I. Symptoms There are three main types of tomato virus disease. The first is the mosaic type. The top leaves of the tomato appear yellow-green leaves. The new leaves are small and do not stretch. The second is the leaf or leaf type. The new leaves at the top of the plant are linear, or crimped, and the diseased plants are short. The third is streak-type, forming dark green to dark brown stripes on the stem, depression, malformed fruit, green spots on the fruit spots or rust necrotic spots, not red, cut the fruit along the skin and brown between the flesh stripe.
Second, control methods
1. Select disease-resistant varieties for agricultural measures, pay attention to clean gardens, timely clear away diseased plants and diseased fruits, increase phosphorus, potassium, and zinc fertilizers, apply foliar fertilizers on foliage to enhance disease resistance; timely watering, In the fruit period, we can see that the wet is not dry, prevent the drought due to lack of water, aggravate the disease; appropriate sowing, keep the daytime temperature 25-30 °C, 15 °C at night, increase the temperature difference between day and night, can reduce the incidence.
2. Seed Disinfection Treatment Seeds are first soaked in clean water for 3-4 hours, then soaked in 10% trisodium phosphate solution for 30-40 minutes, then rinsed with water, then germinated and sown.
3, the whole shed disinfection and treatment of lice before the disease prevention and control, timely cleaning the garden, spaced from the sowing tomato period of more than half months, so that all the corpses of rot. At this time, it can be used to kill 300 times the liquid and add the drug to cure the lice. The whole shed is sprayed to kill the remaining bacteria and worms in the shed.
4. Pharmaceutical control At present, there are no specific drugs for the prevention and treatment of viral diseases, and prevention should be the main method. According to the existing drug application, the occurrence of viral diseases should be suppressed as much as possible. Prevention of cilantro virus disease, can be used 5% bacteriocin clear 300 times solution, 1.5% plant disease spirit 500 times solution, zinc sulfate 800 times solution, green Fenwei 1 1000 times solution, etc.; control mosaic and streak virus disease, Can be used 5% bacteria clear 300 times liquid, 20% virus A500 times, 500 times trisodium phosphate and so on. In addition, combined with foliar spray fertilizer containing phosphorus, potassium, zinc, to enhance disease resistance, both prevent disease and high yield.
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