Gs. Miranpuri et Gg. Khachatourians, PATHOGENICITY OF BEAUVERIA-BASSIANA (BALS) VUILL AND VERTICILLIUM-LECANII (ZIMM) TOWARD BLISTER BEETLE, LYTTA-NUTTALI SAY (COL, MELOIDAE), Journal of applied entomology, 118(1), 1994, pp. 103-110
In the Saskatchewan prairies Nuttall blister beetle Lytta nuttali Say
is a sporadic pest of forages, canola, faba beans (Vicia faba) and a v
ariety of other crops like lupin (Lupinus spp.) and vetch (Vicia sativ
a). In this study we examined the effectiveness of various B. bassiana
strains isolated from Russian wheat aphid, Diuraphis noxia (Mordv.) (
DN 8806 and DN 8804); the greenbug, Schizaphis graminum (Rond.) (SG 86
01, SG 8702, SG 8701) and GK 2016, USSR 2553; DAOM 210569, DAOM 144746
; DAOM 71453; ATCC 44860 and Verticillium lecanii ATCC 46578. B. bassi
ana strain SG 8702 proved to be the most effective. Different strains
of B. bassiana used in this study were found more pathogenic to Nuttal
l blister beetle than V. lecanii. Bioassays conducted using conidiospo
res, blastospores or its extracellular fraction with SG 8702 showed ef
fective mortality. The results revealed that possibly fungal toxins ma
y be involved in the early mortality observed with some B. bassiana is
olates.