Development Of The First Outbreaks Of The African Armyworm, Spodoptera ExemPta

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Date
1981
Authors
PETER O . O
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Abstract
Occurrences of outbreaks of the African armyworm, Spodoptera exempta, between January and December for 19 years (I961 1979), and records on nightly moth catches from light trap stations located between southern Kenya and east-central Tanzania (1~8°S and 35--41°E) for 16 years (1963~1978), have been mapped, tabulated. and analysed an a standard weekly time-table, in order to compare events Occurring between the off-season' months of July to November and the beginning of the 'outbreak seasons' from December or January. Circumstantial evidence from the above, coupled with analysis of dermatological statistics for rainfall, temperature and wind flow over the area and period, support the hypothesis that populations of S. exempta can survive between southern Kenya and east central Tanzania during the off-season months, and contribute to the initial development of 'outbreak seasons' in Tanzania or Kenya, Methods for monitoring and analyzing such developments for improving the efficiency of t~e Army worm Forecasting Service in East Africa are suggested,
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East African Agricultural And Forestry Journal, 1 (4), p. 305-318