Diapause in the Maize Stemborer, Busseola Fusca Fuller (Lepidoptera: Noctuidae)

Usua, J. E. (1972)

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Diapuase in the maize stem-borer, Busseola fusca Fuller, can be explained in terms of an underlying genetic mechanism which ensures that a small part of the population goes into diapause in every generation and the major effect of the quality of food on the incidence of diapause. The latter factor is responsible for the conspicuous and easily recognizable peaks of diapause in this insect, especially during the intervening periods between the early and later crops and the late crop of the one year and the early crop of the following year. The quality of food appears to be more important than the genetic factors. Many of the morphological and physiological changes, such as colour, moulting, fat and water content, mitochondrial structure, reduced oxygen consumption, lower water loss, cossation of gametogenesis, reduced feeding, etc., observed in diapausing larvae, provide certain characteristics by which the reduced level of physiological activity characteristic of diapause in insects.