White Nematode in Plant Dwarf Disease Control Method for Strawberry Parasitic Nematode

The individual nematode is small and not easy to be found. the symptoms of strawberry damage are easily mistaken for virus disease or physiological disease, so that the drug can not be used correctly, which seriously affects the quality and yield of strawberry. The symptoms and effective control techniques of strawberry nematode are introduced as follows.

Strawberry nematode disease

First, symptoms:

1. Foliar nematode disease. Nematodes do not invade strawberry tissue, but feed on developing buds and leaves. After the leaf unfolds, it shows wrinkle and twist, which is smaller than the normal leaf. Nematodes destroy fruit buds and cause a decline in strawberry production. When nematodes were co-infected with pathogens, strawberry plants showed shoot dwarfing and shrunk into fleshy lotus bushes about 1cm.

2. Root knot nematode disease. The damaged strawberry root system has root knot of different size, cut open the diseased tissue, there are many small milky nematodes, the root system is underdeveloped, the lateral vegetative root proliferates, and the aboveground growth is weak.

3. Root rot nematode disease. The young plants are hard and brown, and there are oval disease spots on the adult roots, from yellow brown to black brown. Strawberry shoot is dwarf, lack of vigor, low yield and strong sensitivity to soil drought.

4. Stem nematode disease. The petiole is raised, the leaves are twisted, the galls are formed in the fruit of flowers and strawberries, and the plants are dwarfed. Dissecting the malformed tissue, a large number of nematodes can be seen in the cortex or parenchyma.

Second, prevention and control technology:

1. Biological control. Use the natural enemies of nematodes in the soil-fungi and bacteria. The beneficial bacteria were introduced into the diseased strawberry plant to destroy the nematode contents and kill the nematode. Or before planting, the planting hole was irrigated with 1.8% avermectin 3000 times solution, 3000-0.25kg per hole, and then planted with soil cover, the control effect was 85% 90%.

2. Physical control. Before planting strawberries, soak the dormant mother plant in 46-55 ℃ warm water for 10 minutes to eliminate nematodes.

3. Strengthen the cultivation management. Eliminate diseased bodies and weeds and concentrate on burning. Add organic matter to the soil, maintain soil fertility, reasonable irrigation, cultivate strong seedlings, and enhance the resistance and tolerance of strawberry plants. In seriously affected plots, rotation with onions, garlic, leeks, aquatic vegetables or gramineous crops for 2-3 years can effectively inhibit nematodes.

4. Chemical control. In the land with a history of disease, before strawberry planting, 3% millol granules 1.5-2.0kg or 10% gram phosphorus granules 2-4kg were used per mu, and the control effect was 85% 95%.