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Bactericidal composition for controlling main fungal diseases of pears and application thereof

A technology of fungal diseases and compositions, which is applied in the field of fungicidal compositions for the prevention and treatment of main fungal diseases of pears, to achieve the effects of reducing pollution, improving utilization efficiency and duration, and expanding the spectrum of disease prevention

Inactive Publication Date: 2020-02-11
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, there have been no reports on the use of flusilazole and pyraclostrobin as the main active ingredients, and chitosan quaternary ammonium salts as film-forming slow-release aids and inducers to control crop diseases.

Method used

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  • Bactericidal composition for controlling main fungal diseases of pears and application thereof
  • Bactericidal composition for controlling main fungal diseases of pears and application thereof
  • Bactericidal composition for controlling main fungal diseases of pears and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Indoor bioassay of flusilazole and pyraclostrobin compounded against black spot fungus of pear

[0024] Using the mycelial growth rate method in the room, measure the EC50 value of different agents inhibiting the mycelial growth of Pyrethia spp., and use the co-toxicity coefficient calculation method to calculate the co-toxicity coefficient (CTC) of the mixture to determine the synergy of the mixture , the specific calculation method is as follows:

[0025] Use a single agent in the mixture as the standard agent (usually EC 50 The lower one), the other single agent is the test drug, and the calculation is performed:

[0026] Single dose toxicity index = standard dose EC 50 / Test agent EC 50 ×100

[0027] Theoretical toxicity index (TTI) = Toxicity index of A single dose × Proportion of A single dose in the mixture + Toxicity index of B single dose × Proportion of B single dose in the mixture

[0028] Actual Toxicity Index (ATI) = EC of a standard single ...

Embodiment 2

[0035] Example 2 Indoor bioassay of flusilazole and pyraclostrobin compounded against Pyrethria spp.

[0036] The mycelial growth rate method was used indoors to measure the EC of the optimal ratio combination of flusilazole and pyraclostrobin 1: 1 and 2: 1 inhibiting the mycelial growth of R. 50 value, adopt the co-toxicity coefficient calculation method, calculate the co-toxicity coefficient (CTC) of the mixture, determine the synergism of the mixture, and the specific calculation method is carried out with reference to the method in embodiment 1.

[0037] Table 2 Indoor bioassay results of the inhibitory effect of flusilazole and pyraclostrobin on different ratios of pyraclostrobin

[0038]

[0039] The above laboratory bioassay results showed that flusilazole and pyraclostrobin had a synergistic effect on the inhibition of mycelia growth of R. 153.98, 154.15.

Embodiment 3

[0040] Example 3 Indoor bioassay of pear anthracnose bacteria compounded with flusilazole and pyraclostrobin

[0041] Using the mycelial growth rate method indoors, the EC of the optimal ratio combination of flusilazole and pyraclostrobin 1: 1 and 2: 1 in Example 1 inhibiting the mycelial growth of pear anthracnose 50 value, adopt the co-toxicity coefficient calculation method, calculate the co-toxicity coefficient (CTC) of the mixture, determine the synergism of the mixture, and the specific calculation method is carried out with reference to the method in embodiment 1.

[0042] Table 3 Indoor bioassay results of different ratios of flusilazole and pyraclostrobin on the inhibition of pear anthracnose

[0043]

[0044] The above laboratory bioassay results showed that when flusilazole and pyraclostrobin were compounded at a ratio of 2:1, their inhibitory effects on the mycelial growth of P. pear anthracnose were additive, and the co-toxicity coefficient (CTC) was 99.77.

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Abstract

The invention discloses a bactericidal composition for controlling main fungal diseases of pears and application thereof. The bactericidal composition adopts flusilazole, pyraclostrobin and a chitosanquaternary ammonium salt as the main components, according to different action mechanisms of flusilazole and pyraclostrobin, combines the induced disease resistance and the film-forming properties ofchitosan quaternary ammonium salt, and is assisted by appropriate auxiliary assistants, wherein the chitosan quaternary ammonium salt accounts for 50% of the mass of the main components, and the massratio of flusilazole to pyraclostrobin is 1:10-10:1. The bactericidal composition shows a synergistic effect in the above proportion range, has the characteristics of high efficiency, low toxicity, broad spectrum, long lasting period and low application cost, meanwhile delays the drug resistance of pathogenic bacteria, and reduces the dosage of chemical fungicides. The bactericidal composition can be used for controlling main fungal diseases of pears, especially pear black spot, pear scab, pear anthracnose, pear rust, pear fruit ring rot and other fungal diseases, and has obviously superior control effects to corresponding single agents and conventional compounding agents.

Description

technical field [0001] The invention belongs to the technical field of pesticides, and in particular relates to a fungicidal composition for preventing and treating main fungal diseases of pears and an application thereof. Background technique [0002] Pears are the third largest fruit in my country after apples and citrus, with a cultivated area of ​​about 1.15 million hectares and an output of over 16 million tons, ranking first in the world. In the process of breeding and popularizing pear varieties, quality (including nutritional value, taste, appearance and morphological characteristics, etc.) is given top priority, and the disease resistance characteristics of varieties are secondly considered. In addition, pear trees are perennial crops, resulting in abundant pathogenic bacteria in the field, especially fungal diseases such as pear black spot, pear anthracnose, pear ring spot, pear rust, and pear scab. Recession, production decline, and greatly reduced the commodity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N55/10A01N47/24A01N43/16A01N25/00A01P3/00
CPCA01N25/00A01N43/16A01N47/24A01N55/00
Inventor 赵延存刘凤权孙伟波徐会永李朝辉贾艺凡
Owner JIANGSU ACAD OF AGRI SCI
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