Prevention and treatment of garlic virus disease in curled heart leaves

Garlic virus disease, also known as mosaic disease. Generally speaking, 100% disease of garlic in the field is one of the main causes of garlic degradation. Because of the asexual reproduction of garlic, the reproduction coefficient is low, the control is difficult and the loss is great.

Garlic virus disease

Symptoms: garlic can show symptoms from seedling stage to adult stage. Typical symptoms: there are obvious yellow chlorotic stripes on the leaves, which vary in length, the diseased plants are dwarfed in varying degrees, the growth is slender and thin, the wax of the leaves decreases or disappears, and the luster is lost. The leaves of seriously diseased plants were semi-curly, and some of the upper and lower leaves were twisted and crimped in a barrel shape, and the heart leaves could not be extracted. Seriously diseased plants can not bolting, even if bolting, there are obvious chlorotic spots on garlic bolts. The root system of diseased plants developed poorly, the roots were short and few, and the garlic became smaller obviously.

Transmission routes and conditions: garlic virus disease is mainly transmitted by garlic cloves. Aphids, nematodes and other viruses can also be transmitted by friction. As garlic uses bulbs as sowing material, the virus-carrying rate is 100%. Therefore, after sowing garlic cloves with poison, they have been infected after emergence, but the severity of the disease varies. As a result, all the garlic in the field is infected by the virus, causing the garlic to deteriorate seriously and become smaller.

Prevention and control methods:

1. Strict seed selection: choose large garlic cloves, large and neat cloves, hard cloves, white color and fresh seeds. If there are conditions, you can choose virus-free garlic species.

2. Agricultural prevention and control: fully apply organic fertilizer, circle manure and cake fertilizer are better, and increase phosphorus and potassium fertilizer. Generally, 5000kg / mu of rotten manure and 70kg / mu of soybean cake or cottonseed cake should be used as base fertilizer, and topdressing should be made during the growing period. The first topdressing is before and after the Qingming Festival, 25,30kg ammonium sulfate is applied per mu, when garlic bolts are shedding tassel, the second topdressing is applied, nitrogen, phosphorus and potassium compound fertilizer 25,30kg per mu, formula fertilizer and foliar fertilizer are advocated. Reasonable watering, implementation of plastic film mulching, promote growth, avoid premature senescence of garlic, improve disease resistance of garlic.

3. Chemical control: at the initial stage of the onset of garlic, choose 20% virus Kexing 400x liquid, or 20% virus A wettable powder 500x liquid, or 1.5% Zhitanling emulsion 1000 times liquid, or antiviral agent No. 1 250x 300 times liquid spray, once every 10 days, spray 2 times 3 times.