Rice aphids are also known as white tip disease and nematode withered disease. Distributed in various rice areas in China. The symptoms at the seedling stage were not obvious. Even when the leaves were in 4-5 leaves, the tips of the leaves appeared white and dry and twisted. The dry tip of the diseased plant was more serious after the booting. The tip of the flag leaf or the lower 2-3 leaf tip of the flag leaf gradually turned yellow, translucent, twisted to dry tip, turned gray or light brown, and the boundary between the diseased and healthy parts was obvious. When there is a high degree of humidity and fog, the dry tip leaves are translucent and water-stained. When the wind blows, they dry and then curl again. Some diseased plants did not show symptoms, but rice ear with nematodes, most plants can normally heading, but the plants are short, the panicles are smaller, and the grains are more, more infertile and the ears erect.
Control methods:
1. Select disease-free seeds, strengthen quarantine, and strictly prohibit the transfer of seeds from the ward.
2, seeds soaked in warm soup, first pre-immersed in cold water in rice for 24 hours, and then placed in 45 ~ 47 °C warm water for 5 minutes to warm, then put in 52 ~ 54 °C warm water soak for 10 minutes, remove immediately cooled, In germination, 90% control effect. Or soaking with 0.5% hydrochloric acid solution for 72 hours, soaking seeds and washing with water 5 times. Or 40% of creatine (ethyl acetate) EC 500 times, soaking seeds of 50 kg, soak for 24 hours, then rinse with water. Or use 15 grams of EC 0.5 kg and add 500 kg of water. Soak for 48 hours. Rinse after germination. When soaked with warm soup or pharmaceutics, the germination potential tends to decrease. If the live broadcast is apt to cause bad or rotten pods, it is necessary to promote buds.
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