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Influence of temperature and humidity on the biology of insecticide-resistant and susceptible strains of Tribolium castaneum (Herbst.) (Coleoptera: Tenebrionidae)

Published online by Cambridge University Press:  19 September 2011

J. O. Williams
J. O. Williams
Affiliation:
Nigerian Stored Products Research Institute, P.M.B. 3032, Kano
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Abstract

The influence of temperature and humidity on the biology of insecticide-resistant and susceptible strains of Tribolium castaneum (Herbst) was studied and compared.

At all temperatures (20, 25,30 and 40°C) and r.h. (30, 50,70, 90) tested, the insecticide-resistant strain matured earlier than the susceptible strain. For both strains, the lowest and highest temperature limits for embryonic development and egg hatching were 20 and 40°C, respectively. The incubation period for eggs of both strains averaged 14 days at 20°C and 4 days at 30°C.

Females of the insecticide-resistant strain matured for egg laying earlier (24 hr) than the susceptible strain (60 hr) but laid fewer eggs (36 eggs) than the latter strain (238 eggs). At 30°C and 70% r.h. the resistant strain had a shorter developmental period (15 days) than the susceptible strain (21 days).

Temperature influenced the development of larvae of both strains of T. castaneum. Larvae of the susceptible strain did not develop at 20°C and 30% r.h., 20°C and 90 % r.h. and 40°C and 30%. r.h., whereas larvae of the resistant strains did.

The pupae of both strains developed at all the temperature and relative humidity regimens tested. Temperature and humidity of stored food would therefore, act together to influence the abundance of strains of T. castaneum and the two factors could be manipulated to suppress the population growth of this beetle on stored food.

Résumé

Nous avons etudie et compare' l'influence de la temperature et de l'humidete sur la biologie des souches susceptibles et des souches qui resistant a' l'insecticide. A fortes les temperatures teste'es (20, 25, 30, et 40°C) et a toutes les humidite's relatives (30, 40, 70, 90), nous avons remarque que la souche que resiste a l'insecticide a muri plus fot que la souche susceptible pour les deux souches, les temperatures les plus basses et les plus hantes pour le developpement embryonnaire ebient de l'ordre de 20 et 40°C respectivement. La periode d'incubation ebit en moyenne de 14 jours a 20°C et de 4 jours a 30°C.

Les femelles de la souche qui resiste a l'insecticide ont alfaint l'age de pondre un seuf plus tot (24 hr) que celles de la souche susceptible (60 hr) mais elles ont pondu moins d'oeufs (36 seufs) que les dernieres (238 seufs) a 30°C et 70% r.h. La period de developpement des femelles de la souche qui resiste a l'insecticide (15 jours) etait moins courte que celle des femelles de la souche susceptible (21 jours).

Nous avons renarque l'influence de la temperature sur le developpement des larves des deux souches de T. castaneum. Les larves de la souche susceptibles ne se developpeaient pas a 20°C et 30 % r.h., 20°C et 90% r.h. et 40° C et 30% r.h. alorz que les larves des souches resistantes s'y developpeaient.

Les nymphes des deux souches ont temoigne du developpement al toutes les temperatures et humidites relatives testees. Done, la temperature et l'humidite des vivres enmagasines agissent ensemble pour influer sur l'apondance des souches de T. castaneum, et les deux facteurs penvent etre manipules afin de supprimer la croissance de cet escarbot sur les vivres mis en magasin.

Keywords

Tribolium castaneumfecundityimmature development
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 5 , October 1989 , pp. 607 - 615
Copyright
Copyright © ICIPE 1989

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References

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