Seasonal Changes In Distribution Of The African Armyworm, Spodoptera Exempta (Wlk.) (Lep., Noctuidae),

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Date
1968
Authors
BROWN,E. S.
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Abstract
A markedly seasonal occurrence of outbreaks of the African armyworm, Spodoptera exempta (Wlk.), has long been recognized in East Africa, as well as in Rhodesia and South Africa (Hattingh, 1941; Harris, 1944; Whelan, 1954; Brown, 1962). The peak season varies from one area to another, and in each is followed by virtual disappearance of all stages of the insect during the remainder of the year; in many areas such disappearance is remarkably complete (p. 696), although in some of, those climatic conditions appear to remain fully suitable for breeding. The main purpose of this paper is to describe the seasonal changes in distribution of S. exempta in eastern Africa from 1962 to 1967inclusive, and to examine the role of weather in these changes. Seasonal population movements in other parts of Africa are mentioned briefly
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East African Agricultural And Forestry Journal, p. 661-728