First, the correct identification of purple spot: the main damage leaves, garlic sprouts, for the late growth of disease, storage can sometimes infect the bulb. In the early stage of disease, gray spots were mostly generated from the tip of the leaf or the middle of the garlic sprouts. The central micro-purple was slightly depressed and gradually enlarged into an elliptical or spindle-shaped, yellow-brown or dark purple. When the humidity was high, the diseased part produced black mold and showed concentric circles. Pattern. The suitable temperature for disease onset is between 25°C and 27°C. It is not affected when it falls below 12°C. The onset of warmth and high humidity is heavy. Second, control methods: 1. Agricultural control A large, healthy, uniform or detoxified high-quality garlic seed is selected. The "May 1st" type of rotation is carried out on land with severe disease incidence, ie, 5 years of garlic rotation for 1 year of wheat. Strengthen field management, timely enough sowing, reasonable close planting, adequate basal fertilizer, and more miscellaneous fertilizers, so that nitrogen, phosphorus, and potassium can be reasonably matched to improve plant disease resistance, timely drainage after rain, remove diseased bodies in time, and reduce Field source. 2, available 64% anti-virus WP WP 500 times or 75% WP 500 times chlorothalonil or 70% mancozeb WP 500 times even 2-3 times.
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