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Within-plant distribution of Mononychellus tanajoa (Bondar) (Acari: Tetranychidae) on cassava: effect of clone and predation on aggregation

Published online by Cambridge University Press:  10 July 2009

A. R. Braun ,
J. M. Guerrero ,
A. C. Bellotti  and
L. T. Wilson
A. R. Braun
Affiliation:
Programa de Yuca, Centro Internacional de Agricultura Tropical, Apartado Aereo 6713, Cali, Colombia
J. M. Guerrero
Affiliation:
Programa de Yuca, Centro Internacional de Agricultura Tropical, Apartado Aereo 6713, Cali, Colombia
A. C. Bellotti
Affiliation:
Programa de Yuca, Centro Internacional de Agricultura Tropical, Apartado Aereo 6713, Cali, Colombia
L. T. Wilson
Affiliation:
Department of Entomology, University of California, Davis, CA 95616, USA
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Abstract

A presence-absence sampling procedure is presented which relates the proportion of leaves infested with the mite Mononychellus tanajoa (Bondar) at a given node of cassava to the mean number of mites per leaf at that node. The procedure incorporates Taylor's variance-mean density relationship, taking into account mite aggregation behaviour. Aggregation of M. tanajoa was greater in plants where mite predators were excluded, on a resistant (CG5-79) rather than a susceptible cassava clone (MCol 22) and on leaves arising from the lower nodes rather than the higher ones. The implications of the effect of mite mortality factors on aggregation are discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 79 , Issue 2 , June 1989 , pp. 235 - 249
Copyright
Copyright © Cambridge University Press 1989

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