Planting tomatoes in winter greenhouses is more likely to occur. There are two kinds of diseases that are more serious. One is late blight and the other is gray mold. Let us talk about the symptoms and prevention methods of these two diseases today.
Late blight is a devastating disease for tomatoes. Stems, leaves and fruits can be harmed. The seedlings usually have dark green water-stained lesions from the leaves, and the rear stems expand. The petiole is dark brown and rot. As the disease progresses, the base of the young stem is water-stained and collapsed, the plant is wilted and folded, and the white mold layer is formed in the diseased part when wet. In the adult stage, the dark green water-stained lesions are gradually formed from the tip and leaf margin of the lower leaves, and gradually become brown. When wet, the leaf back surface disease and the healthy joints produce white mildew; the lesions on the stem are brown or Dark brown water stains, slightly sunken, white mold when wet; fruit spots are initially oily dark green, gradually become dark brown to brown (yellow) color, lesions cloud-like, hardened, white when wet mold. The suitable temperature for onset is 18 ° C - 22 ° C, and the relative humidity is 95% or more.
Botrytis cinerea mainly causes serious damage to leaves and stems and infects flowers to cause fruit damage. In the pathogenesis of the leaves, a "V" shaped brown lesion is formed inward from the tip of the leaf, the edge is water-immersed, and there are deep and shallow wheel patterns, and the surface of the lesion is covered with a gray mold layer. The onset of the fruit is soft rot, the skin is grayish-white water-immersed, and the diseased part has no obvious edge. Farming operations such as pruning, picking and picking fruits can cause wounds. In high-humidity environments, Botrytis can also infect the stems of tomatoes, forming brown lesions and sometimes forming soft rot. Suitable conditions for the onset are temperature 20 ° C -25 ° C, relative humidity of 90% or more.
In summary, it is about the winter blight tomato late blight and gray mold disease, this disease must not be ignored, I hope to help everyone.
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