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SYNCHRONY BETWEEN POPULATIONS OF THE TARNISHED PLANT BUG, LYGUS LINEOLARIS (PALISOT DE BEAUVOIS) (HEMIPTERA: MIRIDAE), AND ITS EGG PARASITOIDS IN SOUTHWESTERN QUEBEC

Published online by Cambridge University Press:  31 May 2012

Khalid M. Al-Ghamdi ,
Robin K. Stewart  and
Guy Boivin
Khalid M. Al-Ghamdi
Affiliation:
Department of Natural Resource Sciences, Macdonald Campus of McGill University, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
Robin K. Stewart
Affiliation:
Department of Natural Resource Sciences, Macdonald Campus of McGill University, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
Guy Boivin
Affiliation:
Agriculture and Agri-Food Canada Research Centre, St-Jean-sur-Richelieu, Quebec, Canada J3B 3E6
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Abstract

The seasonal occurrence of four species of egg parasitoids of the tarnished plant bug (Lygus lineolaris) was determined in three different habitais: fields of mixed weeds. alfalfa (Medicago sativa L.). and crown vetch (Coronilla varia L.) in southwestern Quebec in 1991 and 1992. Parasitoids studied were the mymarids Anaphes iole Girault, Polynema pratensiphagum (Walley), and Erythmelus miridiphagus Dozier and a scelionid, Telenomus sp. Adult populations of these parasitoids showed three or four population peaks in all habitats throughout the season. Adult parasitoid activity started during the first egg-laying period of L. lineolaris at a temperature accumulation of 73 degree-days (DD). The overwintering period began in mid-October at 1277 and 1058 DD for 1991 and 1992, respectively. All the parasitoids had a strong synchrony with L. lineolaris populations; specifically, marked peaks in the adult population of all species were in synchrony with the egg-laying periods of L. lineolaris.

Résumé

La présence saisonnière de quatre espèces de parasitoïdes des oeufs de la punaise terne (Lygus lineolaris) dans le sud-ouest du Québec, fut déterminée pour trois habitats différents : la prairie mélangée, la luzerne (Medicago sativa L.) et la coronille variée (Coronilla varia L.) pour les années 1991 et 1992. Parmi les parasitoïdes étudiés figurent trois espèces de mymarides, soit Anaphes iole Girault, Polynema pratensiphagum (Walley), Erythmelus miridiphagus Dozier, ainsi qu’un scelionide, Telenomus sp. Les parasitoïdes adultes eurent trois à quatre pointes de population au cours de la saison et dans les différents habitats étudiés. L’activité des parasitoïdes adultes débuta pendant la première période de la ponte des oeufs de L. lineolaris lorsque la température cumulative est de 73 degrés-jours (DJ). La période d’hivernement débuta à la mi-October à 1277 et 1058 DJ pour les années 1991 et 1992 respectivement. Tous les parasitoïdes étaient fortement synchronisés avec les populations de L. lineolaris, les plus marquées étaient en synchronisation avec les périodes de ponte de L. lineolaris.

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 4 , August 1995 , pp. 457 - 472
Copyright
Copyright © Entomological Society of Canada 1995

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