Control Techniques of Garlic Main Diseases

Due to the different symptoms of garlic, the prevention and treatment of garlic can not be carried out timely and correctly, which leads to serious disease and great losses. Remind garlic farmers to do a good job in prevention and control of the following diseases:

1. Purple spot disease: most of the disease in the field begins at the leaf tip or the middle of the pedicel, spreads to the lower part after a few days, shows slightly sunken white spots at the beginning, the center is slightly purplish, and the enlarged spot is yellow-brown spindle-shaped or oval-shaped disease spot. When the humidity is high, the disease part produces black mildew, that is, the pathogen conidiophores and conidia, and the disease spots have concentric wheel lines, which are easy to break from the disease part. The neck of the infected bulb became dark yellow or reddish brown soft rot during storage. At the initial stage of the disease, spray 75% chlorothalonil wettable powder 500 times or 64% disinfectant alum 500 times, 40% Dafudan 500 times, 58% metalaxyl? Manganese and zinc wettable powder 500x liquid, 50% prohydantoin wettable powder 1500 times liquid, once every 7 to 10 days, continuous prevention and treatment for 3 times, all have good results.

2. Garlic leaf blight: it is a fungal disease, which mainly harms leaves. In the early stage of the disease, the disease spot gradually developed from the leaves of garlic to the leaf stem, and spread upward from the lower part of the plant. The disease spot is a small pale round spot at first, and then gradually expands into grayish brown, showing an oval irregular shape. When the disease is serious, it can cause the whole leaves of garlic to wither and die. The disease site of garlic with leaf blight is often accompanied by black mildew, and there are many small black spots on the disease spot. After garlic is infected with leaf blight, timely control measures should be taken to prevent the expansion and spread of the disease. 150 grams of carbendazim glue suspension and 150 grams of potassium dihydrogen phosphate can be used per mu, and garlic seedlings are evenly sprayed 2-3 times, once every 7 days or so. It can also be sprayed 2-3 times evenly with 80% Dysen zinc 600,800 times or 75% chlorothalonil 600,800 times or 50% isobarbazide wettable powder 1500 times, about once every 7 days.

3. Garlic soft rot: it is a bacterial disease, which is beneficial to the disease with low temperature and high humidity. After garlic infection, the disease first occurs from the leaf margin or midrib, and forms yellow-white stripes along the leaf margin or midrib, which can run through the whole leaf. When the humidity is high, the diseased part is yellowish brown and soft rot. In general, the foot leaves first fell ill, and then gradually expanded to the upper leaves, resulting in the withering and yellowing or death of the whole plant. Pest control and disease prevention: because pests cause wounds on garlic, which is conducive to the invasion of soft rot bacteria, some pests carry germs in and out of the body and directly spread diseases. Therefore, the control of insect pests is very important for the control of soft rot. Attention should be paid to the control of underground pests such as golden needle worm and mole cricket in the early stage, and yellow should be controlled from the seedling stage. Curly striped jumper beetle, maggot and other pests. Drug control: 72% agricultural streptomycin 3000 × 4000 times or 47% plus Ruinong WP750 times can be used before or at the initial stage of the disease, 50% desenamine 1000 times, neopytomycin 3000 min 4000 times, spray once every 5 to 7 days, continuous prevention and treatment for 2 times according to the disease. Emphasis should be placed on the mildly diseased plants and the plants around them, and attention should be paid to spraying on the base of the stems close to the surface.