Ecology of peach fruit moth, Carposina niponensis Walsingham. I. Period of adult emergence of the first brood.
In this first paper in a series from Japan on the biology of Carposina niponensis Wlsm., a pest of deciduous fruit trees, the results are presented of investigations since 1961 on the emergence period of first-generation adults at 5 places in Hokkaido. The period of adult emergence varied remarkably, depending on the season and locality. As a rule, first-generation adults emerged in the period from late June to mid-August and second-generation adults from mid-August to early September. A significant correlation existed between the initial date of adult emergence in the first generation and the cumulative maximum temperatures in late May and early June. The emergence of the first generation was well synchronised with the growing stage of the main varieties of apple. Adults of a strain from Ono began to emerge 3-4 weeks later than for strains from Yoichi, Naganuma and Takikawa.