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Sampling Mononychellus tanajoa (Acari: Tetranychidae) on cassava in Africa

Published online by Cambridge University Press:  10 July 2009

J.S. Yaninek ,
J. Baumgaertner  and
A.P. Gutierrez
J.S. Yaninek*
Affiliation:
IITA Biological Control Program, Cotonou, Republic of Benin
J. Baumgaertner
Affiliation:
Division of Phytomedicine ETH/Z, Zurich, Switzerland
A.P. Gutierrez
Affiliation:
Division of Biological Control, University of California, Berkeley, California 94720, USA
*
Dr J.S. Yaninek, IITA Benin, c/o, L. W. Lambourn & Co Ltd, 26 Dingwall Road, Croydon, CR9 3EE, UK
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Abstract

Density-specific sampling plans were developed under African conditions for the exotic spider mite, Mononychellus tanajoa (Bondar), a serious pest of cassava, Manihot esculenta. The within-plant distribution of Mononychellus tanajoa was found to favour new foliage, regardless of time of planting or plant age. Consequently, the first developed leaf near the top of the foliage was selected as the sampling unit and related to whole plant populations of M. tanajoa. The relationship between the mite population's variance and mean as measured by Taylor's Power Law proved to be stable over a range of planting dates, seasons and locations. Two binomial sampling plans, one based on Taylor's dispersion parameters and another based on direct field observations, were developed and compared. Binomial sampling, appropriate only for densities below 30 mites per leaf, was replaced by an enumerative procedure based on a ‘quick count’ protocol at higher mite densities.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 81 , Issue 2 , June 1991 , pp. 201 - 208
Copyright
Copyright © Cambridge University Press 1991

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