I. Viral disease

1. Symptoms: Dwarfing of the plants after onset, leaf shrinkage, distortion, and dark greenish, light green and white spotted; internode shortening, the lower leaves gradually yellowing withered; fruit also shows yellow and green flowers Spot, dark green part of the protruding, sick melon malformations, the incidence of light heart leaves is mosaic.

2. Control methods: We must do a good job of prevention and control of pests in order to cut off the spread of the disease, to prevent and control worms as early as possible, reduce the chance of transmission. In the early stage of viral disease, 20% of virus A or 15% of virus may be sprayed for 2 to 3 times. If there is a tendency to spread, spray with anti-toxic agent No. 1 250 to 300 times for 3 to 4 times.

Second, powdery mildew

1. Symptoms: The leaves, petioles and stems can all be affected. The lesions begin with pale yellow dots and form white patches on the leaf surface. They gradually spread. Many white patches are connected to cover the entire leaf. , death, the plant premature aging.

2. Control methods: enhance ventilation and light transmission, increase plant growth potential, and increase disease resistance. At the beginning of the disease, 45% of chlorothalonil smoke can be used to kill pathogens. Each time, 200-250 grams of medicine is used per mu of greenhouse, and 15% triadimefon WP can also be sprayed on the leaves for 1500 times.

Third, gray mold

1. Symptoms: Mainly injurious flowers, young fruits, leaves, stems or larger fruits of zucchini. The peduncles of flowers and young fruits are initially immersed in water and gradually soften. The surface is dense with gray green mold, causing fruit shrinkage and rot. Black sclerotia sometimes grows.

2. Control methods: (1) Before and after the onset of growth, proper control of watering should be conducted, and timely release of air should be conducted at a timely manner. The diseased leaves, diseased flowers, diseased fruits and yellow leaves were removed in the seedling stage and the week prior to fruit enlargement, keeping the greenhouse clean and airy. (2) At the beginning of the disease, 10% quick-cylinder smoke was used to smoke pathogens, and 50% quick-wet WP could be sprayed alternately with 1500-2000 times liquid and 50% acetaminophen WP 1000 times. It can be sprayed with 65% antimycotic WP 1000-1500 times, 50% thiophanate-methyl (methyl thiophanate) wettable powder 500 times. The above-mentioned fungicides have better preventive effects than the therapeutic effects. After the onset of drug use, the dosage should be appropriately increased. In order to prevent the occurrence of drug resistance, alternating or mixed use of the fungicides is advocated.

Four, locusts

Aphids are the main pests of zucchini, causing serious damage. Controlling aphids can be smoked and killed with a flue-killing smoke agent. Each time, 400-500 g per mu of greenhouse is used to smoke and kill for 3 hours. Alternating foliar sprays can also be used to exterminate and kill 600 times liquid or 20% wipe-off EC 2000 times.

5. Whitefly

Alternately spray 10% Buprofimian EC 1000 times and 2.5% Trichomidic Monascus 1000 times.

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