香榧瘿螨物种鉴定及防控技术研究

Species Identification and Control Technology of Eriophyoid Mite on Torreya grandis‘Merrillii’

为了鉴定危害香榧Torreya grandis‘Merrillii’的瘿螨Eriophyoidea物种和发展瘿螨防控的技术,采用形态学鉴定法对香榧瘿螨进行物种鉴定,采用林间生物测定法测定了15%哒螨灵、3%甲维•虱螨脲、5%阿维菌素和21%阿维•螺螨酯4种杀螨剂以及加州新小绥螨Neoseiulus californicus对香榧瘿螨的防治效果。结果表明,危害香榧的瘿螨为冷杉纳氏瘿螨Nalepella abiesis;冷杉纳氏瘿螨在浙江省衢州市香榧实验林内的虫口密度在16.84~30.84(头·片叶-1);药剂防治结果表明,21%阿维•螺螨酯和15%哒螨灵在推荐浓度下对冷杉纳氏瘿螨的防治效果在87.00%以上,高于5%阿维菌素和3%甲维•虱螨脲的防治效果;加州新小绥螨对冷杉纳氏瘿螨的卵、若螨和成螨均具有捕食功能,其在林间的防治效果为55.93%。生产中应将化学农药与加州新小绥螨联合使用,从而达到高效防控冷杉纳氏瘿螨的目的。以上研究结果为冷杉纳氏瘿螨的高效防控提供了科学依据。

In June 2020,branches of Torreya grandis‘Merrillii’with eriophyoid mite was collected in stand of Fuyang,Zhejiang province for identification and observation of morphology.In October 2021,15%pyridaben,3%emamectin benzoate·lufenuron,5%abamectin,and 21%abamectin·spirodiclofen was applied and Neoseiulus californicus were released in stand of Quzhou,Zhejiang province to control experiment.The results showed that the eriophyoid mite was N.abiesis.The population density of N.abiesis in Quzhou ranged from 16.84 to 30.84 heads/leaf.The chemical control demonstrated that 21%abamectin·spirodiclofen and 15%pyridaben was recommended with control effect of 87.00%.Release of N.californicus can prey on the eggs,nymphs and adults of N.abiesis,with control effect of 55.93%.