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Wiley, Journal of Applied Entomology, 9(138), p. 677-682, 2014

DOI: 10.1111/jen.12115

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Does host determine short-range flight capacity of trichogrammatids?

This paper is available in a repository.
This paper is available in a repository.

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Abstract

Biological traits, such as body size, fecundity and fertility, of egg parasi- toids are strongly influenced by host species, and the use of a single-host species for consecutive generations has been showed to be detrimental for egg parasitoid biology. Besides biological traits, behaviour of egg parasi- toids is also an important parameter for implying their performance in the field, but information about the effect of host on the behaviour of egg par- asitoids is still scarce. Thus, this work aimed at determining the influence of host species on the short-range flight capacity of three egg parasitoids Trichogrammatoidea annulata De Santis, Trichogramma atopovirilia Oatman and Platner and Trichogramma bruni Nagajara reared on Anagasta kuehniella (Zeller), Corcyra cephalonica (Stainton) and Sitotroga cerealella (Olivier), for first, 10 and 28 consecutive generations. Trichogrammatids emerged inside a tubular dark flight chamber, under controlled conditions, and short-range flying response was based on the proportions of adults trapped to the sticky top of the chamber and the ones found on the bot- tom, which were checked for defective wings. Our data clearly demon- strate that trichogrammatid short-range flight depends on the fasctidious host species. All three egg parasitoids had their flight capacity significantly reduced when emerged from S. cerealella. The highest flying capacity of T. annulata was registered when reared on C. cephalonica, while for T. ato- povirilia was on A. kuehniella and T. bruni on both C. cephalonica and A. ku- ehniella. Parasitoid flight capacity is affected when reared on the same host over generations; however, it was not possible to define a pattern for any of the trichogrammatids. Our findings are of great relevance for quality control of mass-reared egg parasitoids because measuring only behaviour- al traits with use of flight chambers can be more practical and less time- consuming than assessing biological parameters.