Abstract
The behavior ofMyiopharus doryphorae andM. aberrans, North American tachinid parasitoids of the Colorado potato beetle, was recorded under field and laboratory conditions throughout three growing seasons in western Massachusetts. Eight common behaviors associated with resting, searching, feeding, and larviposition were distinguished, which together accounted for nearly all daytime activity of the females of both tachinids. Several of these behaviors, and in particular larviposition, were closely related to temperature but differed between species. A sequence of five defensive behaviors by the different larval stages of the Colorado potato beetle prevented larviposition in 49% of resisted attempts and perhaps one-fourth of total larviposition attempts byMyiopharus species, yet both parasitoids were highly successful in allocating their progeny during most of the summer. Second- and third-instar beetle larvae were least effective in resisting larviposition. Females of bothMyiopharus species actively guarded recently parasitized hosts from otherMyiopharus females for a period of several minutes after larviposition during the last month of the growing season when second- and third-instar Colorado potato beetle larvae were most scarce. Laboratory studies based on the field observation that femaleM. aberrans doggedly pursued circum-diapausing adult beetles led to the first recorded account ofM. aberrans larvipositing in adult hosts. Flies gained access to a beetle’s vulnerable abdominal dorsum at the instant it lifted its elytra to initiate flight. The late-season switch ofM. aberrans to adult Colorado potato beetles contributed to a seasonal sequence of larviposition-related behaviors concordant with prevailing host densities, which should lend complementarity toM. doryphorae andM. aberrans as biological controls of pest populations.
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López, E.R., Roth, L.C., Ferro, D.N. et al. Behavioral ecology ofMyiopharus doryphorae (riley) andM. aberrans (townsend), tachinid parasitoids of the colorado potato beetle. J Insect Behav 10, 49–78 (1997). https://doi.org/10.1007/BF02765474
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DOI: https://doi.org/10.1007/BF02765474