In-Host Compatibility and In-Host Competition of Exotic and Native Parasitoids of the Tarnished Plant Bug (Heteroptera: Miridae)

  • Lachance S
  • Broadbent A
  • Sears M
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European parasitoids considered for introduction to control the tarnished
plant bug, Lygus lineolaris (Palisot de Beauvois), in North America
have no previous association with pest. In Europe, they attack primarily
Lygus rugulipennis Poppius and L. pratensis (L). Compatibility of
these parasitoids and their hosts in a "new-association," the specificity
of such biocontrol agents. and the potential competition with native
parasitoids are important considerations for use of European species
in biological control programs against L. lineolaris. ln-host compatibility
and competitiveness of the exotic multivoltine parasitoids Peristenus
stygicus Loan and P. digoneutis Loan with the native parasitoids
Leiophron lygivorus (Loan) (multivoltine), P. pallipes (Curtis) and
P. pseudopallipes (Loan) (both univoltine) were assessed, Dissection
of hosts indicated that > 92% of the parasitoid attacks on L. lineolaris
nymphs resulted in oviposition and development of the larvae for
the five species studied. In suitability tests, 84% of P. stygicus
adult wasps emerged front parasitized tarnished plant bugs, compared
with 67 and 69%, for P, digoneutis and L lygivorus, respectively.
No emergence was recorded for P. pallipes, and only 2.9% of adult
P. pseudopallipes emerged, P., digoneutis was superior in the in-host
competition the P. stygicus and L. lygivorus, Peristenus slygicus
was dominant in the in-host competition with the tl:rec North American
parasitoids, The size of the dominant larva inside the host for P.
stygicus 7 d after oviposition decreased as the number of larvae

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  • Simon Lachance

  • A. Bruce Broadbent

  • Mark K. Sears

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