Bynum E D, Archer T L
Texas Agricultural Experiment Station, Rt. 3, Box 219, Lubbock, Texas 79403, USA.
Exp Appl Acarol. 2002;27(4):303-12. doi: 10.1023/a:1023328804511.
Banks grass mite, Oligonychus pratensis (Banks), from three Texas maize fields were assayed for bifenthrin resistance following poor field control in 1995. Laboratory bioassays showed the field mites to be 3- to 23-fold more tolerant to bifenthrin than the susceptible laboratory culture. Comparison of LC50 values to assays with bifenthrin from 1985 to 1993 indicated no statistically significant changes in mite resistance. However, high LC90 values in 1995 suggest possible resistance development. The percentages of resistant mites from the three fields in 1995 were calculated to be 4.7%, 17.9%, and 30.9%. The Banks grass mite population exhibiting the highest level of tolerance to bifenthrin was further assayed to evaluate tolerance levels to other insecticides alone and in combination with synergists and insecticides. A high level of tolerance existed in the 1995 'bifenthrin-selected' Banks grass mite strain to bifenthrin, dimeothate, and amitraz. The combination of bifenthrin or dimethoate with a synergist indicated changes in the ability of the more resistant 1995 mites to detoxify insecticides. The activity of a dimethoate + bifenthrin mixture and a three way mixture of dimethoate, bifenthrin, and piperonyl butoxide caused 5- and 38-fold increase in toxicity against the more resistant Banks grass mite.
1995年，得克萨斯州三块玉米田中的麦圆叶爪螨（Oligonychus pratensis (Banks)）在田间防治效果不佳后，被检测了对联苯菊酯的抗性。实验室生物测定表明，田间螨虫对联苯菊酯的耐受性比易感实验室培养物高3至23倍。将1985年至1993年联苯菊酯测定的LC50值进行比较，表明螨虫抗性没有统计学上的显著变化。然而，1995年的高LC90值表明可能出现了抗性发展。计算得出1995年三块田地中抗性螨虫的百分比分别为4.7%、17.9%和30.9%。对表现出对联苯菊酯耐受性最高水平的麦圆叶爪螨种群进一步进行测定，以评估其对其他杀虫剂单独使用以及与增效剂和杀虫剂组合使用时的耐受水平。1995年“联苯菊酯选择”的麦圆叶爪螨品系对联苯菊酯、乐果和双甲脒存在高耐受性。联苯菊酯或乐果与增效剂的组合表明，1995年抗性更强的螨虫解毒杀虫剂的能力发生了变化。乐果 + 联苯菊酯混合物以及乐果、联苯菊酯和胡椒基丁醚的三元混合物对抗性更强的麦圆叶爪螨的毒性分别增加了5倍和38倍。
