Some studies on the life history and oviposition of Carpophilus dimidiatus (F.) (Coleoptera: Nitidulidae) at various temperatures and humidities

Abstract

Studies were carried out on the development and oviposition pattern of Carpophilus dimidiatus (F.) on rolled oats and yeast. Complete development took place between 20 and 32.5°C. Development was fastest at 30°C, 90, 80 or 70% r.h. (23.6–24.7 days); 32.5°C was above optimal, and the species failed to develop at 17.5°C, 70% r.h. The longest mean developmental period of 68.9 days was recorded at 20°C, 70% r.h. Mortality often occurred at the pupal stage and failure to emerge from the pupal skin was frequently the cause of death at lower humidities. Females emerged before males. Optimal temperatures for egg production appeared to be 22.5 and 25°C, and in general more eggs were laid at 70% than at 50% r.h. Fecundity was reduced at 30°C and much reduced at 20°C, 70% r.h.