K. Goka et A. Takafuji, ALLOZYME VARIATIONS AMONG POPULATIONS OF THE 2-SPOTTED SPIDER-MITE, TETRANYCHUS-URTICAE KOCH, IN JAPAN, Applied Entomology and Zoology, 30(4), 1995, pp. 567-579
Genetic variations in two esterases, MDH and PGI were studied among Ja
panese populations of the two-spotted spider mite, Tetranychus urticae
KOCH, through polyacrylamide gel electrophoresis. Esterases and MDH w
ere polymorphic in the majority of populations studied. Geographic pat
terns in esterases and MDH allele frequencies were observed among popu
lations collected from fruit trees and roses. A dendrogram constructed
by the phenetic cluster analysis based on the genetic distance values
showed that these populations could be divided into three geographic
groups. However, there seemed to be no particular geographic pattern i
n any enzyme variation in populations from herbaceous hosts, and the a
llele frequencies differed greatly even among geographically neighbori
ng populations.