Abstract
Insect outbreaks can either be caused by a sudden change in the environment of an insect or by changes in the intrinsic genetic or physiological properties of individual organisms in a population (Berryman, 1987). Drought has long been recognized as an important factor in causing outbreaks. Two different situations can be distinguished in the drought-outbreak relationship: one in which outbreaks develop on plants that are being stressed by drought, and one in which outbreaks develop on unstressed plants that have recently been stressed by drought.
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References
Berryman, A.A. (1987). The theory and classification of outbreaks. In: P. Barbosa & J.C. Schultz (eds), Insect Outbreaks, pp. 3–30. San Diego: Academic Press.
Birch, H.F. (1959). Further observations on humus decomposition and nitrification. Pl. Soil 11: 262–286.
Brown, E.S. (1962). The African army worm Spodoptera exempta (Walker) (Lepidoptera, Noctuidae): a review of the literature. London: Commonwealth Institute of Entomology.
Marcovitch, S. (1957). Forecasting armyworm outbreaks - a possibility. J. Econ. Entomol. 50: 112–113.
Mattson, W.J. & R.A. Haack (1987). The role of drought stress in provoking outbreaks of phytophagous insects. In: P. Barbosa & J.C. Schultz (eds), Insect Outbreaks,pp. 365–407. San Diego: Academic Press.
McDonald, G., K.P. Bryceson & R.A. Farrow (1990). The development of the 1983 outbreak of the common armyworm, Mythimna convecta, in Eastern Australia. J. appl. Ecol. 27: 1001–1019.
Pedgley, D.E., W.W. Page, A. Mushi, P. Odiyo, J. Amisi, C.F. Dewhurst, W.R. Dunstan, L.D.C. Fishpool, A.W. Harvey, T. Megenasa & D.J.W. Rose (1989). Onset and spread of an African armyworm upsurge. Ecol. Entomol. 14: 311–333.
Rhoades, D.F. (1985). Offensive-defensive interactions between herbivores and plants: their relevance in herbivore population dynamics and ecological theory. Am. Nat. 125: 205–238.
White, T.C.R. (1984). The abundance of invertebrate herbivores in relation to the availability of nitrogen in stressed food plants. Oecologia 63: 90–105.
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© 1992 Springer Science+Business Media Dordrecht
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Janssen, J. (1992). Why do droughts often result in devastating insect epidemics? The African armyworm, Spodoptera exempta, as an example. In: Menken, S.B.J., Visser, J.H., Harrewijn, P. (eds) Proceedings of the 8th International Symposium on Insect-Plant Relationships. Series Entomologica, vol 49. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1654-1_12
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DOI: https://doi.org/10.1007/978-94-011-1654-1_12
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