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采用浸叶接虫法及饲料混毒法 ,测定了苦皮藤根皮提取物苦皮藤素对棉铃虫抗性品系 (对氰戊菊酯抗性倍数为 2 42 8、对辛硫磷抗性倍数为 44 4倍 )和敏感品系的毒力 ,结果表明 ,苦皮藤素对抗性品系棉铃虫的拒食中浓度和抑制生长中浓度分别为敏感品系的 2 95和 2 2 8倍。因此 ,抗有机磷及菊酯类农药的棉铃虫品系对苦皮藤素仍有其相应的敏感性。
Using the leaf-dipping method and the feed-mixing method, the effects of cetopalin from Borte sinensis root on Helicoverpa armigera resistance (resistance to fenvalerate was 2 428, resistance to phoxim And the virulence of the susceptible strain. The results showed that the antifeedant concentration and inhibitory concentration of cephalosporin-resistant cotton bollworm strain were 295 and 228 times of the susceptible strain, respectively. Therefore, anti-organophosphate and pyrethroid insecticidal strains of cotton bollworm cephalosporins still have their corresponding sensitivity.