Common Diseases and Control Methods of PumpkinⅠ

       Pumpkin is a species of the genus Cucurbita in the gourd family. It is an annual vine herb native to Mexico and Central America. It was introduced to China in the Ming Dynasty and is now widely cted throughout the North and South. Its fruit is used as a food source and also as a food substitute.
　　1.Pumpkin powdery mildew
　　The disease is caused by the infection of cucurbita and powdery mildew, mainly damaging the leaves, petioles, and tender stems of pumpkin. The diseased part initially forms small white powdery spots, which later expand into large spots and flake, causing the leaves to dry up but not fall off. In the later stage, the white powdery spots become grayish white, with many small black spots scattered on them.
　　Prevention and control methods
　　At the initial stage of the disease, spray 1500 times of 15% triadimefon wettable powder or 500-600 times of polysulfide suspension agent. Technical points: early prevention, afternoon prevention, thorough spraying, and large water volume. Smoke method, sulfur powder fumigation or 45% chlorothalonil fumigation agent can be used in the greenhouse.

　　2.Downy mildew of pumpkin
　　It mainly damages leaves, stems, and pedicels, and leaves are damaged. At the beginning, water soaked spots were formed on the back of the leaf, and later, the lesion gradually expanded, becoming polygonal due to the limitations of the leaf veins. When wet, purple and black mold layers form on the diseased spots. The diseased spots on the front of the leaves are initially yellow, the edges are not obvious, and then turn yellowish brown. In severe cases, the diseased spots are continuous, and the leaves are curled and dried up. Only pay attention to the leaves.
　　Prevention and control methods
　　The central diseased plant was found, and the diseased leaves were removed and sprayed to focus on prevention and control. Common medicament: 250 times liquid of 40% Etapalumin wettable powder or 500 times liquid of 64% Antitoxic alum wettable powder, or 600~800 times liquid of DuPont Cresol wettable powder, or 600 times liquid of 75% chlorothalonil wettable powder, or 500 times liquid of 50% metalaxyl phosphate copper wettable powder. spray every 5~7 days in the morning of sunny days when the first disease occurs, and spray 3~4 times continuously, and 50~70kg liquid every 667 square meters. The above bactericides should be used in rotation to avoid drug resistance, and spray prevention should not be carried out in rainy days.

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