Effective control of tomato gray mold by chemical control, but in recent years, gray mold bacteria have gradually developed resistance to commonly used pesticides such as thiophanate-methyl and procymidone. Related data show that pyridine azole has good preventive, therapeutic and systemic conductivity, which can effectively inhibit mycelial growth, spore germination and germ tube elongation of gray mold pathogen, and the conventional fungicide thiophanate-methyl The mechanism of action such as procymidone is different, and there is no cross-resistance. In the year of 2009, the agricultural department of Wujiang City carried out a field efficacy test using 25% pyridine emulsifiable concentrate to control tomato gray mold, and achieved good results.
The test was carried out in a tomato greenhouse. The test reagent was 25% pyridine emulsifiable concentrate, 50% procymidone wettable powder and 70% thiophanate-methyl wettable powder, of which 25% pyridine emulsifiable concentrate was set at 750 times. 1000 times liquid, 1500 times liquid, 3 different concentrations of treatment, 50% procymidone WP and bactericide 70% thiophanate-methyl WP can be treated with 1000 times solution. In the fruiting period of tomato flowering, 60 kg of spray liquid per acre, once every 7 days, 3 times in 2009, 4 times in 2010.
The test data showed that 25% pyridine emulsifiable concentrate had good control effect against Botrytis cinerea, among which 750 times solution had the highest control effect, and the two-year control effect was 94.7% and 94.4% respectively; 1000 times liquid was the second. The two-year control effect was 89.5% and 87.5%, respectively, which were significantly better than 50% Pythium WP and 70% thiophanate-methyl WP (the two-year control effect was 79.7%, 82.1%, respectively). And 69.5%, 70.2%); 25% bacteriozin 1500 times solution treatment for two years of 83.3% and 78.5%, respectively, and 50% Pythium WP 1000 times solution is similar, better than 70% thiophanate-methyl WP 1000 times solution.
The above tests showed that 25% piperidine ipconazole EC Botrytis cinerea control effect was better than 50% procymidone wettable powders and 70% thiophanate-methyl wettable powder, so pesticide manufacturers recommended recommended ~ 750 1000 times liquid (60-100 ml per acre, when the incidence is serious, the dosage can be appropriately increased) spray, master the drug in the early stage of gray mold, once every 7 days, continuous control 3 to 4 times. In order to be able to produce bacterial resistance, it is better to use the drug in combination with other fungicides.
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