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EFFECTS OF PHOTOPERIOD AND PREY TYPE ON DIAPAUSE TENDENCY AND PREOVIPOSITION PERIOD IN PERILLUS BIOCULATUS (HEMIPTERA: PENTATOMIDAE)

Published online by Cambridge University Press:  31 May 2012

David R. Horton ,
Tonya Hinojosa  and
Stacie R. Olson
David R. Horton
Affiliation:
USDA-ARS, 5230 Konnowac Pass Road, Wapato, Washington, USA 98951
Tonya Hinojosa
Affiliation:
USDA-ARS, 5230 Konnowac Pass Road, Wapato, Washington, USA 98951
Stacie R. Olson
Affiliation:
USDA-ARS, 5230 Konnowac Pass Road, Wapato, Washington, USA 98951
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Abstract

Attempts at using Perillus bioculatus (F.) for control of Colorado potato beetle, Leptinotarsa decemlineata (Say), have been hampered by an incomplete understanding of the predator’s over-wintering biology. This study determined the effects of photoperiod and life stage of prey (Colorado potato beetle) on tendency for adult females to enter reproductive diapause, duration of the preoviposition period, and mortality of females. Perillus bioculatus showed an increasing tendency to enter diapause rather than to initiate reproductive activities as day length decreased. Females that were fed large beetle larvae (mid to late fourth instar) showed a significant increase in the number of individuals entering diapause compared with females that were fed a mix of beetle eggs and small larvae (first to third instar). Probit analysis was used to estimate the photoperiod that caused 50% of females to enter diapause; these estimates were 15L:9D for females feeding on large larvae, and 14.5L:9.5D for females feeding on eggs and small larvae. Females that were fed large larvae also showed a longer preoviposition period and had a slightly significant higher rate of mortality than those fed eggs and small larvae.

Résumé

Le succès des tentatives de lutte contre le Doryphore de la pomme de terre, Leptinotarsa decemlineata (Say), au moyen de Perillus bioculatus (F.) a été entravé par l’insuffisance de nos connaissances sur la biologie du prédateur au cours de l’hiver. Au cours de cette étude, nous avons tenté de déterminer les effets de la photopériode et du stade de développement des proies (doryphores) sur la tendance des femelles adultes du prédateur à entrer en diapause, sur la durée de la période de pré-ponte et sur la mortalité des femelles. Perillus bioculatus manifeste une tendance progressivement plus marquée à entrer en diapause plutôt qu’à entreprendre des activités reproductrices lorsque la longueur des jours diminue. Les femelles nourries de larves de doryphores de grande taille (du milieu à la fin du quatrième stade) ont été beaucoup plus nombreuses à entrer en diapause que celles qui ont été nourries d’un mélange d’oeufs et de petites larves (premier au troisième stade) de doryphores. Une analyse des probits a permis de déterminer à quelle photopériode 50% des femelles entrent en diapause; cette photopériode a été estimée à 15L : 9O pour les femelles nourris de grosses larves de doryphores et à 14,5L : 9,5O pour les femelles nourries d’oeufs et de petites larves. Les femelles nourries de grosses larves avaient également une période de pré-ponte plus longue et un taux de mortalité légèrement mais significativement plus élevé que les femelles nourries d’oeufs et de petites larves.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 130 , Issue 3 , June 1998 , pp. 315 - 320
Copyright
Copyright © Entomological Society of Canada 1998

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