Vegetable rust prevention and control measures for onions and garlic

Rust is often caused by onion, garlic, leeks, onions and other onions and garlic vegetables. The condition is fierce, rapid development, so that the leaves lose food value, resulting in greater economic losses.

Onion and garlic vegetable rust mainly damage leaves, pedicels and other parts. At the early stage of the disease, the epidermis produces an oval or spindle-shaped orange-yellow freckle. The posterior epidermis ruptures and erupts, emitting orange-yellow powder (the uredia spores and uredospore). After autumn or when the environmental conditions are poor, the freckle becomes dark brown, and when it breaks, dark brown powder (the teliospore and teliospores) is dispersed. In severe cases, the freckle is covered with leaves and the diseased leaves are dry.

The disease is caused by the infection of the basidiomycotina fungus Onionella oleracea. It is a gas-borne disease and spreads rapidly. Prevalence is related to climatic conditions, cultivation management, and host resistance. Bacteria hi hi temperature and humidity conditions, low temperatures in early spring and rainy, the case of continuous rain in summer, autumn heavy fog and heavy rainfall. Fertilization is not balanced, partial nitrogen fertilizer, potassium fertilizer is insufficient, easy to get disease; planting density, poor ventilation, easy to disease; low-lying, heavy soil, land, causing poor drainage, onion and garlic vegetables disease resistance is more severe. There was a difference in disease resistance among different onion and garlic varieties. The survey results showed that the five onion varieties Changbai 501 and Wuye Changbai 502 had better disease resistance than Zhangqiu No. 1 and Zhangqiu No. 2, and the disease resistance of Zhangqiu was greater. Poor; purple skin garlic is more resistant to rust, white garlic is more serious.

To prevent and cure onion and garlic vegetable rust, it is necessary to strengthen the cultivation and management on the basis of planting disease-resistant varieties, and to increase the disease resistance of the plants. Comprehensive prevention and control measures focusing on the eradication of bacteria source and chemical protection should be adopted. In case of rainy years, it is necessary to check in time and spray prevention. At present, triazole bactericides are the main drugs for preventing and treating rust, and triazolone, propiconazole, difenoconazole, diniconazole, tebuconazole and other sprays can be used at the beginning of the disease, once every 7 to 10 days. Continuous control 2 to 3 times.

Frozen Red Shrimp

Shrimp Frozen,Export Shrimp,Red Shrimp,Frozen Red Shrimp

Zhoushan City Shuangying Aquatic Products Co., Ltd.   , https://www.shuangying-aquatic.com