Efficacy of native entomopathogenic nematodes against different white grubs in sweetpotato field in China

文献类型： 外文期刊

第一作者： Ma, Juan

作者： Ma, Juan;Wang, Rongyan;Gao, Bo;Li, Xiuhua;Chen, Shulong

作者机构：

关键词： Entomopathogenic nematode; Holotrichia parallela; Anomala corpulenta; H. oblita; Biological control

期刊名称：CROP PROTECTION （ 影响因子：2.5； 五年影响因子：2.8 ）

ISSN： 0261-2194

年卷期： 2024 年 184 卷

页码：

收录情况： SCI

摘要： White grubs ( Holotrichia parallela, , Anomala corpulenta and Holotrichia oblita) ) are the main underground pests of sweetpotato in North China. The virulence of 26 entomopathogenic nematode (EPN) isolates belonging to 10 species against H. parallela, , A. corpulenta and H. oblita was evaluated in the laboratory. Isolates showing greater efficacy were further tested at different concentrations, and their virulence against different developmental stages of different white grub species was also examined. Greenhouse and field experiments were conducted to identify the most effective and adaptable nematode isolates. The mortality of the white grubs was significantly affected by nematode isolates and concentrations. The tested Heterorhabditis beicherriana NCWZ1, H. bacteriophora HQ4 and H. beicherriana LJ24 caused more than 70% mortality of the insect larvae at an application rate of 60 infective juveniles (IJs)/cm2 2 in the laboratory. In general, the susceptibility of the first and second instar of the white grubs was overall higher than that of the third instar according to the bioassay. Holotrichia oblita were less susceptible to most of the EPNs than H. parallela and A. corpulenta. . There were significant differences in susceptibility to the nematodes among the early stage and the late stage of the first instar larvae of H. oblita. . The tested EPN species showed promising control efficacy in field experiments. Heterorhabditis beicherriana NCWZ1 provide the highest efficacy at an application rate of 2 x 109 9 IJs/ha in the second and third field experiments. Our findings indicate that native EPN have good potential for use in the integrated management of white grubs in China.

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