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DISTRIBUTION, ABUNDANCE, AND SURVIVAL OF THE BALSAM WOOLLY APHID, ADELGES PICEAE (HOMOPTERA: PHYLLOXERIDAE), ON BRANCHES OF BALSAM FIR, ABIES BALSAMEA1

Published online by Cambridge University Press:  31 May 2012

D. G. Bryant
D. G. Bryant
Affiliation:
Newfoundland Forest Research Centre, Canadian Forestry Service, St. John's
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Abstract

Over 95% of feeding balsam woolly aphids occur in crevices on balsam fir branches and the highest density occurs within the 3-year tip of branches. The crevices occur under the bud scales at nodes, the base of each season’s growth, and among staminate flower buds or among and within flower bracts. The abundance and survival of aphids as well as mortality factors vary with the location of the nodes in a branch, the type of branch, and aphid generation. The significant differences show that there are 9 to 13 strata within the 3-year tip of a branch. For ecological studies and measuring population levels, the cluster of aphids within a defined crevice, for example under the bud scale at the base of a cluster of shoots, can be selected as a sample unit.

Résumé

Le puceron lanigère du sapin, Adelges piceae (Ratz.) un insecte nuisible au sapin baumier, Abies balsamea (L.) Mill., se trouve à 95%, au moins, dans les crevasses des branches, c’est-à-dire sous les écailles de bourgeon à la base de la pousse annuelle et parmi les bourgeons des fleurs staminées, ou parmi et dans les fleurs staminées. L’abondance et la survie des pucerons, outre la mortalité, varient selon l’endroit des crevasses sur la branche, les types des branches, et les generations de printemps et été du puceron. Dans un bout de branche de trois ans, il y a des différences significatives entre le nombre et la mortalité des pucerons et entre les facteurs de mortalité. Par conséquent, on doit faire jusqu’à 13 couches (strates) dans l’extrémité de trois ans d’une branche pour tenir compte de la variation biologique et statistique. Pour les fins d’études écologiques et d’échantillonnage, on peut désigner les pucerons en dedans d’une crevasse spécifique, par exemple sous les écailles à la base des pousses terminales, comme une unité d’échantillonnage.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 10 , October 1976 , pp. 1097 - 1111
Copyright
Copyright © Entomological Society of Canada 1976

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