Recently, more than 100 greenhouses in Sanshan Village, Gaoguanzhai Town, Zhangqiu City, Shandong Province have a strange disease. From the bottom to the top of the leaf, round or near-circular lesions appeared on the front and back of the leaf, and many small black spots were scattered on the leaves, showing a fish-eye shape. Some leaves have turned green and yellow.
On the morning of September 29, we were invited to the greenhouse of Sun Jicheng of Sanshan Village. After field inspection, it was diagnosed as tomato spot blotch. Tomato spot blotch is similar to tomato spot disease, bacterial spot disease, and scab disease, so it is difficult for non-professional plant protection personnel to distinguish. If improper misdiagnosis is used, it will cause great losses for farmers.
Tomato spot blight, also known as white spot disease. In addition to harming tomatoes, it also harms solanaceous crops such as peppers and eggplants. The disease has shown a tendency to develop on solanaceous vegetables in the protected areas. Once it is susceptible to disease, it often suffers from fruit damage, resulting in serious deterioration of quality and greater economic losses.
The main symptom and pathogenesis of spot blight is: it starts from the lower leaves. Ye Zheng, opposite sides appear round or near-circular lesions, the edge of dark brown, gray in the middle, a little sunken, scattered small black spots on the fruit, diameter 2 to 3 mm, was fish-eye-like. When full, it is full of leaves, causing the leaves to turn green and yellow. When the temperature is above 15°C, it is most likely to be affected by rainy weather. High temperature dryness is not good for this disease.
The main characteristics of the diagnosis of tomato spot blotch should be to catch the disease, the main features of which are small lesions, fish-eye-like, and many small black spots scattered on it. This is different from tomato spot disease. The main characteristic of spot disease is that the necrotic spot is grayish yellow or brownish brown, with a brown vein on the edge or a yellow halo around the edge, and a dark gray moldy layer when wet. It is also different from bacterial bacterial spot disease. The characteristics of bacterial bacterial spot disease are: dampness, cold, low temperature, and rain, and it is beneficial to disease after sprinkler irrigation. The lesion is dark brown to dark brown, halo, and marginal and immature fruit are affected. obvious.
Tomato spot blight caused by the infection of tomato shell spore bacteria. The pathogenic fungi belong to the semi-known fungi Subphyla fungi. With mycelium and conidia in the sick, perennial weed Solanaceae, winter warm shed indoor winter. Attached to the nightshade vegetable crops or seeds overwintering became the source of infestation early in the year. The germ development is suitable for temperatures of 22°C to 26°C, and is poorly developed below 12°C or above 27°C. High humidity is conducive to the overflow of conidia from the device, suitable relative humidity of 92% to 94%, when the humidity can not reach the disease.
Prevention measures: 1 and non-solanum crops for 3 to 4 years of rotation for change. The use of fully cooked organic fertilizer, even as a greenhouse per acre, "gold micro" microbial agents 30 kilograms, adding beneficial microorganisms to the soil, so as to achieve the purpose of improving the soil. 2 Chemical control: Use 600-fold solution of urea-urea cyanogen or extinguish 400-fold solution or 64% anti-virus 500 times solution to spray, and add 600-800 times solution of all-soluble Indian calcium when spraying, and the control effect is better.
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