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Development and reproductive biology of the maize stemborer Busseola fusca Fuller (Lepid., Noctuidae)

Postembryonic development of 5 successive generations of Busseola fusca, reared on sorghum stems in the laboratory was studied during the off‐season. Development was completed without any intervening larval diapause; the mean duration of postembryonic development was 40.8 days. It is concluded that facultative diapause in B. fusca can be prevented if the larvae are fed on young sorghum plants. In the laboratory, eclosion of majority of the pupae, took place between 18.30 and 21.00 h. The moths started mating within a few hours after eclosion, in the same night; mating activity was at its peak between 4.00 and 5.00 h. Male and female moths survived for an average 8.7 and 6.9 days, respectively. Feeding the moths with sucrose, in addition to distilled water, shortened the preoviposition and oviposition periods slightly; but their fecundity was not affected. Fecundity and egg fertility of moths from different sources/seasons (from diapausing larvae, nondiapausing larvae from long‐ and short‐rain sorghum crops and laboratory reared) did not differ significantly. The overall mean fecundity and egg fertility of these moths were 723 and 84%, respectively.