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Some aspects of the biology of the yam moth, Euzopherodes vapidella Mann (Lepidoptera: Pyralidae), a pest of stored yam tubers in Nigeria

2006; Gazi Entomological Research Society; Volume: 30; Issue: 1 Linguagem: Inglês

0974-4576

Joseph Onaolapo Akinneye, M. O. Ashamo,

Insect Resistance and Genetics

Studies on the yam moth, Euzopherodes vapidella Mann (Lepidoptera: Pyralidae) showed that the mean fecundity per female was 79.0±1.7 eggs with an average oviposition period of 2.2 days. The eggs measuring 0.48±0.02 mm in length and 0.28±0.03 mm in width were laid singly, in chains and in batches. The percentage hatchability was 75. The duration of development for the different stages of E. vapidella was 3.5±0.5 days for egg, 14.5±0.8 days for the total larval stage, 1.5±0.8 days for the pre pupa and 7.5±0.5 days for the pupa stage. Total duration of development from egg to adult was 27.0±1.5 days. Unmated females lived longer (6.5 days) than unmated males (5.0 days), mated females (5.0 days) and mated males (3.0 days). The adult females were always bigger than the males. The wing span of the females ranged from 13.8–16.8 mm and in males from 11.0–13.8 mm. The body length for females ranged from 7.0–9.0 mm and was 6.2–7.5 mm for males. Relative humidity of 37% and below did not favour E. vapidella development with no adult emergence while 58% r.h and above favour development of the moth with significant adult emergence.