Exploring the factors involved in the absence of parasitism of Chaetosiphon fragaefolii by generalist parasitoids in strawberry

Chaetosiphon fragaefolii Cockerell (Hemiptera: Aphididae) is a worldwide strawberry pest with scarce records of parasitoids for its control. The parasitization rate of two generalist parasitoids, Aphidius colemani Viereck and Aphidius matricariae Haliday, their behavior and aphid defensive behaviors...

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Bibliographic Details
Published in:	BioControl (Dordrecht, Netherlands) Vol. 65; no. 6; pp. 681 - 692
Main Authors:	Francesena, Natalia, Arneodo, Joel D., Rocca, Margarita, Greco, Nancy M.
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer Netherlands 01-12-2020 Springer Nature B.V
Subjects:	Agriculture Animal Biochemistry Animal Ecology Aphididae Behavioral Sciences Biomedical and Life Sciences Chaetosiphon fragaefolii Crops Defensive behavior Endosymbionts Entomology Females Hemiptera Insects Laboratories Life Sciences Parasitism Parasitoids Plant Pathology Preferences Strawberries Argentina Secondary symbionts Host preference ×
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Summary:	Chaetosiphon fragaefolii Cockerell (Hemiptera: Aphididae) is a worldwide strawberry pest with scarce records of parasitoids for its control. The parasitization rate of two generalist parasitoids, Aphidius colemani Viereck and Aphidius matricariae Haliday, their behavior and aphid defensive behaviors were evaluated with Aphis gossypii Glover (Hemiptera: Aphididae) as a comparative host. Defensive endosymbionts were also surveyed. C . fragaefolii was never parasitized in simple-choice tests, whereas in preference tests both parasitoids chose A. gossypii over C. fragaefolii. No contacts of A. matricariae with C. fragaefolii were observed while A. colemani made more antennal contacts and “stings” on A. gossypii than on C. fragaefolii with the latter exhibiting less defensive behaviors against the parasitoid. The bacterium Acinetobacter sp. was detected in all samples of C. fragaefolii , but with an unknown function. Further research on the possible defensive role of the glandular hairs covering the body of this aphid, the role of chemical signals and the existence of defensive internal mechanisms against parasitoids could provide plausible explanations for the absence of parasitism found.
ISSN:	1386-6141 1573-8248
DOI:	10.1007/s10526-020-10044-9