福岡県におけるミカンキイロアザミウマの分布と主要作物およびその周辺植生での発生消長

Abstract

The western flower thrips (WFT), Frankliniella occidentalis, was first discovered in a southern area of Fukuoka Prefecture in April, 1994. Our census surveys revealed that the distribution of WFT has been limited to the southern part and a few restricted areas in Fukuoka Prefecture even one and a half years after its' initial discovery. In strawberry greenhouses, the number of WFT adults captured on blue sticky traps remained low during winter. However, the number increased rapidly in late March and early April. In a rose greenhouse, a similar tendency in the number of WFT was observed. Judging from the abundance pattern in greenhouses and the low temperature conditions outside the greenhouses, the WFT populations overwintering in greenhouses appeared to be a major source of the spring populations. From the control perspective, applications of insecticides immediately after planting and in early spring were thought to be crucial. The number of WFT adults captured in traps placed around a strawberry greenhouse and its surrounding vegetation showed that WFT adults dispersed from the greenhouse during late April and early May, and then colonized the surrounding vegetation. Thus, WFT appeared to utilize greenhouse crops and their surrounding vegetation successively as temporal habitats.