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Rainfall sequences leading to population increases of Austracris guttulosa (Walker) (Orthoptera: Acrididae) in arid north-eastern Australia

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Hunter, D. M. and Elder, R. J. (1999) Rainfall sequences leading to population increases of Austracris guttulosa (Walker) (Orthoptera: Acrididae) in arid north-eastern Australia. Australian Journal of Entomology, 38 (3). pp. 204-218. ISSN 1326-6756

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Article Link: https://doi.org/10.1046/j.1440-6055.1999.00105.x

Abstract

In northern Australia, the spur-throated locust, Austracris guttulosa, has one generation per year with locusts surviving the dry season as immature adults. Adults lay after rain early in the wet season, mainly between October/November and January. On cracking clay soils, a fall of > 40 mm is required to allow oviposition, but to ensure survival of the resulting offspring, there must be follow-up rain of > 40 mm at the oviposition site within 6 weeks. Populations increase during years when more than 50% of the arid zone and Gulf receive both initial and two or more follow-up rains at intervals of ≤ 6 weeks. During the 1970s and 1990s, there were two periods of 3–5 years of such increase, and a large number of swarms resulted.

Item Type:Article
Subjects:Science > Entomology
Plant pests and diseases
Live Archive:05 Mar 2024 03:05
Last Modified:05 Mar 2024 03:05

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