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首页> 外文期刊>Acta Horticulturae >Semi-field and field evaluation of the role of entomopathogenic nematodes in the biological control of the red palm weevil Rhynchophorus ferrugineus .
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Semi-field and field evaluation of the role of entomopathogenic nematodes in the biological control of the red palm weevil Rhynchophorus ferrugineus .

机译：昆虫致病性线虫在红掌象甲 Rhynchophorus ferrugineus 的生物防治中的作用的半场和场评估。

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摘要

The objective of this study was to explore the efficiency of native isolates of entomopathogenic nematodes (EPNs) of the genera Steinernema and Heterorhabditis in controlling the population of the red palm weevil (RPW), Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae) that attack date palm trees Phoenix dactylifera L. in the Arabic region. Semi-field studies showed that mortality in adults of the RPW infesting caged 5-year-old date palm trees reached 90 and 100% after 10 days of spraying the nematodes Steinernema and Heterorhabditis, respectively on and around the infested date palm trees. Increasing the dose from 2x106 to 4x106 nematode infective juveniles (IJ)/tree did not result in a significant increase in the pest mortality. Field studies indicated that tested EPNs induced highly significant mortality in cocoons of the RPW aggregated in leaf petioles of 10-year-old date palm trees. Mortality in prepupae and pupae inside these cocoons were higher (up to 100%) than that in adult stage (up to 66.6%). The tested heterorhabditid isolates were more effective against RPW cocoons than the steinernematid ones. Regardless of the insect stage, H. bacteriophora induced 98.3% mortality in cocoons, followed by H. indica (90.41%), Steinernema sp. S1 (60.35%), while the least effective nematode was Steinernema sp. S2 (51.17%). These results support the possibility of using EPNs to prevent the emergence of adults from RPW cocoons at the beginning of spring and, in turn suppress the population density of RPW in the surrounding.
机译：这项研究的目的是探索 Steinernema 和 Herorhabditis 的昆虫病原线虫（EPN）天然分离株在控制红掌象鼻虫（RPW）种群中的效率）， Rhynchophorus ferrugineus （Olivier）（ Coleoptera ： Curculionidae ）攻击枣椰树 Phoenix dactylifera L.阿拉伯地区。半田研究表明，在喷洒线虫 Steinernema 和 Herorhabditis 的10天后，感染RPW的笼养5岁枣树的成年死亡率达到90％和100％ >分别在受侵染的枣椰子树上和周围。将线虫感染性幼虫/树的剂量从2x10 6 增加到4x10 6 不会导致虫害死亡率的显着增加。现场研究表明，测试的EPNs在10岁枣椰树的叶柄中聚集的RPW茧中引起了很高的死亡率。这些茧中pre和and的死亡率高于成年期（高达66.6％）（达100％）。所测试的异源生殖分离株对RPW茧的分离比对半胱氨酸分离的分离株更有效。不论昆虫处于何种阶段，H。细菌引起的茧死亡率为98.3％，其次是H。 sp。 S1（60.35％），而最有效的线虫是 Steinernema sp。 S2（51.17％）。这些结果支持了使用EPN来防止春季初RPW茧成虫出现的可能性，进而抑制了周围RPW的种群密度。

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