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1969年是桐庐地区三化螟严重发生的一年,发生量超过常年,特别是部分地区三化螟对六六六产生明显的抗药性,第三代防治后枯心率仍较高,虫口残留量大,造成第四代发生量特大(一般每亩有卵块1740块,高的有3930块),发生期提早,分布面积大,严重威胁晚稻丰收的局面。在严重的虫害面前,全县广大贫下中农和革命干部,在县革委会的正确领导下,高举毛泽东
1969 is a serious occurrence of the three borer in Tonglu area, occurring more than perennial, especially in some areas Borer bore resistance to six hundred sixty-six, after the third generation of control is still high heart rate, residual population Large, resulting in the fourth generation of large (typically 1740 eggs per mu, 3930 high), the occurrence of early, large distribution area, a serious threat to the harvest of late rice. In the face of serious insect pests, the vast majority of poor and middle-level peasants and revolutionary cadres across the county, under the correct leadership of the county revolutionary committee, held high Mao Zedong