梅棠乡地处我县丘陵山区。历年主要发生病虫害有二化螟、三化螟、稻纵卷叶螟、稻蓟马、稻苞虫、浮虫子、稻飞虱、负泥虫及稻瘟病、自叶枯病、纹枯病、赤枯病、胡麻叶斑病等。近几年来,由于实行生产责任制,农民任意串换水稻种子,致使品种繁多 Meitang Township is located in my county hilly. The main pests occurring in the past years are the rice stem borer, Borer, Cnaphalocrocis medinalis, rice thrips, rice shell insects, bugs, planthoppers, negative mud and rice blast, blight, Bacterial blight, flax leaf spot and so on. In recent years, due to the implementation of the system of production responsibility, farmers arbitrarily exchange rice seeds, resulting in a wide variety