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SAMPLING FOR ADULT COCCINELLIDS AND THEIR NUMERICAL RESPONSE TO STRAWBERRY APHIDS (COLEOPTERA:COCCINELLIDAE: HOMOPTERA:APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

B. D. Frazer  and
D. A. Raworth
B. D. Frazer
Affiliation:
Agriculture Canada, Research Station, Vancouver, British Columbia V6T 1X2
D. A. Raworth
Affiliation:
Agriculture Canada, Research Station, Vancouver, British Columbia V6T 1X2
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Abstract

Searching for adult coccinellids in large cages placed over sections of strawberry fields produced an average of 10 times as many coccinellids per metre of row as a relative method of sampling. Methods of converting relative indices to absolute indices of abundance were found. Results suggest that the frequently observed slow increase in abundance of aphid predators in response to increasing aphid abundance may be an artifact resulting from using relative indices of abundance that make no correction for the effects of hunger on predator activity. Calibrating the samples shows that numbers of adult coccinellids follow the trend of aphid abundance closely enough that coccinellid numbers may be predictable.

Résumé

La recherche de coccinelles adultes dans de grandes cages placées dans des champs de fraisiers a montré en moyenne dix fois plus de coccinelles par mètre de rang qu'une méthode relative d'échantillonage. On a trouvé le moyen de transformer les indices d'abondance relative en indices absolu. Les résultats suggèrent que la lente recrudescence observée fréquemment chez les prédateurs de pucerons en réponse à l'accroissement d'abondance des pucerons peut être un artefact dû à l'usage d'indices de la faim sur l'activité des prédateurs. La calibration des échantillons montre que le nombre de coccinelles adultes fluctue avec l'abondance des pucerons suffisament pour que le nombre de coccinelles puissent être prédit.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 2 , February 1985 , pp. 153 - 161
Copyright
Copyright © Entomological Society of Canada 1985

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