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SPATIAL AND TEMPORAL VARIABILITY IN SEX ATTRACTANT TRAP CATCHES OF EUXOA MESSORIA AND E. OCHROGASTER(LEPIDOPTER: NOCTUIDAE) IN RELATION TO THEIR BIOLOGY IN MANITOBA1

Published online by Cambridge University Press:  31 May 2012

G. L. Ayre ,
W. J. Turnock  and
D. L. Struble
G. L. Ayre
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
W. J. Turnock
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
D. L. Struble
Affiliation:
Research Station, Agriculture Canada, Lethbridge, Alberta T1J 4B1
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Abstract

Tests of intertrap variability in catches of moths of the darksided and redbacked cutworms, Euxoa messoria (Harris) and E. ochrogaster (Guenée), were conducted by placing two traps for each species baited with synthetic sex attractants at 1.6 km (1 mi) intervals to form a grid covering 64 km2 (25 mi2) near Domain, Manitoba. These sex attractants were 93 and 99.6% species specific for E. messoria and E. ochrogaster respectively. Moth catches varied between traps and flights, but the ranking of the traps by catch for each species was consistent during any given flight period. Variability in intertrap catches of E. messoria indicated the moths were not evenly distributed throughout the test area and consequently a sex-attractant trap system with 1.6 km trap spacing is not suitable for monitoring population levels. For E. ochrogaster four traps within an area of 64 km2 would be required to give a population estimate within 20% of the true mean. The flights of E. messoria are not related to degree days and started abruptly and at the same time each year suggesting that development may be synchronized by the summer diapause of the prepupae. The flights of E. ochrogaster were related to degree day accumulations above a threshold temperature of 12.5 °C. Crops had no apparent influence on the distribution of moth catches for either species.

Résumé

Des essais de variabilité des captures (entre les pièges) d'adultes des vers gris moissonneur et à dos rouge, Euxoa messoria (Harris) et E. ochrogaster (Guenée), ont été effectués par l'installation de 2 pièges pour chaque espèce appâtés d'attractifs sexuels synthétiques à 1.6 km (1 mi) d'intervalle de façon à former une grille de 64 km2 (25 mi2) près de Domain au Manitoba. Les attractifs sont spécifiques à 93 et 99.6% pour E. messoria et E. ochrogaster respectivement. Les captures varient selon les pièges et les vols, mais le classement des pièges par capture de chaque espèce est homogène au cours d'une période de vol donnée. La variabilité des captures de E. messoria entre les pièges montre que les adultes ne sont pas uniformément répartis dans la zone d'essai et que par conséquent un système de piégcage aux attractifs sexuels à intervalle de 1.6 km ne se prête pas à l'étude des densités de population. Pour ce qui est de E. ochrogaster, l'installation de 4 pièges dans une zone de 64 km2 serait nécessaire pour donner une estimation s'écartant d'au plus 20% de la moyenne véritable. Les vols de E. messoria n'ont rien à voir avec les degrés-jours et ont débuté brusquement et simultanément, ce qui donne à penser que leur développement pourrait être synchronisé par la diapause estivale des prépupes. Les vols de E. ochrogaster sont reliés à l'accumulation de degrés-jours au-dessus d'une température seuil de 12.5 °C. Les cultures n'ont aucun effet apparent sur la répartition des captures de l'une ou l'autre espèce.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 11 , November 1982 , pp. 993 - 1001
Copyright
Copyright © Entomological Society of Canada 1982

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