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The influence of drought stress on the distribution of insects on four groundnut genotypes grown near Hyderabad, India

Published online by Cambridge University Press:  10 July 2009

A. R. D. Wheatley ,
J. A. Wightman ,
J. H. Williams  and
S. J. Wheatley
A. R. D. Wheatley
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics, Patancheru P. O., Andhra Pradesh 502 324, India
J. A. Wightman
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics, Patancheru P. O., Andhra Pradesh 502 324, India
J. H. Williams
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics, Patancheru P. O., Andhra Pradesh 502 324, India
S. J. Wheatley
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics, Patancheru P. O., Andhra Pradesh 502 324, India
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Abstract

Four groundnut genotypes were grown in a randomized block design across a drought-stress gradient to determine the influence of this factor on insect distribution in the 1985–86 post-rainly season near Hyderabad, in peninsular India. The leaf-miner Aproaerema modicella (Deventer) was most abundant on the most stressed plants. The cicadellid Empoasca kerri Pruthi had the reverse distribution. The thrips Frankliniella schultzei (Trybom) and Scirtothrips dorsalis Hood were at first densest where drought stress was least. Their distribution subsequently became reversed and, as the condition of their hosts worsened, they again became most abundant at the wetter end of the gradient. Bud necrosis disease caused most mortality where drought stress was highest. A subsidiary experiment indicated that the intensity of overhead irrigation did not influence the density of A. modicella. There were marked genotype effects: JL 24 carried the highest density of insects and was most susceptible to bud necrosis disease: NC Ac 343 had the lowest leaf-miner and cicadellid populations. M 13 and ICGS 11 had intermediate characteristics.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 79 , Issue 4 , November 1989 , pp. 567 - 578
Copyright
Copyright © Cambridge University Press 1989

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