Rearing of potato tuber moth Phthorimaea operculella Zel. (Lepidoptera : Gelechiidae) in the laboratory, biological parameters and the influence of sugar levels in the feeding of adults | Technique d'elevage de la teigne de pomme de terre Phthorimaea operculella Zel. (Lepidoptera : Gelechiidae) en laboratoire, parametres biologiques et influence du taux de sucre dans l'alimentation de l'imago
2000
Badegana, A.M. (Universite de Dschang (Camerooun). Faculte d'Agronomie et des Sciences agricoles) | Ngameni, P.H.
The potato tuber moth Phthorimaea operculella ZeI. was reared in laboratory at temperature of 23 to 27øC, relative humidity of 80 to 90/ and photoperiod of 12 hours, using Gway modified method. The larvae were fed with potato flour mixed with aureomycin, vitamin C and maneb. Adult food was constituted of sugar water solution at different concentrations. Obtained results show that the development cycle lasts 23 to 34 days, egg incubation 4 to 7 days, larval stage 14 to 18 days and the hatching rate reaches 88.4/. Span of the females is greater than that of the males. The average maximum life span of the females is 10.20 days and that of the males 6.46 days. The average maximum laying rate is 208 eggs and corresponds to a sugar rate of 17/. There is a correlation (r = 0,920) between the sugar concentration used to feed the adults and the egg layings. The sugar rate of 17/ is optimum and enables the obtention of maximum laying rate within a short oviposition lapse. This medium can be used in view of further studies on varietal resistance.
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