Potential of Lecanicillium species for dual microbial control of aphids and the cucumber powdery mildew fungus, Sphaerotheca fuliginea |
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Authors: | Jeong Jun Kim Mark S Goettel David R Gillespie |
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Institution: | aLethbridge Research Centre, Agriculture and Agri-Food Canada, P.O. 3000, Lethbridge, AB, Canada T1J 4B1;bApplied Entomology Division, National Institute of Agricultural Science and Technology, Suwon 441-707, Republic of Korea;cPacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, P.O. Box 1000, Agassiz, BC, Canada V0M 1A0 |
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Abstract: | Detached leaf disc bioassays were conducted against cucumber powdery mildew and three species of aphid with three entomopathogenic species of Lecanicillium; Lecanicillium longisporum (Vertalec®), Lecanicillium attenuatum (CS625), and an unidentified isolate (DAOM198499). The three Lecanicillium species had high virulence against the aphids Myzus persicae, Macrosiphum euphorbiae and Aulacorthum solani with the exception of DAOM 198499, which demonstrated reduced virulence to A. solani with an LT50 of 6.4 days. Otherwise, LT50 ranged between two and four days. Suspensions of conidia and blastospores of the Lecanicillium species were also applied onto 15 mm leaf discs dissected from cucumber plants previously inoculated with Sphaerotheca fuliginea. Powdery mildew did not develop when the Lecanicillium applications were made one and eight days after S. fuliginea inoculations. When Lecanicillium was applied to highly infected leaf discs 11 and 15 days after S. fuliginea inoculation, the application suppressed subsequent production of S. fuliginea spores as compared to the controls. These results suggest the potential of a dual role for Lecanicillium spp. as microbial control agents against aphids and powdery mildew. |
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Keywords: | Aphid Aulacorthum solani Entomopathogenic fungi Lecanicillium attenuatum Lecanicillium longisporum Macrosiphum euphorbiae Microbial control Myzus persicae Powdery mildew Simultaneous control Sphaerotheca fuliginea Verticillium lecanii |
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