The latest course of garlic pest control techniques and methods

Garlic is a semiannual herb of the genus Allium in Liliaceae, which is commonly cultivated all over the country. Because garlic often has different symptoms, it can not be prevented and treated in time and correctly, resulting in serious disease and causing great losses. Let's take a look at the common pest control techniques of garlic.

Purple spot of garlic

[characteristics of the disease] most of the disease in the field began at the leaf tip or the middle of the pedicel, spread to the lower part a few days later, initially showed slightly sunken white spots, the center was slightly purplish, and enlarged into a yellow-brown spindle-shaped or oval spot. When the humidity was high, the disease part produced black mildew, that is, the pathogen conidiophores and conidia, and the disease spots had concentric wheel lines and were easy to break from the disease part. The neck of the infected bulb became dark yellow or reddish brown soft rot during storage.

[prevention and treatment methods] at the initial stage of the disease, spraying 75% chlorothalonil wettable powder 500 times or 64% chlorothalonil wettable powder 500 times, 40% Dafudan wettable powder 500 times, 58% metalaxyl manganese zinc wettable powder 500 times, 50% propofoin wettable powder 1500 times, once every 7 to 10 days, continuous prevention and control for 3 times, all have good results.

Garlic soft rot

[disease characteristics] garlic soft rot 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 the disease. 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.

[pharmaceutical control] before or at the initial stage of the disease, 72% agricultural streptomycin 3000 × 4000 times or 47% plus Ruinong WP750 times, 50% desenamine 1000 times, neoptomycin 3000 Mel 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.

Garlic leaf blight

[incidence characteristics] Leaf blight mainly occurs on leaves and pedicels, and mostly spreads from the leaf tip. The disease spot is a small white dot of flowers at the initial stage, and after expansion, it is an irregular shape or oval shape, showing a grayish white or grayish brown, producing black mildew. In severe cases, the diseased leaves die. If the pedicel is injured, it is easy to break from the disease, and give birth to many small black grains in the disease, resulting in garlic not easy to bolting.

[control methods] strengthen field management, reasonable close planting, increase the application of nitrogen, phosphorus and potassium comprehensive fertilizer, add biological multi-antibacterial fertilizer, cultivate strong seedlings, timely drainage after rain to prevent stagnant water in the field. It can be sprayed with 75% chlorothalonil or 65% Dysen zinc, 50% Ye Ku Jing powder 1000 times or 10% Chlorothalonil powder 400 times.

Garlic gray mold

[incidence characteristics] Botrytis cinerea often occurs in the later stage of plant growth, starting from the tip of the lower old leaf, the disease spot is water-immersed at the beginning, and then becomes white or light grayish brown, and develops from the tip to the in. when the disease spot is enlarged, it is called fusiform oval, and the disease spot produces gray-brown mildew on both sides. When the disease is serious, it can spread from the old leaves on the whole plant, causing the leaf sheath and even the underground bulb to collapse, then dry up and turn gray-white, and Botrytis cinerea and sclerotia can be seen in the disease part.

[control method] the control method is basically the same as that of leaf blight.