期刊
BIOCONTROL SCIENCE AND TECHNOLOGY
卷 21, 期 3, 页码 299-316出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09583157.2010.545871
关键词
Bactrocera invadens; Metarhizium anisopliae; GF-120; IPM; suppression
资金
- German Ministry for Economic Cooperation and Development (BMZ)
Field trials were conducted for two seasons in mango orchards at Nthagaiya, Kenya, to evaluate the efficacy of soil inoculation with Metarhizium anisopliae (Hypocreales: Clavicipitaceae) and GF-120 spinosad bait sprays, applied either alone or in combination, for suppression of the invasive fruit fly, Bactrocera invadens (Diptera: Tephritidae). During the 2006/2007 season, average post-treatment samples showed that B. invadens catches from the control orchards were four times higher than the number of flies captured in the plots receiving M. anisopliae+GF-120. Fruit infestation was 16, 45, 30 and 60% in the M. anisopliae+GF-120, M. anisopliae alone, GF-120 alone and control orchards, respectively. In the 2007/2008 season, average B. invadens post-treatment samples in the control orchards were seven times higher than the treatment with M. anisopliae+GF-120; and fruit infestation was 11, 38, 28, and 52% in the orchards assigned to M. anisopliae+GF-120, M. anisopliae alone, GF-120 alone and control treatments, respectively. Enumeration of conidial densities from soil samples on agar plates showed initial densities of 1.1-2.1 x 10(5) colony forming units (cfu)/g of dry weight of soil but decreased to 1.0-1.4 x 10(3) cfu/g at the end of the experimental period. Exposure of laboratory-reared pupariating larvae to soil samples taken from fungus-treated fields showed significant reduction in B. invadens adult emergence (25-36%) compared with the control (80-82%). Our results suggest that the combined use of soil application of M. anisopliae and GF-120 spinosad bait spray is an effective IPM strategy for field suppression of B. invadens on mango.
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