ISSN: 1598-3579
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IJIE, vol. 35, no. 1, pp.58-62, January, 2017


Comparative Evaluation of Conidia, Blastospores and Culture Filtrates from Entomopathogenic Fungi against Tetranychus urticae

Hwi-Geong Yun, Dong-Jun Kim, Ji-Hoon Lee, Ji-In Ma, Won-Seok Gwak, Soo-Dong Woo
Chungbuk National University

Abstract: The two-spotted spider mite ( Tetranychus urticae ) has sustained damage on more than 200 host plants worldwide. Many farmers have relied on chemical acaricides to control mite, but the abuse of acaricides has caused serious resistance to mite. To overcome this problem, microbial control using entomopathogenic fungi have been studied. Entomopathogenic fungi have been an important role against the control of pest, and most of their culture products have been demonstrated to have virulence against pest population. In this study, we evaluated and compared the virulence of culture filtrates, aerial conidia and blastospores of selected Metarhizium anisopliae 4-2 and Beauveria bassiana 2R-3-3-1, respectively, among two-spotted spider mite-pathogenic fungi. As a result, the virulence was confirmed in all treatments, and the accumulated mortality rates were between 77 and 100% within 7 days. Especially, treatment with the fungal culture filtrate alone exhibited quite high virulence, and combined treatment with aerial conidia or blastospores enhanced activity. However, the median lethal time of treatments was not significantly different. When two isolates were compared, M. anisopliae 4-2 showed higher virulence than B. bassiana 2R-3-3-1. These results suggest that the selected two fungal isolates and their culture products could be used effectively for the control of two-spotted spider mite

Keyword: Blastospore, Conidia, Culture filtrate, Entomopathogenic fungi, Tetranychus urticae


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