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用改进的蛭石萝卜苗法饲养小菜蛾,以点滴法处理对杀虫双、杀螟丹两种药剂淘汰选育的小菜蛾抗性品系和不以药剂处理的敏感品系的各项生物学特性与同期田间种群比较,各品系间差异不显著,均没有生长发育和繁殖上的不利情况.5年来药剂淘汰选育,杀虫双品系至F_(85)代其抗性增长178倍;杀螟丹品系F_(80)代其抗性增长87倍,均已形成高抗品系.两个抗性品系经停止药剂淘汰选育后5代,抗性倍数分别从167倍降至57倍和74倍降至16倍,说明这两个抗性品系的抗性是不稳定的,在没有药剂选择压力的情况下,开始几代抗性下降较快,当下降到一定水平后抗性便比较稳定,似乎很难恢复原有的敏感性.
The modified vermiculite radish seedling method was used to feed the diamondback moth. The biological characteristics of the resistant and susceptible strains of diamondback moth, Plutella xylostella, which had been eliminated by insecticidal double and cartap killing, Compared with the field population in the same period, there was no significant difference among the strains, and there was no unfavorable condition on growth and reproduction.In the past five years, the resistance of the bivalent insecticide to F_ (85) The resistance of Dan line F_ (80) increased by 87-fold on behalf of its resistance strain, and all of the resistant lines had formed high resistant lines.The resistant lines of resistant lines decreased from 167 times to 57 times and 74 times Down to 16 times, indicating that the resistance of the two resistant strains is not stable, in the absence of choice of pharmaceutical pressure case, the rapid decline of the first few generations of resistance, down to a certain level after the resistance will be more stable, It seems difficult to restore the original sensitivity.