N. Hinomoto et A. Takafuji, GENETIC CHANGES IN THE POPULATION-STRUCTURE OF THE 2-SPOTTED SPIDER-MITE, TETRANYCHUS-URTICAE KOCH (ACARI, TETRANYCHIDAE), ON VINYL-HOUSE STRAWBERRIES, Applied Entomology and Zoology, 30(4), 1995, pp. 521-528
Two alleles were detected at the phosphoglucoisomerase (PGI) locus of
the two-spotted spider mite, Tetranychus urticae KOCH. For clarifying
the temporal change in genetic structures of the mite population, we i
ntroduced two laboratory-selected strains of the mites which were homo
zygous for PGI alleles onto vinyl-house strawberries. The results reve
aled that mites initially tended to form breeding colonies on individu
al leaflets, but with an increase in their density, they dispersed all
over the plants. As a result, the population became genetically homog
eneous as a whole.