Pathogenicity ofVerticillium lecanii to different developmental stages of the silverleaf whitefly,Bemisia argentifolii |
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| Authors: | G Gindin N U Geschtovt B Raccah I Barash |
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| Institution: | (1) Dept. of Nematology, ARO, The Volcani Center, 50250 Bet Dagan, Israel;(2) Dept. of Microbiology, Kazakh Research Institute of Plant Protection, 483117 Almaty, Kazakhstan;(3) Dept. of Virology, ARO, The Volcani Center, 50250 Bet Dagan, Israel;(4) Dept. of Plant Sciences, Tel-Aviv University, 69978 Tel Aviv, Israel |
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| Abstract: | Thirty-five strains ofVerticillium lecanii which originated from different hosts and geographical locations were tested as potential biocontrol agents against silverleaf
whitefly,Bemisia argentifolii Bellows & Perring. All strains were tested for their pathogenicity to third-instar nymphs. Several isolates which exhibited
high pathogenicity to nymphs were also tested against eggs, pupae and adults ofB. argentifolii. Eggs were found to be immune to infection, but mortality of hatching nymphs reached 95–98%. The rate of hatching nymphs’
infection depended on the age at which the eggs were inoculated and the strain’s virulence. Mortality of nymphs recorded on
day 4 after inoculation varied from 0.5±0.3% to 83±2.4%; that of the control ranged from 2.5% to 10.2%. The most virulent
strains, with LT50 ranging between 3.2 and 3.8 days, were isolated from aphids in Israel and probably have a similar origin. The pathogenicity
ofV. lecanii strains to pupae 6 days after inoculation varied between 59± 12.1 % and 72.5± 13.1 %, as compared with natural mortality
of 13.5±4%. The maximum adult mortality caused byV. lecanii strains was between 34.1±5.1% and 52.6±3.8%. |
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| Keywords: | Verticillium lecanii Bemisia argentifolii biocontrol entomopathogenic fungi whitefly |
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