Life history of Plautia crossata stali SCOTT in the middle part of Mie Prefecture

Abstract

The brown winged green bug, Plautia crossata stali SCOTT, has recently became a serious orchard pest in the western Japan. To clarify its main host plants, number of annual generations and hibernacula, field observations were carried out in the middle part of Mie Prefecture from June, 1976 to April, 1977. Results obtained are summarized as follows:
1) The nymphs feed mainly on fruits of hinoki cypress and japan ceder throughout all the developmental stage.
2) In the locality, this species is bivoltine. Adults of the first generation emerge during the period from middle July to early August, and of the second generation from late August to middle September. The latter disperse from the hinoki cypress from late September to middle October. In this period, a number of adults were observed on the orange and the coral trees. It is suggested that they immigrated from the hinoki cypress to these plants before hibernation.
3) Hibernating adults are found in the crowns of evergreen trees, beneath the fallen leaves and the chips of woods, and in the crevices of dried rotten woods. It is suggested that the adults immigrated into these hibernacula from late September to middle November overwinter at there until middle April to migrate to the hinoki cypress.
4) The developmental zero point and total effective temperature for one generation obtained under laboratory conditions are 13.8°C and 550 day-degrees, respectively.