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PARASITISM OF LEPTINOTARSA DECEMLINEATA (SAY) EGGS BY EDOVUM PUTTLERI GRISSELL (HYMENOPTERA: EULOPHIDAE): EFFECTS OF HOST AGE, PARASITOID AGE, AND TEMPERATURE

Published online by Cambridge University Press:  31 May 2012

J. Lashomb ,
D. Krainacker ,
R.K. Jansson ,
Y.S. Ng  and
R. Chianese
J. Lashomb
Affiliation:
Department of Entomology and Economic Zoology, Cook College, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick, New Jersey, USA08903
D. Krainacker
Affiliation:
Department of Entomology and Economic Zoology, Cook College, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick, New Jersey, USA08903
R.K. Jansson
Affiliation:
Department of Entomology and Economic Zoology, Cook College, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick, New Jersey, USA08903
Y.S. Ng
Affiliation:
Department of Entomology and Economic Zoology, Cook College, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick, New Jersey, USA08903
R. Chianese
Affiliation:
Department of Entomology and Economic Zoology, Cook College, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick, New Jersey, USA08903
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Abstract

Parasitism of the Colorado potato beetle, Leptinotarsa decemlineata (Say), by Edovum puttleri Grissell, an exotic egg parasitoid, was studied in relation to the age of host eggs, the age of adult, female parasitoids, and temperature. Parasitism was greater in eggs ≤2 days old than in eggs older than 2 days. Eggs older than 2 days were killed primarily by probing and consequent desiccation. The percentage of eggs killed by probing was positively correlated with host age and negatively correlated with percentage parasitism. Total mortality of eggs from parasitism and probing did not differ among age classes. Following a 3-day preoviposition period, parasitism and probing increased with an increase in the age of females, peaked when adults were ca. 13 days old, and subsequently declined. Parasitism and probing were influenced by temperature: at 15 °C, no parasitism or probing was observed; above 15 °C, mortality from parasitism and probing increased with an increase in temperature up to 30 °C; above 30 °C, the number of eggs that were parasitized and probed decreased with an increase in temperature.

Résumé

On a étudié le parasitisme du doryphore de la pomme de terre, Leptinotarsa decemlineata (Say) par Edovum puttleri Grissel, un parasitoïde d’oeufs exotique, en relation avec l’âge des oeufs de l’hôte, l’âge des femelles adultes du parasitoïde et la température. Le parasitisme s’est avéré plus élevé chez les oeufs de moins de 2 jours que chez ceux de plus de 2 jours. Les oeufs de plus de 2 jours sont morts principalement par dessication causée par le sondage du parasitoïde avec l’ovipositeur. Le pourcentage des oeufs tués par sondage était corrélé positivement avec l’âge de l’hôte et négativement avec l’incidence du parasitisme. La mortalité totale par parasitisme et par sondage ne différait pas entre classes d’âge. A la suite d’une période de préoviposition de 3 jours, le parasitisme et le sondage ont augmenté avec une augmentation de l’âge des femelles, atteint un pic lorsque les adultes avaient environ 13 jours, pour ensuite décroître. Le parasitisme et le sondage ont été affectés par la température : à 15 °C on n’a pas observé de parasitisme ou de sondage; au-dessus de 15 °C, la mortalité due au parasitisme et au sondage a augmenté avec la température jusqu’à 30 °C; au-dessus de 30 °C, le nombre d’oeufs parasités et sondés a diminué avec un accroissement de la température.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 1 , January 1987 , pp. 75 - 82
Copyright
Copyright © Entomological Society of Canada 1987

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