Every farmer should be very aware of the hazards posed by pests and diseases to the crops. Therefore, it must not be taken care of in the prevention and control of pests and diseases. It is necessary to treat them with care, and observe the growth of crops in the field in time. Once the disease occurs, it is necessary to find the symptoms in time, and the right medicine, let’s take a look at the garlic. The symptoms and prevention methods of purple spot disease.
First, the symptoms of garlic purple spot disease
It is mainly harmful to leaves and garlic, which is a disease in the late growth stage. It can sometimes infect bulbs during storage. At the beginning of the disease, many small gray spots are produced from the tip of the leaf or the middle of the garlic. The central micro-purple is slightly sunken and gradually enlarges into an elliptical or spindle shape, which is yellowish brown or dark purple. When the humidity is high, the diseased part produces black mildew, which is a concentric wheel. Grain. The suitable temperature for onset is 25 °C - 27 °C, less than 12 °C does not occur, warm, high humidity incidence.
Second, garlic purple spot control method
1. Agricultural control: Choose a large, healthy, even or detoxified high-quality garlic. The “May 1st†rotation is carried out on the heavily affected plots, that is, the 5-year-old garlic is used for 1 year of wheat. Strengthen field management, timely seeding, rational close planting, apply sufficient base fertilizer, apply more soil and fertilizer, rationally match nitrogen, phosphorus and potassium fertilizers, improve plant disease resistance, timely drainage after rain, timely remove diseased bodies, reduce Field source.
2, chemical control: 64% anti-virus WP WP 500 times solution or 75% chlorothalonil WP 500 times solution or 70% mancozeb WP 500 times solution for 2-3 times.
It is very important to find the symptoms of garlic purple spot disease in time. This is the reason why farmers should go to the field for observation. Early detection and early treatment can reduce the loss.
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