Control of early Blight of Cherry Tomato

Early blight is the main disease of cherry tomato, which distributes widely and occurs widely. It mainly occurs in autumn in open field and sometimes in protected field. Generally, 30%~50% of diseased plants occur, and 100% occur in severe cases. Some branches and leaves are necrotic due to disease, which obviously affects cherry tomato production. The disease mainly infects leaves, but also leaves, branches and stems. Leaves infected, initially formed brown necrotic spots, later developed into nearly round brown with concentric ring pattern necrotic spots, yellow-green edges, multiple disease spots connected to each other caused leaves to turn yellow and die. Petiole, branches and stems infected, mostly oval to irregular brown necrotic spots, obviously depressed, often with concentric ring patterns, rough surface, easy to break from the disease. The air is humid, the surface of the disease spots produce gray black mold, namely conidia and conidia. Control methods: 1. Apply enough organic base fertilizer, combined with increased phosphorus and potassium fertilizer. In the growth period, topdressing and watering should be applied timely to avoid premature aging of plants and enhance the disease resistance of hosts. 2. Do a good job of cleaning the countryside, thoroughly remove the diseased tissues and fallen leaves after harvest, remove the diseased leaves in time during the growth period, and reduce the source of bacteria. 3. At the early stage of disease, pesticide control can be carried out by selecting 50% diaphanil wettable powder 1000 times solution, or 50% chlorphenicol wettable powder 500 times solution, or 2% agricultural antibiotic 120 water solution 200 times solution, or 50% captan wettable powder 400 times solution, or 80% Dasheng wettable powder 800 times solution, or 70% mancozeb wettable powder 600 times solution, combining with bacterial disease control, 47% Garinone WP 600-800 times solution can also be used for spraying, once every 10 - 15 days, and 1 - 3 times according to the disease condition.