Tomato gray mold is one of the most important diseases of tomato cultivation in greenhouses. It is very cold and humid, and the indoor and outdoor climate in winter and spring is very suitable for its development. In recent years, with the increase of drug resistance of pathogens, prevention and treatment have become more and more difficult. According to the results of the experimental demonstration and promotion, the traditional prevention and control methods must be improved in eight aspects in order to achieve a better overall control effect.
1 The removal of petal petals and stigma is the site of initial infestation by Botrytis cinerea, which gradually develops to young fruit as the disease progresses. The diseased petals fall on the leaves and often cause disease. Therefore, the removal of the remaining petals and stigma in the timely setting of tomatoes can block the initial infestation of Botrytis cinerea.
2 High-temperature sheds regulate the temperature and humidity to create an ecological environment conducive to the growth of tomatoes that is not conducive to the occurrence of gray mold. In the morning, the greenhouse temperature was raised to 31-33Â°C and reached 34Â°C. Noon release, so that the afternoon temperature dropped below 25 Â°C, closed at 20 Â°C vents. Keep 13 to 15Â°C at night. To water in the sunny morning, close the greenhouse immediately after watering, and let the air blow out at 33Â°C for 1 hour.
3 Spraying with Medicago will accelerate the transmission of Botrytis cinerea, and spray treatment can be carried out with 10 ~ 25mg/L anti-dropping liquid, and 0.1% of deminoxifene is added thereto. When a tomato blossoms 2 to 3 flowers on a flowering spike, spray it once, and about 50% of the flowers are sprayed again.
4 Before spraying watering, it is easy to cause serious disease after watering, and the rotting fruit is serious. Therefore, it is necessary to spray the medicine before watering the next day. The focus of spraying is on flowers and young fruit.
5 With the transplanting seedlings transplanted at the seedling stage, the resistance of the plants is reduced, and the pathogens are easily infested. Therefore, the seedlings must be applied one day before the seedlings are transplanted to enhance the resistance of the plants.
6 Alternate application of new pesticides Imported pesticides such as 50% fast keratin and 50% fluocin, which have been used for many years, have developed drug resistance. Should try to use new pesticides alternately, such as 25% puruflu, 28% gray mold grams, 50% chlorimurine, Terek and so on.
7 Spraying dust can avoid the increase of humidity caused by spraying to the greenhouse. 10% extinction grams, 5% chlorothalonil or 10% chloramphenicol or 10% grey mold may be selected and sprayed in the evening.
8 Smoke application In case of continuous rain (snow), 10% fast keratin or 45% chlorothalonil may be used, and 250g per 667m 2 may be smoked in the evening.
Cas 143782-23-4,Enzalutamide Intermediates,6-Bromo-2-Chloro-8-Cyclopentyl
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