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This issue of Shanghai science and education film studio Special focuses on the control of early blight on tomato. During the growth process of tomato, the early blight will cause a significant reduction in production and even stop production. Early blight on tomato is a plant disease caused by Alternaria solani. Plants infected with the disease will start to rot from the leaves until they die. By cultivating tomato varieties with strong disease resistance, researchers have developed high-efficiency mancozeb pesticides, and summarized the most efficient methods to control early blight on tomato.