保护地常用农药对蜡蚧轮枝菌菌丝生长影响研究

6种杀虫剂和 6种杀菌剂对昆虫病原真菌蜡蚧轮枝菌菌丝生长影响的研究结果表明 ,杀虫剂对蜡蚧轮枝菌菌丝生长有程度不同的抑制作用。在田间常规使用浓度下 ,5种杀虫剂对菌丝生长的抑制率在 10 %以上 ,最高者为甲氰菊酯达 17.6%。田间常规使用浓度稀释 10倍下 ,杀虫剂万灵、快灭净和锐劲特对菌丝生长抑制率低于 5% ,锐劲特在3.3～33.3mg/L时 ,菌丝生长与对照无显著差异 ,表现出与蜡蚧轮枝菌有极好的相容性 ,是菌药混用较好的候选杀虫剂。杀菌剂对蜡蚧轮枝菌菌丝生长有强烈的抑制作用 ,浓度愈高 ,抑制程度愈强。因此 ,在利用蜡蚧轮枝菌防治保护地蔬菜害虫时 ,须与杀菌剂使用保持一定的间隔期

The effect of commercial chemicals on the mycelia growth of Verticillium lecanii in protected areas

The effect of 12 chemical pesticides (6 insecticides and 6 fungicides) widely used in protected culture were investigated on entomopathogenic fungus Verticillium lecanii mycelia growth. Results showed that the insecticides inhibited the mycelia growth to a certain degree. In the field spray concentrations recommended, the rates of inhibition of mycelia growth by 5 insecticides except fipronil 5% FF could exceed 10%; among them fenpropanate 20% EC exhibited the strongest inhibition with the inhibition rate of 17.67%. Methomyl 90% WP and imidacloprid 10% WP exhibited good compatibility with V. lecanii; there was no differrece for mycelia growth between control and treatment by fipronil 5% FF with dose 3.3-33.3 mg/L, showing highly compatible with V. lecanii, and suggesting a good candidate for combined use of chemical and fungal insecticide. In addition, different strains were differently susceptible to a given insecticide. All fungicides strongly inhibited mycelia growth, it is suggested that using V. lecanii against insect pests should be a period interval with fungicides applied.