Control methods of root-knot nematode

Root-knot nematode is a highly specialized omnivorous plant pathogenic nematode, which mainly harms the roots of all kinds of vegetables. we must strictly implement the plant protection policy of giving priority to prevention and comprehensive control, focusing on agricultural and physical control measures. in order to effectively prevent its harm, let's take a look at the prevention and control methods of root-knot nematode.

Harmful characteristics of root-knot nematodes

Root-knot nematode mainly harms the roots of all kinds of vegetables, showing that lateral roots and fibrous roots are more than normal, and white nodules of spherical or conical sizes are formed on the fibrous roots of young roots, and some are beaded. The aboveground growth of the injured plant was short, slow, abnormal leaf color, less fruit, low yield, and even caused the plant to die early.

Epidemiology of root-knot nematodes

The life cycle of root-knot nematode goes through three stages: egg, larva and adult. Under suitable conditions, the egg divides into about 20 cells after 2 days, then enters the blastocyst stage, and then enters the progut stage after 2 days, 4-5 days, and the first instar larvae are formed after 4-5 days, and then after resting and molting for the first time, the second instar larvae are hatched after breaking the shell. The second instar larvae are the only effective instar for root-knot nematodes to infect plants. The second instar larvae invade from the root tip of the plant and develop into adults after molting twice. The male adults return to the soil, and the female adults lay eggs and reproduce. Most root-knot nematodes only parthenogenetic. The eggs, oocysts or the 2nd instar larvae overwintered in the soil with the disease residue. When the temperature reached more than 10 ℃, the eggs could hatch the larvae.

Control methods of root-knot nematode

The main results are as follows: 1. Root-knot nematodes are mainly distributed in the surface soil of 3 cm and 10 cm, and rarely exist in the soil below 15 cm. They can be killed in 8 minutes at the temperature of 55 ℃. This characteristic can be eliminated by burning, flooding and high temperature chamber during the summer season.

2. The rotation and intercropping with onions and garlic can be planted every two years, or the garlic seedlings can be intercropped between the rows of the main vegetable crops. After the garlic seedlings grow, the harvesting method of cutting leek, leaving roots and reproducing them for a long time can obviously reduce the harm of root-knot nematodes, reduce the occurrence and development of other diseases, and increase greenhouse income.

3. The soil was added with Haisheng three element organic fertilizer, phosphorus and potassium fertilizer and trace element fertilizer, and the plant was continuously sprayed with "Haisheng foliar fertilizer" to ensure that the plant was strong and strong, and the oligomeric chitosan specially added by Haisheng series fertilizer could inhibit nematodes and effectively improve its stress resistance to root-knot nematodes.

4. Flood irrigation during seedling planting, one bottle per mu of Changge, or 16 bags of Fuqi per mu, the duration of effect can reach 2 months, or 2% avermectin 1kg filled 2-3 bottles for one month, or 10% Manku granule, 25000 grams per mu, to kill the residual protozoa in the soil.