Isolation of heterorhabditid nematodes from palm tree planted areas and their implications in the Red Palm Weevil control†

H. S. Salama, Mahfouz M. Abd-elgawad
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Abstract

Soil samples from 102 sites planted with intercropped palm trees in 8 Egyptian governorates were baited with greater wax moth larvae for the recovery of entomopathogenic nematodes. Only heterorhabditied nematodes were extracted from 5 sites in Alexandria, Behaira, Ismaelia, and Giza governorates. Evaluation of the novel isolates in the laboratory to identify the most efficient ones for biological control of the red palm weevil Rhynchophorus ferrugineus (Oliv.) showed that they are generally more virulent than other entomopathogenic nematode species. However, only two of the 5 strains, isolated from Behaira and Giza, survived a 24 h exposure period in palm weevil-infested tree tissue with a low viability of 19 and 14 %, respectively.

从棕榈树种植区分离异杆线虫及其在红棕榈象甲防治中的意义†
在埃及8个省的102个种植间作棕榈树的地点的土壤样本中,用较大的蜡蛾幼虫引诱,以回收昆虫病原线虫。仅从亚历山大省、贝海拉省、伊斯梅尔利亚省和吉萨省的5个地点提取到异弹状线虫。在实验室中对新分离株的评估,以确定最有效的生物防治红棕象甲Rhynchophorus ferrogineus(Oliv.)的分离株,表明它们通常比其他昆虫病原线虫物种更具毒力。然而,从Behaira和Giza分离的5种菌株中,只有两种在24 在棕榈象甲感染的树组织中暴露h,存活率为19和14 %, 分别地
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