浙江省马尾松毛虫抗药性监测

由于化学防治马尾松毛虫的历史较久,马尾松毛虫(Dendrolimus punctatus Walker)产生了抗药性,拟除虫菊酯类新农药具有高效、低毒、低残留等优良特性,但自1981年使用以来,其杀虫效果不断降低,而用药量逐渐增加。我们自1984—1986年对全省12个县、20多个地方作了马尾松毛虫抗药性监测工作。结果表明:松毛虫对拟除虫菊酯类的抗药性与过去使用有机氯、有机磷等农药的量成正相关,合理控制拟除虫菊酯类农药的用量能延缓抗性的发生。

STUDIES ON THE RESISTANCE OF THE MASS ON PINE CATERPILLAR (DENDROLIMUS PUNCTATUS WALKER) TO INSECTICIDES

The masson pine caterpiller (Dendrolimus punctatus Walker) is the most important pest of the massin pine, Pinus massoniana, in our country. It is widely distributed in southern of China. In the pest, the insecticides such as BHC, DDT, Trichlofon etc. was frequently used in its control. Nowaday, the pyrethroids (e. g. Decamethrin and Fenvalerate etc.) have been used in many places to replace the Chlorinated hydrocarbon insecticides and the synthetic organic pesticides. However, owing to the abuse of insecticides, the problem of resistance is becoming a serious matter. The results of the laboratory tests showed that, in Lixai, Jimhua-Liging, Vanlin, Juzhou-Hangpu, Juzhou-Hengluzhu, Jinhua-Gufang province etc., the resistance to the Trichlorfon of the insect population had increased by21. 45, 26. 07, 26. 38, 27. 60, 27. 98, 55. 28 times compared with that of the insect population in Rongkang province (Table 2). In Jinyin-Chenbe, Rongcan-pidin, the resistence to the Decamethroin of the insect population had increased by 40.38, 49.40 times campared with that of the insect population in Huang Yin-Yaochang (Table 3). The results also showed that there is a resistance at different levels arising in the insect populations according to the dosage used in different places, (Table 4).