Behavioural ecology of the african armyworm, Spodoptera exempta (Walker): Observations on population processes during a high-density outbreak
During sporadic outbreaks of S. exempta, population densities sometimes reach extremely high numbers. Monitoring at one such 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...
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Veröffentlicht in: | Insect science and its application 1981-06, Vol.1 (2), p.143-146 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | During sporadic outbreaks of S. exempta, population densities sometimes reach extremely high numbers. Monitoring at one such 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 one stage of development. Heavy pupal mortality with symptoms of a cytoplasmic virus infection was noted. Flight behaviour of emerging adults revealed observable differences in the flight activity of the moths. Although a great majority of the emerging moths flew away from the area, some stayed back. Eggs layed by the latter produced a second brood but, due to a more or less total depletion of the food source, this subsequent brood did not survive in any appreciable numbers and finally died out. |
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ISSN: | 0191-9040 1742-7584 1742-7592 |
DOI: | 10.1017/S1742758400000308 |