广赤眼蜂对黄野螟田间持续防治效果初报

Preliminary Report on the Continuous Field Control Effect of Trichogramma evanescens on Heortia vitessoides

为了解广赤眼蜂对黄野的田间持续防治效果,调查了3块放过赤眼蜂的沉香树林地和1块未放过赤眼蜂的沉香树林地。结果表明:放过蜂的林地赤眼蜂对黄野螟卵的平均寄生率可达50%以上,蜂群数量足够控制幼虫发生,沉香树失叶率不到10%,持续防控效果良好。相比未放蜂林地,虽然平均寄生率可达30%,但蜂群数量太少,致使大部分黄野螟卵顺利孵化出幼虫,不能有效控制黄野螟发生数量,最终造成沉香树严重失叶。建议在沉香树林地大力推广科学监测和应用广赤眼蜂以达到绿色高效防控黄野螟的目的。

In order to understand the continuous control effect of Trichogramma evanescens on Heortia vitessoides in the field,three Aquilaria sinensis woodlands with T.evanescens released and one A.sinensis woodland without T.evanescens released were investigated.The results showed that in the three A.sinensis woodlands with T.evanescens released,the average parasitism rate of T.evanescens on H.vitessoides eggs reached over 50%,and the number of T.evanescens was sufficient to control H.vitessoides larvae.The defoliation rate of A.sinensis trees was less than 10%,indicating good continuous control effect.Compared to the A.sinensis woodland without T.evanescens released,although the average parasitism rate can reach 30%,the population number of T.evanescens was too small,causing most of H.vitessoides eggs to smoothly hatch and left ineffectively control effect,which ultimately resulted in severe defoliation of A.sinensis.It is recommended to vigorously promote scientific monitoring and application of T.evanescens in A.sinensis forests to achieve the goal of green and efficient control of H.vitessoides.