In addition to zucchini, zucchini virus disease also kills pumpkin, melon, watermelon, melon and other melon vegetables.
Symptoms: Symptoms of zucchini virus disease: The disease is systemic infection, which can occur from seedling to adult growth period, but it is harmful and lossy at the seedling stage. There are mainly mosaic type, yellowing and shrinking type and a mixture of the two. Mosaic type: young leaves begin to appear in the veins, yellowing spots appear in the leaves, and the leaves are mottled with uneven color. The severe parietal deformity is like chicken claws, causing wilting in early onset. Yellowing and shrinking type: The upper leaves of the plant appear thick green clumps along the tip of the veins, yellowing of the leaves, shrinking and shrinking, new leaves become smaller or fern leaves or lobes appear, the plants are obviously dwarfed, and the diseased plants are distorted Malformation, small fruit, uneven surface, tumor-like, severely dead in the whole plant. Mixed type. It is characterized by both flower and fern leaves. The diseased plant is poorly developed, the flower is not well developed, it is difficult to sit on the melon, the sitting melon is also small, the melon surface has a tumor-like protrusion, and the edible value is lost.
Characteristics of the disease: high temperature and drought are the main conditions for the onset. The former stalks are cucumbers, melons and other crops, or they are susceptible to disease by arboring and intercropping with melon crops. The squash is deficient in fertilizer, and the management is extensive, and the plants with weak growth tend to be seriously ill. The zucchini virus disease in the shed can occur all year round. The incidence is mild in winter and spring, and the disease is heavier in summer and autumn. The virus disease often shows symptoms when the plant enters the flowering stage. At this time, the disease often causes irreparable damage.
Control methods: 1, agricultural control: 1 adjust the sowing date, try to make the zucchini disease stage avoid high temperature and high humidity season, avoid the aphid, gray planthopper adult activity period. 2 ridge cultivation, 30 cm wide silver-gray mulch film, reflective film, repellent effect on the transmission of aphids and gray planthoppers. 3 When working in the field, the tools should be disinfected, and the diseased plants should be removed in time to avoid spreading the infection. 4 reduce contact with viral virus can be transmitted through plant wounds, so in the cultivation should increase the line spacing, carry out hanging cultivation, as much as possible to reduce the wound caused by farming operations. The operation of farming should follow the principle of the first strain of the plant. Do not need to fight on early-maturing zucchini to avoid causing wounds to spread poison. 5 Strengthen the management of fertilizer and water, avoid premature aging, and premature aging of zucchini seedlings is easy to be infected with viral diseases. In the cultivation, it is necessary to strengthen the management of fertilizer and water to avoid water shortage and de-fertilization. In the hot season, water can be appropriately watered to lower the ground temperature. It can also be used to prevent the premature aging of the seedlings and reduce the disease resistance.
2. Chemical control: seeds are soaked in 10% trisodium phosphate solution for 20 minutes, or soaked in warm water at 55 °C for 30 minutes. Control the locusts in time, and remove the weeds around the melon fields before the locusts move. Spraying at the seedling stage will continue until the aphids continue to be controlled. The drug can be selected with 10% imidacloprid wettable powder, and the field can be covered with silver ash film to avoid cockroaches. In the early stage of the disease, spray 20% virus A wettable powder 500 times liquid, or 1.5% phytopathic emulsifiable milk 1000 times liquid, once every 10 days, continuous control 2-3 times.
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