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Laboratory evaluation of entomopathogenic fungi against larvae and adults of onion maggot (Diptera : Anthomyiidae)

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UNSPECIFIED (2005) Laboratory evaluation of entomopathogenic fungi against larvae and adults of onion maggot (Diptera : Anthomyiidae). JOURNAL OF ECONOMIC ENTOMOLOGY, 98 (6). pp. 1848-1855.

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Abstract

Laboratory experiments were done to measure the susceptibility of larvae and adults of the onion maggot, Delia antiqua (Meigen) (Diptera: Muscidae: Anthomyiidae) to 27 isolates of entomopathogenic fungi from four genera [Beauveria Vuillemin, Lecanicillium (Petch) Zare & W. Gams, Metarhizium Sorokin, and Paecilomyces Bainier]. A novel bioassay was developed for D. antiqua larvae by using a diet based on mixed vegetable powder. When evaluated in a virulence screen, the fungal isolates caused less mortality of D. antiqua larvae than adults. Only three isolates caused > 50% mortality of larvae, whereas 12 isolates caused > 50% mortality of adults. Fungal species was a statistically significant factor affecting the mortality of larvae but not of adults. The fungal isolates causing the most mortality of larvae tended to belong to Metarhizium anisopliae (Metschnikoff) Sorokin. Two M. anisopliae isolates (389.93 and 392.93) were evaluated in dose-response bioassays. The median lethal concentrations of the isolates against larvae were 6.1 X 10(7) conidia ml(-1) for isolate 389.93 and 7.6 X 10(7) conidia ml(-1) for isolate 392.93. The emergence of adult flies from pupae was reduced at high concentrations of conidia (3.0 X 10(8) and 1.0 X 10(8) conidia ml(-1)). The median lethal concentrations of the isolates against adults were 1.7 X 10(7) and 4.0 X 10(7) conidia ml(-1), respectively. Some of the fungal isolates examined may have potential as biological control agents of larvae of D. antiqua and related species.

Item Type: Journal Article
Subjects: Q Science > QL Zoology
Journal or Publication Title: JOURNAL OF ECONOMIC ENTOMOLOGY
Publisher: ENTOMOLOGICAL SOCIETY AMERICA
ISSN: 0022-0493
Official Date: December 2005
Dates:
DateEvent
December 2005UNSPECIFIED
Volume: 98
Number: 6
Number of Pages: 8
Page Range: pp. 1848-1855
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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