The root-knot nematode invades the tip of the young root of the grape with the 2nd instar larvae, and forms a root knot on the root or growth root. When the infection is serious, the root has almost no absorption root or few, the growth of the shoot is slow, the tree is weak, and the performance is short. Yellowing, wilting, small fruit, etc., occur in most grape producing areas in China, and sandy loam is particularly heavy. It is necessary to timely carry out pesticide control. Prepainted Color Coils,Pvdf Coil,Color Prepainetd Coil Prepainted Steel Coil/sheet/strip Roofing Sheet Co,Ltd , http://www.nssteelcoil.com
Control coup:
1. Garden selection. When selecting the garden, the former crops avoid the good hosts of nematodes such as tomatoes, cucumbers, and deciduous fruit trees. It is best to plant the soil of the grass crops for 4 to 5 years.
2. Choose quarantine. For resistant varieties or rootstocks, Dogridge, Ramsey, etc. have been selected. Strict quarantine, no introduction of seedlings from the ward, it is necessary to introduce strict sterilization.
3. Soil fumigation. Soil fumigation before planting, commonly used are sulfuryl fluoride, 1,3 -D, dibromomethane and so on.
4. Insecticides. The young plants that have developed disease should be removed and burned in time, and the diseased soil should be exposed to the sun. After the colonization, it can be used to control the further spread of the nematode special insecticides such as chlorpyrifos, ketone, kedan, and miller.