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THERMAL CONSTANTS FOR PREIMAGINAL DEVELOPMENT OF THE PARASITOID CEPHALONOMIA STEPHANODERIS BETREM (HYMENOPTERA: BETHYLEDAE)

Published online by Cambridge University Press:  31 May 2012

Francisco Infante
Affiliation:
Centro de Investigaciones Ecológicas del Sureste, Apartado Postal 36, 30700 Tapachula, Chiapas, México
Juan H. Luis
Affiliation:
Centro de Investigaciones Ecológicas del Sureste, Apartado Postal 36, 30700 Tapachula, Chiapas, México
Juan F. Barrera
Affiliation:
Centro de Investigaciones Ecológicas del Sureste, Apartado Postal 36, 30700 Tapachula, Chiapas, México
Jaime Gomez
Affiliation:
Centro de Investigaciones Ecológicas del Sureste, Apartado Postal 36, 30700 Tapachula, Chiapas, México
Alfredo Castillo
Affiliation:
Centro de Investigaciones Ecológicas del Sureste, Apartado Postal 36, 30700 Tapachula, Chiapas, México

Abstract

The relationship between temperature and rate of development is described for Cephalonomia stephanoderis Betrem, an imported ectoparasitoid of the coffee berry borer Hypothenemus hampei (Ferrari).

For all stages, development rate increased linearly with temperature between 17 and 32°C. However, at 37°C both eggs and larvae died. When the parasitoid constructed a cocoon, the lower developmental threshold (t) varied from 11.8°C in the eggs to 14.2°C for pupae; when no cocoon was constructed, it varied from 11.8°C for the eggs to 14.3°C for pupae. The lower developmental threshold, from egg to adult, was 13.7°C (with cocoon) and 13.8°C (without cocoon). As these differences were small in relation to the standard errors of the estimates, they were not considered different. Because C. stephanoderis always constructs a cocoon under field conditions, the threshold temperature of 13.7°C seems to be the most suitable.

Physiological time expressed in degree-days (DD) for the egg to adult cycle of C. stephanoderis is 252.7 ± 45.3 DD (α = 0.05) when a cocoon is constructed, and 242.5 ± 35.1 DD (α = 0.05) when pupation occurs without construction of a cocoon.

Résumé

La relation entre température et la vitesse de développement est décrite pour Cephalonomia stephanoderis Betrem, un ectoparasitoid du scolyte du grain de café Hypothenemus hampei (Ferrari).

Pour touts les stades la vitesse de développement est augmenté linéairement avec température de 17 a 32°C. Pourtant, les larves et les oeufs sont mort à 37°C. Quand le parasite a construit son cocon, la température umbrale de développement (t) a varié entre 11,8°C pour les oeufs et 14,2°C pour les pupes; quand un cocon n’est pas construit, elle varie entre 11,8°C pour les oeufs et 14,3°C pour les pupes. La température umbrale de développement d’oeuf à adulte de 13,7°C (avec cocon) et 13,8°C (sans cocon). Comme ces différences étaient très petites en considérant les erreurs étendard de les estimatives, elles n’était pas considérées significatives. Puisque dans la nature C. stephanoderis construit toujours des cocons, il paraît convenable d’utiliser une température umbrale de 13,7°C.

D’après les résultats obtenus, le temps physiologique exprimé en jour degrée (JD) pour le cicle oeuf à adulte de C. stephanoderis est de 252,7 ± 45,3 JD (α = 0.05) quand un cocon est construit et 242,5 ± 35,1 JD (α = 0.05) quand un cocon n’est pas construit.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1992

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