Root knot nematode disease and its control

1. Symptoms only harm pepper roots. After the roots were damaged, they formed a malignant tumor-like nodule. At the beginning of the disease, there were no obvious symptoms on the ground. The severely diseased plants grow weak and dwarf in the upper part of the plant, and the color of the leaves becomes lighter, resulting in fewer and smaller results. Slight wilting often occurs in dry or sunny midday, and can wither when severe.
2. The onset condition was caused by the invasion of the southern root-knot nematode. After invading the host plant, the root cells were stimulated to proliferate to form root knots or tumors. The larvae living inside the tumor developed into adult worms three times. After mating of male and female adults, females spawn in glial oocysts, often outside the tumor. After maturity, leave the plant roots in the soil and re-infect or overwinter in the soil.
3. Prevention and control methods are implemented in rotation. It is best to use paddy crop rotations. Strengthen cultivation management. The use of insect-free seedlings, deep-turning the soil, promote the death of root-knot nematodes. Apply more organic fertilizer and strengthen management.
Chemical control. When combining soil preparation with 0.3 kg of 3% milar granules per acre, or 0.3 kg of 10% force full reservoir, or 0.5 kg of 50% phoxim emulsion, diluted 1000 times after site preparation , Ground spraying, planting every 2 to 3 days. In the early stage of disease, use 70% pentachloronitrobenzene wettable powder plus 50% phoxim, 1:1:1000 times water leaching root, 0.1 kg per barrage, once every 7 to 10 days, Use 2 times.

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