Recently, vegetable growers from several tomato planting bases in Wanghengcun, Qianyanzhuang, and surrounding counties in Weixian County reported that the occurrence of gray molds in greenhouses was heavy and gradually increased. Compared with the same period in previous years, this year’s occurrence occurred early, spread quickly, and was difficult to remove. It has been rare in recent years.
Botrytis cinerea is a major disease in tomato production. It can be infected at the seedling stage and adult plant stage, and it is mainly harmful to leaves, stems, inflorescences and fruits. Infected at the seedling stage, it turns yellow from the apex of the cotyledon and then spreads to the young stem, resulting in brown or light brown lesions. In the adult stage, the lesions were found in the leaves and developed in a "V" shape from the edge, and produced irregular shades of shades with a small amount of gray mold on the surface. The leaves finally died. Onset of fruit, from the residual flowers and receptacles began to infest, to the fruit or fruit stalk, the skin from the gray water stains become soft rot, after the appearance of a large number of ash-brown mold layer on the fruit surface, calyx and stalk, fruit loss Fossilized.
In the past, Botrytis cinerea was generally heavier in winter where there was more rain and snow, higher humidity, and less light. However, this condition was not met this winter and the disease was severe but it was rare. In view of this special situation, we must pay great attention to prevention and control. In addition to the alternative use of procymidone and other aerosol fumigation and supplementation of high potassium and a variety of medium and trace element fertilizers to enhance the disease resistance of plants, in the prevention and treatment of pharmaceuticals, the following methods can be sprayed, and can achieve better results.
1. Spray with 25% zizoconazole EC 750 times.
2. Spray with 50% iprodione suspension 1000 times + 70% pyrimethanil 1500 times.
3. Spray with 50% procymidone WP 900 times + 200 million live spores/gram of Trichoderma WP 600 times.
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