The tomatoes were lying flat, the leaves curled and wilted, the whole plant withered and died, and many of the grown green tomatoes were “big faceâ€. The stems of infected plants have black-brown bar-shaped patches. The inside of the stems is clear of green tissue. The green part of the stem surface is sunken, revealing the withered culm inside, forming a strip of dark brown to gray-black Plaques; large patches surrounded by dark brown immersed necrotic plaques; green tomatoes also have irregularly shaped brown subsidence plaques, with darker black spots around the plaques and yellow-brown spots in the center.
Control methods: First, the selection of disease-resistant varieties of the lower part of the seed, the seeds before disinfection for sowing, can choose to use 10% trisodium phosphate solution soak for 20 minutes, clean water after sowing. The second is to strengthen the cultivation and management, timely transplanting. The base fertilizer is mainly cooked manure or high-quality organic fertilizer, biological bacteria fertilizer, reduce the use of nitrogen fertilizer, increase phosphorus and potassium fertilizers, improve plant disease resistance. The third is to use mancozeb, metalaxyl manganese zinc and other agents. The use of lime powder by neighboring Joe Uncle can reduce the “big face†symptoms of tomatoes, mainly because: First, lime can disinfect the soil. Second, lime can change soil pH. Acid soil is one of the major causes of the incidence of tomato early blight. Thirdly, lime can be used to supplement calcium in the soil, which has a good alleviation effect on the fruit deformity caused by the disease.
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