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PHENOLOGY AND REPRODUCTIVE STATUS OF ADULT REDBACKED CUTWORMS, EUXOA OCHROGASTER (GUENÉE) (LEPIDOPTERA: NOCTUIDAE), IN SOUTHERN MANITOBA1

Published online by Cambridge University Press:  31 May 2012

G.H. Gerber  and
J. Walkof
G.H. Gerber
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
J. Walkof
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The phenology and reproductive status of adults of the redbacked cutworm, Euxoa ochrogaster (Guenée), were determined from blacklight (BLT) and sex-attractant (SAT) trap catches at four locations in southern Manitoba in 1987 through 1989. The flight period was of 9–12 weeks duration, extending from late June to early October. The first male and female moths were captured at about the same time in the BLT and SAT. The peak catches of the BLT occurred during the first 3 weeks of August (weeks 5 and 6 of the flight period) and those of the SAT about 1 week later. The SAT continued to capture male moths for 2–3 weeks after the last moths appeared in the BLT. Most females captured during the first 2–3 weeks of the flight period were virgins who had not yet initiated egg development. Most mating, egg development, and oviposition took place during a 3- to 4-week period that included the 2 weeks before, the same week as, and the week after the peak BLT catches (weeks 3–7 of the flight period); these activities occurred in the 3–4 weeks before the peak SAT catches. The data suggested that there was competition between SAT and females in attracting males and, consequently, the SAT catch data may not be providing accurate measurements of the sizes of breeding populations of males in the field. The BLT catches underestimated the length of the flight period by about 1.5–3 weeks.

Résumé

Des adultes du Ver-gris à dos rouge, Euxoa ochrogaster (Guenée), ont été capturés au moyen de pièges lumineux (BLT) et de pièges garnis de phéromones sexuelles (SAT) en quatre points du sud du Manitoba de 1987 à 1989; leur phénologie et leur statut reproducteur a été étudié. La période de vol durait 9–12 semaines, soit de la fin de juin au début d’octobre. Les premiers papillons mâles et femelles ont été capturés à peu près en même temps dans les deux types de pièges. Les périodes de capture maximales des pièges BLT ont eu lieu au cours des 3 premières semaines d’août (semaines 5 et 6 de la période de vol), et celles des pièges SAT, environ 1 semaine plus tard. Les pièges SAT ont continué de capturer des papillons mâles pendant environ 2–3 semaines après les dernières captures des pièges BLT. La plupart des femelles capturées au cours des 2–3 premières semaines de la période de vol étaient des femelles vierges chez lesquelles les oeufs n’avaient pas encore commencé à se développer. Les accouplements, le développement des oeufs et la ponte étaient concentrés surtout au cours d’une période de 3–4 semaines recouvrant les 2 semaines précédant l’efficacité maximale des pièges BLT, la semaine de leur efficacité maximale et la semaine suivante (semaines 3–7 de la période de vol); ces activités avaient lieu 3–4 semaines avant la période d’efficacité maximale des pièges SAT. Les données indiquent que les femelles faisaient compétition aux pièges SAT pour attirer les mâles et, conséquemment, les pièges SAT ne permettent pas d’obtenir des mesures exactes des populations de mâles reproducteurs en nature. Les pièges BLT sous-estiment la durée de la période de vol d’environ 1,5–3 semaines.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 3 , June 1992 , pp. 541 - 551
Copyright
Copyright © Entomological Society of Canada 1992

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