Disease prevention and treatment
Black spot: mostly occurs in the seedling stage. After the plants are damaged, the leaves and petioles produce small dark spots. When the temperature is high, the lesions expand to gray-brown round lesions with a diameter of 5 to 10 mm. The rouleaux is not obvious and is thin. And easy to break, causing blade perforation. Its prevention and control methods: First, implement reasonable rotation, suitable planting density, good ventilation and light transmission; second, use 75% chlorothalonil wettable powder 500 to 600 times liquid at the beginning of disease, or 50% quick-inking WP 2000 times Liquid, spray once every 7 to 10 days, and spray 2 or 3 times.
Powdery mildew: mainly damages the leaves, petioles and stems. In the early stage of disease, white powder spots appear on both sides of the leaves and gradually enlarge into white circular spots with white powder. The prevention and control methods are: spraying biological pesticides 2% NF 120 or 1% Wuyi in the early stage of disease. Su Shui agent 150 times, spray every 5 days, even spray 3 to 4 times. 27% high-fat film emulsion can be used 30 to 100 times the liquid, sprayed on the leaf surface at the beginning of the disease to form a protective film, play a preventive role. Can also be used 15% triadimefon 1500 times liquid, or 70% thiophanate-methyl 1000 times spray, spray once every 7 days, and even spray 3 to 4 times.
Pest control
Red spiders: many species, threatening calf scorpion is cotton red spider. In the event of a hazard, they clustered on the back of the leaves, and the nets sucked sap. The damaged leaves were yellowish-white dots at the beginning, and later they turned into rust-brown spots. In severe cases, the leaves curled up, like burning, dry off, affecting fertility, and reducing yield. Its control method can be sprayed with 40% dimethoate EC 2000 times, or can be sprayed with 1.8% ACCU EC 4000 to 5000 times.
Insects: Piercing the stems and leaves of the plants with a sucker to suck juice, causing the leaves to shrink, curl, produce insects and other harmful symptoms. The prevention and control methods are sprayed with biopesticide nicotine 2% emulsion 800 to 1000 times in the initial stage, spray once every 7 days, and spray 2 or 3 times; use 10% imidacloprid (one pass) WP 2000-4000 times Liquid spray; can also be used 50% carbendazim net emulsion 2000 times liquid spray, spray once every 7 days, and even spray 2 or 3 times.
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