Efficacy of the entomopathogenic fungus, Metarhizium anisoplae, against Khapra beetle Trogoderma granarium (Coleoptera: Dermestidae) under laboratory conditions

Bionatura Pub Date : 2023-12-15 DOI:10.21931/rb/2023.08.04.59

Battol Qasem Kteo, A. Mohammed, H. H. Al-Saffar

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Abstract

The khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), is an important pest of stored wheat worldwide. This study assessed the efficacy of two isolates of M. anisoplae (commercial and local isolates). Different conidial concentrations (1×108, 1×106, 1×104) conidia/ml-1 and fungal filtrate (100, 75, 50) % of M. anisoplae were evaluated. In both fungal isolates, corrected mortality of T. granarium after exposure varied according to fungal concentrations conidial concentration of conidia/ml-1, and the fungal filtrate at a concentration of 75% caused the highest mortality rates. In addition, mortality rates were significantly varied according to the beetle's developmental stage. Both isolates of M. anisoplae caused between 41 and 67.6 % reduction in total fecundity of the female adults. The results demonstrate no significant differences between the local isolate of M. anisoplae and commercial formulation (Met 52 EC). Further studies under commercial storage conditions are required. Keywords: Insects storage pests, biological control, Entomopathogenic fungi

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昆虫病原真菌 Metarhizium anisoplae 在实验室条件下对卡普拉甲虫 Trogoderma granarium（鞘翅目：皮蠹科）的功效

卡普拉甲虫（Trogoderma granarium Everts，鞘翅目：皮蠹科）是全球储藏小麦的重要害虫。本研究评估了 M. anisoplae 的两种分离物（商业分离物和本地分离物）的效力。对不同的分生孢子浓度（1×108、1×106、1×104）分生孢子/毫升-1 和 M. anisoplae 真菌滤液（100、75、50）%进行了评估。在这两种真菌分离物中，T. granarium 暴露后的校正死亡率随真菌分生孢子浓度（分生孢子数/毫升-1）的不同而变化，浓度为 75% 的真菌滤液造成的死亡率最高。此外，甲虫发育阶段不同，死亡率也明显不同。M. anisoplae 的两种分离物都会导致雌成虫的总繁殖力下降 41% 到 67.6%。结果表明，本地分离的茴芹甲虫与商用制剂（Met 52 EC）之间没有明显差异。需要在商业储存条件下进行进一步研究。关键词贮藏害虫生物防治昆虫病原真菌

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