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Within-plant distribution of thrips and their predators: effects of cotton variety and developmental stage

Published online by Cambridge University Press:  10 July 2009

Ekrem Atakan ,
Moshe Coll  and
David Rosen
Ekrem Atakan
Affiliation:
Department of Entomology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel
Moshe Coll*
Affiliation:
Department of Entomology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel
David Rosen
Affiliation:
Department of Entomology, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel
*
2Department of Entomology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot 76100, Israel.
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Abstract

Plant characteristics often influence the distribution of herbivores and natural enemies. In turn, the degree of their spatial association is likely to influence the ability of natural enemies to control pests. Also, an understanding of pest distribution patterns is important for the development of reliable and cost-effective sampling protocols. In this study, we assessed the effect of cotton variety and developmental stage on the within-plant distribution and degree of spatial overlap between populations of two thrips species and their predators. In the two studied varieties, cv. Pima and Acala, almost all Thrips tabaci Lindeman inhabited the leaves, while Frankliniella occidentalis (Pergande) colonized only the flowers. With respect to the predators, most Chrysoperla carnea (Stephens) were found on the leaves of both varieties, whereas predatory Orius spp. colonized mainly the flowering structures on Pima plants but the leaves on Acala. This variability in prey and predator distribution resulted in a significant and positive correlation between thrips and predator populations on Pima but not on Acala plants. The results also suggest that, overall, thrips are most likely to be preyed upon on squares and to be relatively safe in flowers. An intermediate but relatively high risk of predation apparently occurs on the leaves. The significance of these within-plant distribution patterns for the monitoring of thrips populations is discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 86 , Issue 6 , December 1996 , pp. 641 - 646
Copyright
Copyright © Cambridge University Press 1996

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