How to use drugs for pumpkin mosaic virus disease

Symptoms: the main symptoms are uneven distribution of chlorophyll, macula or deep and shallow mottled flowers and leaves, sometimes along the vein chlorophyll concentration increases, forming a dark green alternating zone, seriously causing the leaf surface to show uneven, wrinkled and deformed veins. In general, the symptoms of new leaves are more obvious than those of old leaves. In severe cases, the stem and parietal lobe are twisted. The fruit is infected with chlorotic spots or tumor-like protrusions or deformities on the fruit surface. After blooming and bearing fruit, the disease tends to get worse. Pathogen: melon mosaic virus causes mosaic disease, its characteristics can be seen in muskmelon virus. Pumpkin mosaic virus has a narrow host range and only infects melons and legumes. The virion is spherical, the dilution limit of 25-30nm virus juice is 10000-1000000 times, the passivation temperature is 70-80 ℃, and the in vitro survival time is more than 28 days. In addition, cucumber mosaic virus can also cause mild mosaic symptoms, see cucumber virus. Transmission route and disease condition: muskmelon mosaic virus is carried by seeds and transmitted by cotton aphid and peach aphid. Pumpkin mosaic virus is transmitted mainly through juice friction, or cucumber striped leaf beetle, 11 star leaf beetle and so on. The seed in the field has the advantages of high virus-carrying rate, extensive management, many insect pests and serious disease. Pollution-free prevention and control method: (1) select anti-virus varieties such as golden chestnut. Select seeds from disease-free plants to prevent seed transmission. (2) strengthen field management and control aphids and leaf beetles in time. (3) soak the commercial seeds with 10% trisodium phosphate for 20 minutes, then sow the seeds after washing. (4) at the initial stage of the disease, 24% copper mixed fatty acid (duxiao) water agent 800 times solution or 20% morpholine guanidine ethyl copper hydrochloride (du Kexing) wettable powder 500 times solution, 7.5% Keduling water agent 700 times solution, 10% mixed fatty acid copper water agent 100 times, 5% bacteriostatic film) water agent 400 times, every 10 days or so once, continuous prevention and treatment 2-3 times.