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POPULATION FLUCTUATIONS OF THE RUSTY GRAIN BEETLE, CRYPTOLESTES FERRUGINEUS (COLEOPTERA: CUCUJIDAE), MONITORED WITH INSECT TRAPS IN WHEAT STORED IN A STEEL GRANARY1

Published online by Cambridge University Press:  31 May 2012

S.R. Loschiavo  and
L.B. Smith
S.R. Loschiavo
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
L.B. Smith
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

Population fluctuations of adults of the rusty grain beetle, Cryptolestes ferrugineus (Stephens), in wheat stored in a steel granary were monitored using insect detection traps 35 cm below the surface of the grain during the fall of 1983, and the spring, summer, and fall of 1984. In both years, the peak population occurred from the beginning of September to the third week in October. In 1984, no beetles were found in the traps until early June. The number of beetles in each trap increased slowly until late August (range 0 to 315), and then rapidly until late October (range 91 to 1212), and then decreased rapidly thereafter until mid-November (range 236 to 2). No beetles were caught during the winters after 30 November 1983 and 19 November 1984. The absence of beetles in the traps before June or after November and the small catches before July or in early November were attributed to the combined effects of low population levels and reduced movement of adults at low grain temperatures. A few beetles were caught at a grain temperature of 8°C but none at temperatures lower than 4°C. Approximately 65% of adults found in samples of grain at −7°C in February 1985 were alive and became active in the laboratory. Practical recommendations for monitoring insect pests of stored grain are given, based on the results.

Résumé

Les fluctuations d’abondance des adultes du cucujide roux, Cryptolestes ferrugineus (Stephens) dans du blé stocké dans un grenier d’acier ont été suivies à l’aide de pièges enfouis à 35 cm sous la surface du grain durant l’automne 1983 et le printemps, l’été et l’automne 1984. Les sommets d’abondance ont été observés entre le début septembre et la troisième semaine d’octobre au cours des deux années. En 1984 le cucujide n’a pas été piégé avant le début juin. Le nombre de cucujides par piège a augmenté lentement jusqu’à la fin août (écart de 0 à 315), et rapidement par la suite jusqu’à la fin octobre (écart de 91 à 1212), pour ensuite diminuer rapidement jusqu’à la mi-novembre (écart de 236 à 2). Aucun cucujide n’a été piégé durant l’hiver après les 30 novembre 1983 et 19 novembre 1984. L’absence de captures avant juin et après novembre, et les captures faibles d’avant juillet et de novembre, ont été attribuées aux effets combinés de populations réduites et de l’activité réduite des cucujides à basse température. Quelques cucujides ont été piégés lorsque le blé était à 8°C, mais aucun ne l’a été à moins de 4°C. Environ 65% des adultes trouvés dans des échantillons de grain à −7°C en février 1985 étaient en vie et sont redevenus actifs au laboratoire. On fournit des recommandations pratiques basées sur ces résultats, pour la surveillance des insectes nuisibles du grain stocké.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 7 , July 1986 , pp. 641 - 647
Copyright
Copyright © Entomological Society of Canada 1986

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