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DEVELOPMENT OF ADULT AND NYMPHAL POPULATIONS OF LYGUS LINEOLARIS (PALISOT DE BEAUVOIS), L. ELISUS VAN DUZEE, AND L. BOREALIS (KELTON) (HETEROPTERA: MIRIDAE) IN RELATION TO SEEDING DATE AND STAGE OF PLANT DEVELOPMENT ON CANOLA (BRASSICACEAE) IN SOUTHERN MANITOBA1

Published online by Cambridge University Press:  31 May 2012

J.H.M. Leferink  and
G.H. Gerber
J.H.M. Leferink
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
G.H. Gerber
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The development of adult and nymphal populations of Lygus lineolaris (Palisot de Beauvois), L. elisus Van Duzee, and L. borealis (Kelton) was studied in relation to seeding date and stage of plant development in four seedings of canola (cv. Westar) in field plots at Glenlea, Manitoba, in 1988 and 1989. Lygus lineolaris was the dominant species in all seedings and in both years. Colonizing adults (first-generation adults) of the three Lygus spp. first invaded the plots at about the same time from the late rosette to the early flowering stages of plant development, and Lygus adult numbers reached maxima during flowering in all seedings. The stage of plant development, and not seeding date, was important in attracting colonizing adults of Lygus to canola. Second-generation nymphs first appeared at the flowering stage of canola. All nymphal instars reached maxima and median abundances during the late flowering and pod development stages in all seedings. Second-generation adults were present from early to late pod development stages. Median abundances of second-generation adults of L. lineolaris, L. elisus, and L. borealis usually were reached at the same plant growth stage in each seeding.

Résumé

La dynamique des populations d’adultes et de larves de Lygus lineolaris (Palisot de Beauvois), L. elisus Van Duzee et L. borealis (Kelton) a été étudiée en fonction des dates d’ensemencement et des stades de croissance des plants dans quatre semis de colza (cv. Westar), à Glenlea, Manitoba, en 1988 et 1989. Lygus lineolaris a été l’espèce dominante dans tous les semis, au cours des 2 années. Les adultes colonisateurs (première génération d’adultes) des trois espèces de Lygus ont envahi les semis à peu près en même temps, entre le stade rosette et le début de la floraison, et c’est au cours de la floraison que le nombre d’adultes de Lygus a atteint un maximum, dans tous les semis. C’est le stade de croissance de la plante, et non pas la date d’ensemencement, qui est le facteur déterminant de l’arrivée des adultes de Lygus dans les semis de colza. Les larves de la seconde génération sont apparues au cours de la floraison du colza. Tous les stades larvaires ont atteint leur abondance maximale et leur abondance médiane vers la fin de la floraison et durant le développement des siliques, dans tous les semis. Les adultes de la seconde génération ont été présents durant toute la période de développement des siliques. L’abondance médiane des adultes de deuxième génération de L. lineolaris, L. elisus et L. borealis était généralement atteinte au même stade de croissance des plants dans chacun des semis.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 4 , August 1997 , pp. 777 - 787
Copyright
Copyright © Entomological Society of Canada 1997

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