I. Symptoms of viral diseases
The common symptoms of tomato virus disease are mosaic, streak and fern leaves. Mosaic type: a kind of slight mosaic on the tomato leaves, the plant is not short, not deformed, the other is a clear mosaic on the leaves, the new leaves become smaller, the leaves are small and narrow, distorted deformity, small fruit quality Bad, mostly flower-faced. Stripe type: the upper leaves show dark green and white mosaic lesions, the middle of the stem shows a dark green subsidence of the first short stripe, after the dark brown subsidence of oily necrotic stripe, fruit deformity, flesh epidermis sinking, long Oil immersed ring dead spots. Fern leaf type: The diseased plant is obviously dwarfed, and the lower leaf edge curls up. The tube is severely tubular. The upper leaf is small and forms fern leaf.
Second, the characteristics of the disease
Field operations such as colonization, pruning, snoring, tying vines, etc., pass pathogenic strains of pathogenic strains to Jian Zhu; the migration and harm of locusts are also important means of transmission. When the virus is generally cold, the virus disease does not show symptoms or symptoms. As the temperature rises, the symptoms of mosaic and fern leaves usually appear at about 20°C.
Third, prevention and control measures
1. Select resistant varieties. According to the local main source of poisons, disease-resistant varieties should be selected according to local conditions.
2, the implementation of virus-free seed cultivation. Seed soaking with fresh water for 3 to 4 hours before sowing, and then immersed in 10% trisodium phosphate solution for 40 to 50 minutes, remove and rinse with clean water before germination sowing. Planting sites must use fields that have not been planted with tomato or tomato virus disease. Deep plowing must be performed.
3, the implementation of rotation for change. Avoid continuous cropping for many years to reduce virus transmission from tomato virus disease soil and residues and reduce the occurrence of viral diseases. Weeds and planted sheds should be thoroughly cleared of toxic weeds and diseased plants to reduce the virus source of virus diseases; .
4, cultivation and disease prevention measures. One is to sow appropriately, cultivate strong seedlings, and require flower buds when planting, but it does not age; the other is early planting at the right time to promote strong seedlings; and third, cultivating weeds, cultivating soil in time, promoting hair roots, and fighting lately. Harvest early.
5, early locust control, whitefly. Nursery and planting sites should be treated with 10% WP as soon as possible to control weeds, as well as surrounding aphids and whiteflies, and to prevent the spread of insect vectors such as aphids and whiteflies, which can effectively prevent virus infection and reduce tomatoes. The occurrence of viral disease.
6, pharmaceutical control. With 1.5% phytosanitary 800 times the virus or 20% of the virus A600 times in the seedling period to spray 2 times, spray every 10 days after flowering, and even spray 3 to 4 times.
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