The onion purple spot disease is a fungal disease caused by the infection of A. sphaeroides. The germ can also infect garlic, leeks and the like. Promptly carry out pesticide control and recover losses.
Incidence pattern: The pathogen is overwintered by the mycelium attached to the host or the diseased body. In the coming year, conidia are generated by airflow and rainwater. Warm and rainy summer is more serious.
Diagnosis: The disease mainly harms the onion leaves and pedicels, and can also harm the bulbs. Most of the lesions start from the tip of the leaf or the middle of the peduncle and then spread to the lower part. The initial lesion is a slightly concave white spot, which is enlarged to present an elliptical or spindle-shaped lesion. The size and color of the lesion vary depending on the type of host. The onion and the onion are purple-brown and large; the garlic spots are yellowish brown and small. When the humidity is high, the disease minister has brown to dark brown powdery mildew (conidiophores and conidia), often arranged in a concentric pattern, and the diseased part is easy to fold.
Control method: use disease-free seeds, and dip them with 300% formalin 300 times for 3 hours, then wash with water. After washing, remove the diseased body and deepen the soil; choose the drainage and fertile planting; apply the base fertilizer to increase the application of phosphate fertilizer; store the sputum to keep the temperature low and low humidity (0 ° C and relative humidity 65%), and pay attention to ventilation to prevent storage period The bulb continues to develop.
Chemical control: China's pesticide network recommends that 75% chlorothalonil WP can be sprayed at the beginning of the disease, 58% of metalaxyl Mn-Zn wettable powder 500 times, 7~10 days, and spray 3 times.
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