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A STUDY ON THE DISPERSION PATTERN AND FOLIAGE INJURY BY TETRANYCHUS MCDANIELI (ACARINA: TETRANYCHIDAE) IN SIMPLE APPLE ECOSYSTEMS1

Published online by Cambridge University Press:  31 May 2012

L. K. Tanigoshi ,
R. W. Browne  and
S. C. Hoyt
L. K. Tanigoshi
Affiliation:
Tree Fruit Research Center, Washington State University, Wenatchee, Washington
R. W. Browne
Affiliation:
Tree Fruit Research Center, Washington State University, Wenatchee, Washington
S. C. Hoyt
Affiliation:
Tree Fruit Research Center, Washington State University, Wenatchee, Washington
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Abstract

Population growth and dispersion of Tetranychus mcdanieli McGregor were studied in an experiment conducted on Red Delicious apple trees grown in a light and temperature controlled walk-in growth room. Lloyd’s index of mean crowding was calculated as a means of interpreting aggregation patterns; however, it was found that mean colony size was a more generally useful population parameter . The regression of on mean density (m) and the ratio of mean density to were used to determine and characterize the patterns of dispersion obtained under the experimental conditions of the study.

It was shown that the ratio of mean density to is the proportion of sampling units (i.e. individual leaves) that would have a colony size of individuals per unit, all other units being unoccupied. Characterization by the concomitant parameters and provides a more sensitive and meaningful method of describing populations than does the arithmetic mean.

The data indicated that adult female populations of T. mcdanieli tend to be distributed as clumped colonies on apple trees. A plant feeding mite damage scale was devised to evaluate the reliability and accuracy of gross observational estimates as indicators of spider mite levels.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 4 , April 1975 , pp. 439 - 446
Copyright
Copyright © Entomological Society of Canada 1975

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