The characteristics of the disease: tomato spot blotch, also known as white star disease. In addition to harming tomatoes, it also harms the Solanaceae crops such as pepper and eggplant. The disease develops in the protection of the tomato and fruit vegetables. Once the disease is felt, the fruit is often damaged, resulting in serious deterioration of quality and large economic losses. The main symptoms and pathogenesis of spot blight are: the incidence of disease from the lower leaves. There are round or nearly round lesions on both the positive and negative sides, the edges are dark brown, the middle is grayish white, slightly concave, and the black spots on the fruit are scattered, with a diameter of 2 to 3 mm, which is fish-eye. In severe cases, the whole leaves are covered, causing the leaves to chlorotic and yellow. When the temperature is above 15 °C, it is most likely to develop in the case of rainy weather. Drying at high temperature is not conducive to the occurrence of this disease.
Control method:
1. Reasonable rotation should be carried out for 3 to 4 years with non-solanaceae crops to cultivate disease-free and strong seedlings. Seeds were collected from disease-free and healthy plants, soaked with 52 °C warm soup and fresh high-fat membrane solution for 30 minutes before sowing, and then germinated for sowing. The seedbed is planted with new soil or two years without planting the vegetable of the Solanaceae. After sowing, the new high-lipid membrane solution is sprayed on the surface to keep warm and protect the soil, and the seedling rate is improved.
2, cultivation management, increase the application of phosphorus and potassium fertilizer, improve disease resistance, pay attention to the field, timely pruning, drainage and dehumidification, remove the diseased body, remove the old leaves, promote ventilation and light. At the same time, timely spraying of Huahua No. 3 inhibited the main shoots and promoted flower bud differentiation; spraying the fruit and fruit before the flowering to improve the pollen quality, enhance the cycle fruit setting rate, and make the tomato stable and high quality.
3, chemical control, in the early stage of the disease should be sprayed according to plant protection requirements for targeted prevention and treatment, every interval of 7-10 days, 2-3 consecutive times, and with the application of new high-lipid membrane solution to enhance the efficacy, improve the utilization of active ingredients Consolidate the control effect.
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