茶园用药对假眼小绿叶蝉天敌缨小蜂的影响

Effect of Pesticides on Egg-parasitoid of Tea Green Leafhoppersat Tea Gardens

采用田间扫网、镜检的方法检查缨小蜂的虫口数量和寄生率,评价茶园几种农药唑虫酰胺、茚虫威等对假眼小绿叶蝉天敌缨小蜂的影响。结果表明化学农药15%唑虫酰胺EC、15%茚虫威EC、2.5%联苯菊酯EC对缨小蜂虫口数量的影响表现为药后3d缨小蜂虫口数量比清水对照显著下降,缨小蜂寄生率表现为3种化学农药药后14d、21d均极显著低于清水对照。唑虫酰胺、联苯菊酯处理区缨小蜂寄生率均低于0.5%藜芦碱SL处理区。15%唑虫酰胺EC、15%茚虫威EC对假眼小绿叶蝉防治效果速效性和持效性均较好、3种化学农药对缨小蜂的影响高于生物农药藜芦碱,表明在缨小蜂生长繁殖期,农药的使用降低了田间缨小蜂的种群数量和寄生率。

This study aimed to evaluate the effect of several pesticides used at tea gardens for controlling the tea green leafhoppers（TGLs）on mymarids,a TGL-egg-parasitoid.Sweeping nets and microscopic examination were used to determine the count and parasitism of mymarid population at the sites.It was found that 15% tolfenpyrad EC,15% indoxacarb EC and 2.5% bifenthrin EC significantly reduced the mymarid count as compared to CK（spread with water）after a 3-daypesticide treatments.The parasitism rates of mymarid on the 14 thand the 21 st day after treatments with the pesticides were also significantly lower than CK.The pesticides,15%tolfenpyrad EC and15%indoxacarbEC,were effective and fast in controlling TGLs.All 3 pesticides showed a greater effect on mymarids than the biopesticide,veratridine.It appeared that application of these pesticides negatively affected the population as well as the parasitism rate of mymarid.