20世纪 80年代水稻二化螟在东台市常年重发生， 90年代应用沙蚕毒素类杀虫剂——杀虫单以后，二化螟的发生程度逐年下降， 1997年，其发生数量下降至 90年代以来最低水平。然而，由于长期反复使用单一农药，二化螟对杀虫单产生了较强的抗性。 1998年以后，本市二化螟的发生数量 In the 1980s, the occurrence of rice stem borer (STI) occurred frequently in Dongtai City in the 1980s. The occurrence of STI was reduced year by year in the 1990s when the nereistoxin insecticide-insecticidal single was applied. In 1997, the occurrence of STI was reduced to 90 The lowest level since the age. However, because of long-term repeated use of a single pesticide, Sesamia inferens produce strong resistance to pest orders. After 1998, the number of occurrence of Chilo suppressalis in the city