk of drug resistance of pathogenic bacteria. The inventor shows that the tebuconazole and the fludioxonil are combined and applied to have good control effect on the dragon fruit brown rot through indoor toxicity determination and field pharmacodynamic test research, are safe to crops, can reduce the using amount of pesticides and delay the generation of drug resistance.

Detailed Description

The present invention is further described in detail in the following description and specific examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the invention. The test methods used in the following examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are, unless otherwise specified, commercially available reagents and materials.