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Control method of cucumber downy mildew

A technology for cucumber downy mildew and disease, which is applied in the directions of botanical equipment and methods, chemicals for biological control, animal repellents, etc. The effect of saving cultivation cost and labor cost, reducing the frequency and dosage of medication, and improving disease resistance

Active Publication Date: 2013-11-27
INST OF PLANT PROTECTION SHANDONG ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chemical pesticides are mainly used for the prevention and control of cucumber downy mildew, for example: 72% Prequel water 800 times liquid, 72% Kelu WP 600 times liquid, 90% Impostrin wettable powder 400-500 times liquid, 25% metalaxyl wettable powder 800-1000 times liquid, 75% chlorothalonil wettable powder 600 times liquid, 69% Anke manganese zinc wettable powder 600 times liquid, etc., most of them are common chemical agents, with heavy residues, It affects the quality of cucumbers and cannot meet the requirements of pollution-free production; and farmers are accustomed to using the same pesticide for a long time, which is prone to resistance, and the control effect is reduced. Vegetables and soil pesticide residues are serious, forming a vicious circle, seriously threatening and affecting people's health and environmental safety

Method used

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  • Control method of cucumber downy mildew
  • Control method of cucumber downy mildew
  • Control method of cucumber downy mildew

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Indoor efficacy test of mandipropamid and chitosan against cucumber downy mildew.

[0027] Using the leaf disc method, prepare mandipropamid and chitosan into liquids with concentrations of 100ppm, 50ppm, 10ppm, 1ppm, and 0.1ppm, and directly immerse the leaf discs (d=1.5cm) into different concentrations of mandipropamid and chitosan liquid, among which three leaf disks were immersed in mandipropamid liquid and chitosan liquid successively, with 10 leaf disks for each concentration; after drying, each leaf disk was dripped with 60 μl sporangia suspension . Put it in a constant temperature incubator at 21°C for moisturizing culture, observe after 5 days, record the number of leaf discs with lesions, calculate the inhibition rate, and analyze the EC 50 and its confidence interval.

[0028] Table 1 Mandipropamid and chitosan control downy mildew

[0029]

[0030] As can be seen from Table 1, in the indoor efficacy test of mandipropamid and chitosan on cucumber downy ...

Embodiment 2

[0032] Field efficacy test of 250g / L mandipropamid suspension concentrate 1500 times solution and 60g / L chitosan water solution 800 times solution on cucumber downy mildew.

[0033] According to the occurrence characteristics of cucumber downy mildew, 8 different pesticide application schemes were designed (see Table 2). The test site was selected from Dezhou, and the cucumber variety was Jinyou 36, which were used on two seasons of cucumbers in spring and autumn. Arranged in random blocks, the area of ​​the plot is about 13.2m 2 , the spraying temperature is 15°C-25°C, and the spraying humidity is 40%-50%. The disease index and control effect are investigated before spraying and 7d and 14d after the last spraying of each scheme.

[0034] According to the Ministry of Agriculture's pesticide field test guidelines, the methods of fungicides for the control of cucumber downy mildew fungicides were investigated and analyzed.

[0035] Table 2 Implementation schemes for controlling...

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Abstract

The invention discloses a control method of cucumber downy mildew, and belongs to the field of vegetable disease control. According to the method, at the initial stage of the disease, mandipropamid liquid medicine and chitosan liquid medicine are used to perform liquid spraying at intervals, and 2-3 control periods are required, wherein each control period comprises the following steps: (1), using the mandipropamid liquid medicine with a certain concentration to perform uniform spraying; (2), after 8-12 days, using the chitosan liquid medicine with a certain concentration to perform uniform spraying. By using the method provided by the invention, downy mildew harm to cucumbers during cultivation can be effectively reduced, the using amount and times of chemical pesticides are reduced, and the method has good popularization and application value.

Description

technical field [0001] The invention relates to a method for preventing and controlling vegetable diseases, in particular to a method for preventing and controlling cucumber downy mildew. Background technique [0002] Cucumber downy mildew, commonly known as "paomagan" and "dry leaves", is a worldwide disease and a major disease that often occurs in cucumber cultivation and production. The disease mainly damages the leaves and stems, and occurs at the seedling stage. Irregular chlorotic yellow-brown spots occur on the front of the cotyledon, with a diameter of 0.2 to 0.5 cm. When it is wet, gray-brown mold occurs on the back of the lesion, and when it is severe, the cotyledon turns yellow and dries up. ; adult plant disease, first water-soaked, light green small spots appear on the reverse side of the middle and lower leaves, and the front side is not obvious, then the lesion gradually expands, the front side is exposed, the lesion turns yellowish brown, limited by the veins...

Claims

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Application Information

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IPC IPC(8): A01N43/16A01P3/00A01G13/00A01N37/36
Inventor 张博张悦丽齐军山李长松
Owner INST OF PLANT PROTECTION SHANDONG ACAD OF AGRI SCI
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