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Pathogenicity and Virulence of Purpureocillium lilacinum (Hypocreales: Ophiocordycipitaceae) on Mexican Fruit Fly Adults

Author:
Toledo-Hernández, Ricardo A., Toledo, Jorge, Valle-Mora, Javier, Holguín-Meléndez, Francisco, Liedo, Pablo, Huerta-Palacios, Graciela
Source:
TheFlorida entomologist 2019 v.102 no.2 pp. 309-314
ISSN:
1938-5102
Subject:
Anastrepha ludens, Nematoda, Purpureocillium lilacinum, adults, conidia, eggs, fecundity, fungi, hatching, insects, lethal concentration 50, longevity, mortality, pathogens, sublethal effects, virulence
Abstract:
Purpureocillium lilacinum (Thom) Luangsa-ard, Houbraken, Hywel-Jones & Samson (Hypocreales: Ophiocordycipitaceae) is a fungus commonly used for controlling nematodes, and also has been reported as an insect pathogen. However, little is known about its effects on insects. Here, the pathogenicity of 9 isolates and the virulence and sublethal effects of 2 isolates were evaluated to control adult Anastrepha ludens (Loew) (Diptera: Tephritidae). The pathogenicity assays demonstrated that the 9 isolates were pathogenic, with mortality percentages ranging from 28.8 to 52.4% and LT₅₀ values were 18 d or more. The strain CFFSUR-A53 was more virulent than CFFSUR-A60, with LC50 values of 7.62 × 10⁶ and 5.2 × 10⁹ conidia per mL, respectively. The isolates reduced the life expectancy of the flies by 65 and 37%, decreased fecundity by 78 and 36%, and reduced egg hatching by 31.4 and 18.5%, respectively.
Agid:
6470773