First, the symptoms of the disease vary greatly. In the seedling stage, the young leaves turn into copper, and many small black spots are formed. The back of the leaves are purple along the veins, some grow dead, and brown necrotic streaks are formed at the stem ends. The diseased plants grow only halfway or completely short. The defoliation or defoliation is wilting, and the early onset of the disease is not the result. After the fruit is infected, there is a chlorotic ring spot on the fruit, the green fruit is slightly raised, the wheel pattern is not obvious, and brown necrotic spots are formed on the green fruit, which is a tumor-like protrusion and the fruit is easy to fall off. The mature fruit is obviously round, with reddish yellow or red and white. The chlorotic plaque is obvious in the full color stage, and the severe whole fruit is stiff. The umbilical symptoms are similar to those of the umbilical rot, but the skin of the disease is brown and necrotic. Rot.
Second, the host host has a wide range of 271 species of 34 families of dicotyledonous and monocotyledonous plants. Important hosts include tomatoes, peppers, peanuts, tobacco and other crops.
Third, the transmission route The disease is mainly caused by the transmission of Hummer. In addition, the juice can be inoculated, the seeds can also be transmitted, the field management is poor, the farming operation, and the disease and health plants rub each other easily to cause the disease. This virus can be wintered through some wild plant species. However, the level of virus prevalence is mainly dependent on the density of the larvae. The most important adult insect, the adult of the thrips, is hidden in the soil. After the soil temperature rises in spring, the pests will migrate to the weeds.
Fourth, prevention and treatment methods (A) agricultural control 1. Selection of disease-resistant varieties. 2. In the affected area, it is necessary to eradicate bitter vegetables, wild dahlias and weeds in the field. 3. Rotating with non-solanth crops for more than 3 years. 4. The tools involved in the farming operations should be disinfected. (B) physical control can be used to prevent and control Hummer. (3) Chemical control The disease mainly adopts the prevention and control strategy of “cutting off the poison source and controlling the insects and preventing diseasesâ€. The available agents are: avermectin + imidacloprid; aphid + avermectin.
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