Why are Tomato stalks black? There are many reasons for the blackening of tomatoes. The "black stalks" can be divided into two types according to the location of the disease. One is browning and blackening at the base of the stem, and the other is the upper or lower part of the stalk. Dark brown spots appear in the sputum, and the "black stalk" at the base is caused by two diseases: stem rot and Phytophthora root rot. The "black stalk" at the stem or tiller is usually caused by tomato early blight and late Caused by diseases such as blight, stem blight and stripe virus disease. When the disease is mild, the plant grows slowly, the growth is weak, and the yield is reduced. In severe cases, the plant will wither and die. Therefore, today Xiaobian talks about tomato "black stalk" disease prevention and control measures. First, stem base rot prevention Stem-based rot: Stem-based rot is also called large seedling blight, and the brownish spider silky mildew can be seen in the later stage of the disease, and the plants gradually wither and die. Control: Irrigation with roots with 20% solution of methyl chlorophosphorus emulsifiable oil 1200 times and 95% of Greenheng No. 1 (causal). Second, Phytophthora root rot prevention Phytophthora root rot: dark brown spots appear on the base of the stem, the lesions are sunken, and the catheter becomes brown at the base of the longitudinal section. Control: Irrigation with 72.2% Plex 800 times mixed with 50% DT500 times mixed with 80% Jinnahai (Fumei double) 750 times solution. Third, early and late blight Early blight: Irregular brown spots on stems or tillers, and black mold on high humidity. Late blight: The stalk or tiller is thin and dark brown, with obvious cloud spots on the diseased fruit. Control: Directly spray 68% of Jinruidomeer (fine metal creamer + mancozeb) 800 times solution for prevention. Fourth, stem blight Stem blight: oval-shaped brown lesions on the stem, extending up and down, and later lesions can invade into the vascular bundle. Control: Spray 50% of the chlorhexidine WP 1000 times solution. V. Stripe virus disease Stripe virus disease: Dark brown plaques are produced on the stalks. The discolored parts of the lesions only occur in the epidermis and do not penetrate deep into the vascular bundle. Control: Spray 2% Ningnanmycin 500 times liquid in the early stage of the disease, or 20% virus A wettable powder 500 times solution. For the wonderful pictures and popular comments on the prevention and treatment of tomato "black stalk" disease, you may be interested in the following recommended contents, welcome to read. Air-dried pumpkin is a type of food made by dehydrating pumpkin using hot air. This process involves removing the moisture from the pumpkin, which helps to preserve the nutrients and flavor of the pumpkin. Dried Pumpkin,Dehydrated Pumpkin For Stuffing,Dehydrated Dried Pumpkin,Dehydrated Pumpkin Slices Jiangsu Tiankang Food Co., Ltd. , https://www.tiankangfood.com
