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SPATIAL AND TEMPORAL VARIABILITY IN SEX ATTRACTANT TRAP CATCHES OF LEUCANIA COMMOIDES AND PERIDROMA SAUCIA (LEPIDOPTERA: 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

Intertrap variability in catches of moths of the cutworms Leucania commoides Guenée and Peridroma saucia (Hübner) was tested by placing two traps for each species baited with artificial sex attractants at 1.6 km (1 mi) intervals to form a grid covering 64 km2 (25 mi2) near Domain, Manitoba. During the flight periods of the test species the attractants were 86.5 and 93.6% species-specific for L. commoides and P. saucia 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 of L. commoides and during the first flight of P. saucia. The low intertrap variability in numbers captured of both species indicated the moths were uniformly distributed in the area. For L. commoides 10 traps within an area of 64 km2 would be required to give a population estimate within 20% of the true mean and for P. saucia three traps would be needed. The flights of L. commoides started abruptly each year and appeared to be triggered by rainfall. Flights of P. saucia did not occur below 10 °C but otherwise weather had no apparent influence on the flights. It was concluded that the moths of this species are blown in from the south each spring. Neither species showed a consistent distributional relationship with crops.

Résumé

On a vérifié la variabilité inter-pièges des captures de papillons nocturnes des vers-gris Leucania commoides (Guenée) et Peridroma saucia (Hübner) en plaçant, pour chaque espèce, 2 pièges appâtés avec un attractif sexuel artificiel à un intervalle de 1.6 km (1 mi) pour former une grille couvrant 64 km2 (25 mi2) près de Domain (Manitoba). Durant les périodes de vol des deux espèces étudiées, les attractifs ont agi spécifiquement sur l'espèce visée dans un rapport de 86.5 et 93.6% pour L. commoides et P. saucia respectivement. Le nombre de papillons capturés variait d'un piège et d'un vol à l'autre, mais l'ordre des pièges par captures pour chaque espèce était constant durant n'importe quel vol de L. commoides et durant le premier vol de P. saucia. La faible variabilité inter-pièges du nombre de captures chez les deux espèces montre que les papillons étaient répartis uniformément dans la région. Pour L. commoides, il faudrait 10 pièges sur une superficie de 64 km2 pour obtenir une estimation de la population dans une marge de 20% de la moyenne vraie et, pour P. saucia, il en faudrait 3. Les vols de L. commoides ont débuté brusquement chaque année et semblaient être provoqués par la pluie. Il n'y avait pas de vols de P. saucia sous 10 °C, mais, à part cela, les conditions du temps n'avaient aucune influence apparente sur les vols. On en a conclu que les papillons de cette espèce étaient amenés par le vent du sud chaque printemps. Aucune des deux espèces ne présentait un rapport de distribution constant avec les cultures.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 12 , December 1983 , pp. 1573 - 1582
Copyright
Copyright © Entomological Society of Canada 1983

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