Symptoms: Also known as peanut root nodule nematode disease. Commonly known as yellow disease, land fall disease, jaundice and so on. The second-instar larvae invade young root tips of peanuts and form irregular root knots. The nematode penetrates into the root column of peanuts to cause leakage of root fluids and loss of nutrients, which can easily cause secondary diseases. Root-knot nematode colonizes feeding and stimulates proliferation of root cells, continuously injure new root tips, makes secondary roots cluster (root clusters), and absorbs nutrients. The diseased plants grew slowly or chlorosis was not long, the plants were short, the leaves at the beginning of flowering period were yellowing and thin, the margins of the leaves were scorch, falling off earlier, the flowers were small and the flowering was late, and the results were few or ineffective. Nematodes can also invade the husks, stalks, and rhizomes. The fruit husks suffer from the formation of nodules, and the posterior worms are brown and sore, but they are rare. Stems and rhizomes form clusters of grape nematodes. Control methods: (1) Chemical control uses 10% defense line No.1 emulsifiable concentrate, 2-2.5 kilograms per mu, and 20 kilograms of fine soil are made into poisonous soil and scattered into soil after sowing. Or use 10% aldicarb (iron extinct g) granules 2.5-5 kg, 3% carbofuran (keweiwei) granules 5-6 kg, 5% sulphur-phosphorus (Kedandan) granules 8 kg, 5% of Milor granules 3.6 kilograms, can also be used 10% methyl iso-isocyanate, thiophosphoric acid, phosgic granules 4-6 kilograms, sowing seeds to be layered to prevent injury. At the same time pay attention to human and animal safety. Carotenoids such as carbofuran are used as seed coating agents. Seeds are treated 2 days before sowing. The concentration of the liquid should be above 30%. Fumigants can be used to control DD mixture, ethylene dibromide (EDB), cotton wool (must be extinguished) and so on. (2) Biological control Application of Paecilomyces lilacinus and Verticillium chlamydospora can significantly reduce the nematode population and eliminate its eggs.
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