Maize nematode disease
Symptoms of the roots of the corn damaged by parasitic nematodes caused the development of the root group to be inhibited, the number of roots was reduced, the growth of the shoots was poor, serious plant dwarfing and yellowing occurred, and the yield was greatly affected. Root-knot nematodes can cause tumors, root nematodes cause brown spots, and severe rot.
Pathogen Pratylenchus scribneris Steiner. Called Scribner short nematode, a parasitic plant nematode. Cylindrical, small, constricted lip area, with 2 lip rings, ovoid cystic sac, short and undifferentiated uterine sac, broad rounded and acyclic tail, with 4 engraved lines, male rare. In addition P. Zeae, Meliodogyne sp. Helicotylenchus sp, Aphelenchoides sp. And so are all corn parasitic nematodes. The nematode hosts a wide range of insects and can damage 14 families and 80 species of plants.
Transmission routes and disease conditions After harvest of corn, nematode larvae and eggs are scattered in soil or manure to overwinter and become the first year of the leap year.
Dye sources; can also be carried by humans, livestock and agricultural implements, and spread mainly in irrigation water and rainwater in the fields.
Control methods (1) Before the harvest, remove the diseased body promptly, concentrate burned, deep-turn 50cm, rise from high ridge 30cm, flood the trench, cover the mulch, seal for 15-20 days, heat and flood, control effect 90 %the above. (2) Ammonia fumigation can be used before greenhouse corn cultivation. Liquid ammonia is used at 30-60kg per 667m2. Before planting or planting, it is mechanically applied to the soil. After 6-7 days, it is deeply turned and ventilated to release ammonia. 2 - sowing or planting after 3 days. (3) Crops with severe disease on the rotation should be planted with onions, garlic, leeks, aquatic vegetables or grass crops for 2-3 years. (4) If necessary, use 3% Milur granules, 1.5-2.0kg per 667m2 or drop mix, 20kg per 667m2, withdraw from the open ditch 15 days before planting, cover soil, pressure In fact, 2 to 3 days before planting, the ditch is deflated to prevent phytotoxicity. In addition can also be used 95% cotton, 667m2 dose of 3-5kg or 3% methyl isofluosad granules 10-15kg. But pay attention to prevent phytotoxicity and poisoning.
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