First, the stem base "black stalks" Under normal circumstances, the base of the tomato stem "black stalk" is caused by stem rot, phytophthora root rot disease caused by these two diseases. Stem rot disease, the key point of the disease is to identify the pathological lesions around the culm one week at the base of the stalk, contracture, and later visible spider silky mildew, the plant gradually withered and died. Prevention and treatment of the disease can be used 20% of rifamphub EC 1200 times mixed with 95% of the Green Hunter No. 1 (badaming) 3000 times to irrigate. Phytophthora root rot disease, stems produce dark brown spots, gradually expanded after the stem around the week, lesions depression, and stem rot disease is different, the vertical cut stem visible catheter browning, and stem rot is not. Prevention of the disease can be used 72.2% Prec 800 times mixed with 50% of the DT500 times mixed with 80% of Jin Nai Hai (Fumei double) 750 times for rooting.
2. "Black stalks" stems or "black stalks" at the culms or tillers at the "black stalks" are usually caused by diseases such as tomato early blight, late blight, stem blight, and streak virus disease. Early blight, irregular brown spots on stems or tillers, and black mold on high humidity. In late blight, stems or tillers become thin and dark brown, with obvious cloud spots on the affected fruits. The main drug for preventing and controlling early blight is mancozeb, and the main drug for the prevention of late blight is metalaxyl, so the prevention of these two diseases can be directly applied to 68% of Jinreda Mier (Mesozin+Dyson) Manganese zinc) 800 times liquid for prevention. Stem blight, ellipsoid brown lesions on stems, up and down, late lesions can invade into vascular bundles, causing the disease pathogens and early blight are the same, are Alternaria solanacea, the control of the same generation Mm-Zn-based drug, in addition to spraying Jin Lei Duo Mier, you can also spray 50% of Propionine WP 1000 times. In the case of streak virus disease, dark brown patches are produced on the stems. Unlike the stem blight, the diseased parts are mostly near the growing point of the plants, and the discolored parts of the lesions only occur on the epidermis and do not penetrate into the vascular bundles. This is the difference. The key to both. When controlling the disease, it is necessary to spray 2% of Ningnanmycin 500 times liquid or 20% of virus A wettable powder 500 times in the early stage of disease.
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