PHARATE-ADULT DIAPAUSE OF BARBARA COLFAXIANA (KFT.): DIFFERENTIATION OF 1- AND 2-YEAR DORMANCY

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Abstract
Discovery of diapause in Barbara colfaxiana (Kft.) in the pharate-adult stage of development has allowed establishment of morphological characteristics to distinguish 1-year-diapause individuals from 2-year-diapause individuals at an earlier stage than previously possible. These morphological and some histological criteria are described. On the basis of morphological characteristics alone, 1- and 2-year-diapause individuals can be readily and reliably recognized by the unaided eye. The practical significance as well as the potential contribution of these findings to further research are pointed out.