智利小植绥螨与联苯肼酯单独和联合防治草莓二斑叶螨田间防效

Field Control Effect of Phytoseiulus persimilis(Acari:Phytoseiidae),Bifenazate and Their Combination on Two-spotted Spider Mite Tetranychus urticae(Acari:Tetranychidae) on Strawberry

以二斑叶螨为防治对象,在二斑叶螨自然发生程度较轻、中等和严重的草莓棚中,采用释放智利小植绥螨、喷洒43%联苯肼酯3 000倍液和二者联合使用技术进行处理,评价不同防控措施对草莓二斑叶螨的防治效果,以期为草莓二斑叶螨的绿色防控提供技术支撑。结果表明:二斑叶螨发生程度较轻的区域释放智利小植绥螨后,不同时期的防治效果均在88%以上,最高防效99.25%。二斑叶螨发生程度中等的区域释放智利小植绥螨的防治效果较慢,但后期的防治效果优于化学防治的效果。在叶螨发生严重的区域采取联合防治措施,第一次处理后7d的防效仅为51.55%,间隔6d第二次防治后第14、21、28、35、42天的防效逐渐升高。根据二斑叶螨发生危害程度采取不同的防治措施均可以得到较好的防控效果。建议在叶螨处于低密度时释放智利小植绥螨进行防治,高密度时先用联苯肼酯喷雾防治以压低叶螨基数,再释放智利小植绥螨。

Tetranychus urticae（Acari：Tetranychidae）was used as control object,in strawberry greenhouse with slight,moderate and serious damage by Tetranychus urticae,the control effects of releasing Phytoseiulus persimilis（Acari：Phytoseiidae）,spray of 43% bifenazate 3 000 times dilution and their combination treatments on Tetranychus urticae were studied in order to supply technology support for control Tetranychus urticae.The results showed that release of P.Persimilis to the slightly damaged strawberry by TSW showed high control efficiency,with values above 88% at different survey period and the highest value of 99.25%.Release of P.persimilis to the moderately damaged strawberry by TSW showed slow control efficiency in earlier days,but became better than that of spraying bifenazate in the later days.Combined method of biological and chemical controls applied to the moderately damaged strawberry by TSW showed low control efficiency of 51.55%after the first treatment,but the value increased with time after the second treatment,6days after the first treatment.The control efficiency was high on the TSW when control method was applied according to the level of damage by the TSW.It was recommended that release of P.persimilis when the density of the TSW was low,the spray of bifenazate followed by release of P.persimilis when the density of the TSW was high.