Root-knot nematode is a highly specialized omnivorous phytopathogenic nematode, which is mainly responsible for the roots of various vegetables. It is necessary to strictly implement the plant protection policy of prevention and prevention, and focus on agricultural and physical control methods. Chemical and biological control can be used to prevent damage. Let's take a look at the prevention and control of root-knot nematodes!
Root knot nematode damage characteristics
Root-knot nematode is the primary damage to the roots of various vegetables. It shows that the lateral roots and fibrous roots increase more than normal, and they form spherical or conical white nodules of different sizes on the roots of young roots, and some are beaded. The upper part of the victim plant grows low, slow, and the leaf color is abnormal, with few results, low output value, and even the early death of the plant.
Epidemiology of root knot nematodes
The life history of root-knot nematodes should be experienced in three periods: eggs, larvae and adults. Under suitable conditions, the egg is divided into about 20 cells by 2 days, then enters the blastocyst stage, and then passes through 2 days, enters the original intestinal stage on the 4th to 5th day, and then presents the oral needle 4 to 5 days later. The first instar larvae, through the ambush and the first molting, hatch out the second instar larvae. The second instar larvae are the only useful age for the infection of the root-knot nematode. The second instar larvae invade from the root tip of the plant, and develop into adults through two moltings. The male adults return to the soil, and the female adults lay eggs and progeny. Most of the root-knot nematodes carry out parthenogenesis. The egg, oocyst or 2nd instar larvae are overwintered in the soil with the diseased body. When the temperature reaches above 10 °C, the eggs can hatch out the larvae.
Root knot nematode prevention and treatment
1. Root-knot nematode is mainly distributed in the surface soil of 3-10 cm, rarely in the soil below 15 cm, and can be killed after 8-10 minutes at 55 °C. This characteristic can be used in In the summer season, fire, water flooding and high temperature diverticulum are used to eradicate.
2, the implementation of rotation and intercropping with green onions, garlic, every two years can be planted with a bunch of green onions or garlic, or between the main planting of the crops between the rows, intercropping garlic, garlic shoots, after harvesting, take the method of cutting the leek, Re-release of the roots for long-term preservation can significantly reduce the damage of root-knot nematodes, and can also reduce the occurrence and development of other diseases and increase greenhouse income.
3. The soil is supplemented with marine bio-triglyceride, phosphorus-potassium fertilizer and trace element fertilizer. The plant continuously sprays “marginal leaf foliar fertilizer †to ensure that the plant is strong and strong, and the shellfish fertilizer is specially increased. Glycans, which have the effect of nematodes, can be used to improve their resistance to root-knot nematodes.
4, when the wheat seedlings are planted, the flooding is flooding, and the mu Shi Changge 1#+2# each bottle can last for more than 4 months, or 16 bags of Shifu points, and the effective period can reach 2 months. Or use 2% avermectin 1kg for 2 to 3 bottles for one month, or apply 10% of granules for granules, 25000 grams per mu, to kill residual bacteria in the soil.
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