First, the onset of symptoms: both the seedling stage and the adult stage can be the disease, the main symptoms are mosaic type, yellow shrinkage type two, sometimes the same type of two types of plants appear at the same time.
1. There are bright veins and chlorotic spots on mosaic-leaved young leaves, followed by mosaic leaves with dark green freckle. In severe cases, the parietal lobes are chicken-like. Early onset can cause wilting in whole plant, no melon or fruit deformity.
2. The upper leaves of the yellowing and shriveling plants are chlorotic along the veins, with thick green wrinkles, followed by yellowing of the leaves, shrinking and rolling down, or emergence of leaflets of fern leaves, shortening and dwarfing the internodes of the plants. The corolla was distorted and dark in the late stage of the diseased plant. The stigma of the pistil became shorter and distorted. The sapling of the pistil did not have melon or small fruit. Dark green spots, streaks, or bumps were observed on the fruit surface. Some of the diseased melons in the middle and late stages were shedding. When the plant died.
Second, prevention and control measures
1. Variety selection The disease-resistant and disease-resistant varieties suitable for local planting are selected.
2. Disinfect the seeds with 10% trisodium phosphate solution soak in seeds for 20-30 minutes or 1% potassium permanganate solution for 30 minutes, rinse with clean water and germinate. Seed moisture content below 10% can be 70 °C dry heat treatment for 72 hours.
3. Cultivate disease-free and strong seedlings without diseased soil and raise seedlings to avoid the peak period of migration of aphids, strengthen management at seedling stage, and spray 5 ml/L of a-naphthalene acetic acid water solution or multi-micro-efficient compound fertilizer every 10 days. Such as erythritol, etc., sprayed 2-3 times.
4. Control of locust seedbeds and sheds Vents Covering insect nets to prevent locusts from moving in, yellow plates can also be used. In the growing period of the seedling stage, aphids can be selected by using 10% imidacloprid wettable powder 2000 times, or 25% thiamethoxam water dispersible granules 5000 times, or 2.5% high-efficiency chlorofluorocypermethrin emulsifiable concentrate 3000 times. Spray off the locust in time.
5. Spray 10% of mixed fatty acid aqueous solution 100 times before and after colonization, spray 0.5% of mushroom proteoglycan hydrolyzate 300 times, or 20% hydrochloric acid morpholinium copper wettable powder 500 times, etc. , spray once every 10 days or so, continuous spray control 2-3 times, there is a certain control effect.
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