This spring watermelon may be infected with a new quarantine disease virus, which will lead to watermelon harvest - Cucumber green mottle mosaic virus has been found, attention should be paid to prevention, but it is not necessary to remove the replanting.
Here, we will introduce this new virus disease. Cucumber green mottle mosaic virus host narrow range, mainly in cucumber, watermelon, melon and other cucurbit crops, seedlings and adult stage can be disease. The virus belongs to the mosaic virus and its symptoms are similar to those of common mosaic virus (mainly tobacco mosaic virus and cucumber mosaic virus). The main manifestations are the slow growth and development of plants, and the appearance of irregular fading or pale yellow leaves. The surface was highlighted, the foliage was uneven, and the leaf margin was rolled up. Afterwards, dark green and convex spots appeared, and the symptoms of aging were alleviated. The virus has a greater impact on the fruit. The cucumber shows melon yellowing or whitening, and produces dark green blisters-like necrotic spots. The surface of the watermelon is uneven, and the sound is blunt when slapd. The flesh has undergone severe discoloration or deterioration. Decayed, mature and loofah-like, commonly known as "blood flesh", bitter can not eat.
From the point of view of the transmission of the virus, it is mainly transmitted through seed and contact (sap contact or agricultural operations), but also through the soil, but the virus has not been found to spread through the transmission of pests. Therefore, in the watermelon shed in early spring, most of the viruses that occurred in large areas before April belong to this virus, and watermelon farmers should pay special attention to seedlings and after planting.
To prevent the virus, we must first disinfect the seeds. Soak the seeds with 10% trisodium phosphate solution for 10-20 minutes to avoid seed poisoning. When the symptoms of suspected viruses are found at the seedling stage, they must be removed immediately. The surrounding plants should be observed in isolation and sprayed with Ningnanmycin, virus A, and chitin for prevention. If the virus has already occurred in a large area, it should be replaced in due course, and no replanting of susceptible crops such as watermelons and cucumbers should be carried out. Instead, soy fruit and beans should be planted to prevent the spread of the virus.
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