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EFFECTS OF COLLECTION METHOD ON ESTIMATES OF PARASITISM AND SEX RATIO OF FLEA BEETLES (COLEOPTERA: CHRYSOMELIDAE) THAT INFEST RAPE CROPS IN MANITOBA1

Published online by Cambridge University Press:  31 May 2012

H. G. Wylie
H. G. Wylie
Affiliation:
Agriculture Canada, Research Station, Winnipeg, Manitoba R3T 2M9
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Abstract

Similar percentages of parasitized adults and of females of Phyllotreta cruciferae (Goeze) were collected in traps baited with allyl isothiocyanate and in a D-Vac vacuum insect net early in spring and in August–September, when non-reproducing adults predominated. In contrast, a lower percentage of parasitized adults and a higher percentage of females were collected in the traps than in the D-Vac during the beetles’ reproductive period, May–July. A similar difference between the traps and D-Vac was recorded for Phyllotreta striolata (F.) during April–May, when this species begins to reproduce. Therefore, the results indicate that traps used in this study are unsuitable for measuring parasitism and sex ratio of reproducing P. cruciferae and P. striolata.

Résumé

Des proportions semblables d’adultes parasités et de femelles de Phyllotreta cruciferae (Goeze) ont été capturées dans des pièges appâtés d’isothiocyanate d’allyle et dans un filet à succion D-Vac au début du printemps et en août-septembre lorsque les adultes non-reproducteurs prédominent. En revanche, un plus faible pourcentage d’adultes parasités et une plus forte proportion de femelles ont été capturés dans les pièges que dans le filet D-Vac au cours de la période de reproduction des altises qui s’étend de mai à juillet. On remarque une différence analogue entre les pièges et le filet D-Vac pour Phyllotreta striolata (F.) en avril–mai lorsque cette espèce commence à se reproduire. Les résultats révèlent donc que les pièges utilisés dans cette étude ne se prêtent pas à l’évaluation du parasitisme et de la proportion sexuelle des P. cruciferae et P. striolata en reproduction.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 8 , August 1981 , pp. 665 - 671
Copyright
Copyright © Entomological Society of Canada 1981

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