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Behavioral ecology of the african armyworm spodoptera exempta observations on population processes during a high density outbreak

, : Behavioral ecology of the african armyworm spodoptera exempta observations on population processes during a high density outbreak. Insect Science & its Application 1(2): 143-146

During sporadic outbreaks of S. exempta, population densities sometimes reach extremely high numbers. Monitoring at 1 outbreak revealed that a considerable synchrony exists in the developmental processes of such populations, so that at times up to 97% of the population is represented by only 1 stage of development. Heavy pupal mortality with symptoms of a cytoplasmic virus infection was noted. Flight behavior of emerging adults revealed differences in the flight activity of the moths. Although a majority of the emerging moths flew away from the area, some stayed back. Eggs laid by the latter produced a 2nd brood but, due to depletion of the food source, this brood did not survive in any appreciable numbers and finally died out.


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