Biological control of the Western flower thripsFrankliniella occidentalis in cucumber using the entomopathogenic fungusMetarhizium anisopliae |
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Authors: | H Azaizeh Galina Gindin O aid I Barash |
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Institution: | (1) The Galilee Society, R&D Regional Center (affiliated with Haifa University), 20200 Shefa Amr, Israel;(2) Inst. of Plant Protection, ARO, The Volcani Center, 50250 Bet Dagan, Israel;(3) Dept. of Plant Sciences, Tel-Aviv University, 69978 Ramat Aviv, Israel |
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Abstract: | Biological control of the western flower thrips (WFT)Frankliniella occidentalis, using the entomopathogenicMetarhizium anisopliae-7 (M. a-7) strain was studied in three consecutive seasons under greenhouse conditions. Cucumber plants infested with WFT were sprayed
with spore suspension of the fungusM. a-7 (0.5 g m-2), or the soil was treated with dry powder of the fungus (0.5 g m-2); the control was without fungus application. In the 1997 spring experiment, when the cucumber plants were initially infested
with only three or four insects per leaf, the spore suspension spray caused a significant reduction in growth of the thrips
population compared with the other treatments and the control. However, in the 1997 summer experiment, when the plants were
initially heavily infested with WFT (10–15 insects per leaf), the spray treatment caused only a modest reduction in WFT population
growth, and only after 4 weeks of treatment was the reduction significant. In the 1999 experiment, with a low initial WFT
population of three or four insects per leaf, the spray treatment was effective in reducing the population growth to a lower
level than in the other treatments or control. TheM. a-7 strain was found to be effective in reducing the population growth of WFT under greenhouse conditions, particularly when
the initial thrips population was low to moderate.
http://www.phytoparasitica.org posting Nov. 4, 2001. |
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Keywords: | Metarhizium anisopliae Frankliniella occidentalis Biocontrol entomopathogenic fungi Pathogenicity bioinsecticid |
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