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REARING DELPHASTUS CATALINAE (COLEOPTERA: COCCINELLIDAE): PRACTICAL EXPERIENCE AND A MODELING ANALYSIS

Published online by Cambridge University Press:  31 May 2012

C.H. Pickett ,
K.A. Casanave ,
S.E. Schoenig  and
K.M. Heinz
C.H. Pickett*
Affiliation:
Biological Control Program, California Department of Food & Agriculture, 3288 Meadowview Road, Sacramento, California, USA 95832
K.A. Casanave
Affiliation:
Biological Control Program, California Department of Food & Agriculture, 3288 Meadowview Road, Sacramento, California, USA 95832
S.E. Schoenig
Affiliation:
Biological Control Program, California Department of Food & Agriculture, 3288 Meadowview Road, Sacramento, California, USA 95832
K.M. Heinz
Affiliation:
Biological Control Program, California Department of Food & Agriculture, 3288 Meadowview Road, Sacramento, California, USA 95832
*
1Author to whom all correspondence should be addressed.
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Abstract

Delphastus catalinae (Horn) (Coleoptera: Coccinellidae) was mass reared to support field studies addressing augmentation and colonization for control of Bemisia argentifolii Bellows and Perring (Homoptera: Aleyrodidae) in southern California. Beetles were reared on B. argentifolii infested poinsettia plants grown inside greenhouses located in northern California. Potted plants, reared from rooted cuttings, were cycled through the rearing system over ca. a 12-week period, then discarded. A total of 174 245 adult beetles were harvested over a 20-week period. Each plant averaged 46 adult beetles (range 21–89) over the same period of time. Harvesting strategies were investigated using a computer simulation model based upon published and hypothesized reproduction and survivorship parameters. Results suggest that removal of approximately 50% of adults per week produced a stable and maximum production of beetles. Actual harvest rates were between 40 and 60% of available beetles. The cost of producing each adult was estimated at US$0.22, with the major cost being labor at 86% of the total.

Résumé

Nous avons procédé à l’élevage en masse de Delphastus catalinae (Coleoptera : Coccinellidae) pour vérifier les données obtenues en nature sur l’augmentation et la colonisation de ces insectes destinés à assurer le contrôle de Bemisia argentifolii, Bellows et Perring (Homoptera; Aleyrodidae) dans le sud de la Californie. Les coccinelles ont été élevées sur des plants de poinsettia infestés de B. argentifolii en serre dans le nord de la Californie. Les plants en pot, cultivés à partir de boutures portant des racines, ont été gardés pendant tout un cycle, soit environ 12 semaines, puis jetés. Au total, 174 245 coléoptères adultes ont été obtenus au cours d’une période de 20 semaines. Chaque plant a donné en moyenne 46 coccinelles adultes (21–89) pendant cette période. Les stratégies de récolte des adultes ont été examinées au moyen d’un modèle de simulation à l’ordinateur basé sur des paramètres de reproduction et de survie hypothétiques ou tirés de la littérature. Les résultats indiquent que la récolte d’environ 50% des adultes chaque semaine assure une production stable et maximale de coccinelles. Les taux réels de récolte ont été de 40% à 60% des coléoptères présents. Le coût de production d’un adulte a été estimé à $0,22, la plus grande partie due à la main d’oeuvre (86% au total).

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 1 , February 1999 , pp. 115 - 129
Copyright
Copyright © Entomological Society of Canada 1999

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