The prevention and control of leek rust caused by rust

Rust mainly infects the leaves and pedicels of leek, which is a fungal disease and spreads by airflow. At the initial stage of the disease, there are hammer-shaped or oval-shaped orange blister spots on the epidermis, there are yellow halo rings around the disease spots, and then expand into bullous spots. After the epidermis is ruptured, there are orange powder on both sides of the leaves, and both sides of the leaves can be infected. In the later stage, there are black blister spots on the leaves and flower stems of leek. When the disease is serious, the disease spots cover the whole leek leaf, the whole border of leek, the leaf turns yellow, sends out rust powder and loses edible value.

Leek rust

Prevention and control measures:

1. Selecting excellent leek varieties adapted to different periods, such as Beijing Dabaigen, Beijing Daqing Miao, Hanzhong Winter Allium, Shouguang single Root Red, Shandong 9-1, etc., can reduce the incidence of disease.

2. Reasonable rotation to reduce the accumulation of bacteria. Planting in the field should be fertile and rich in organic matter, and before planting, water should be thoroughly watered and base fertilizer should be fully applied. 3000 kg of farm manure and 25% compound fertilizer should be applied per mu, and the soil should be disinfected by spraying disinfectant and new high-fat film 800x solution on the surface.

3. Reasonable close planting, good ventilation and light transmission, timely drainage after rain, high humidity prevention; adopting formula fertilization technology, applying more phosphorus and potassium fertilizer to improve disease resistance, while spraying 800-fold liquid of new high-fat film to form protective film to prevent bacteria from invading, and timely spraying Zhuangtuanling in the growth stage of leek can make leek stem stout, leaf thickening, leaf color fresh and tender, plant luxuriant, natural taste strong.

4. Cut as low as possible when harvesting. Pay attention to clean the border surface, spray 45% sulfur glue suspension 400 times liquid disinfection after harvest, at the same time, cooperate with spraying new high fat film 800 times solution to enhance the efficacy, improve the utilization rate of effective ingredients, and consolidate the control effect.

5. in the early stage of the disease, spray medicine in time. Spray 3000 times of 25% propiconazole EC or 3000 times of 25% tebuconazole water emulsion, 3000 times of 30% phenylether methyl propyl ring EC, 2000 times of 15% triadimefon wettable powder, spray once every 10 days, and control twice.

6. The seriously affected land can not be prevented by medicament, so it is best to cut the rhizome from the ground, spray fungicide once in the remaining rhizome, strengthen management, apply more fertilizer, speed up the growth of leek and make the leek grow again.