Abstract
To develop an augmentative biological control with resident natural enemies in vegetable greenhouses, a common agricultural weed, Commelina benghalensis L. was investigated with respect to the occurrence of predacious natural enemies in Miyazaki City and Kiyotake Town, Miyazaki Prefecture in mid to late November. A total of 9 species in 3 families were collected from 18 sites. In the agricultural lands near the foot of a small mountain, the mean number of natural enemies per site was 18.8±8.04(±SD), and Propylaea japonica (Thunberg) was predominant species, followed by Orius spp. In the agricultural flatlands, the mean number of natural enemies per site was 27.9±35.46, and Orius spp. were predominant, followed by P. japonica (Thunberg). In the agricultural lands and vacant areas near the seaside, the mean number of natural enemies per site was 52.7±41.02, and P. japonica (Thunberg) was predominant, followed by Pilophorus typicus (Distant). The diapause rate of collected Orius spp. was approximately 50% . These results suggested that C. benghalensis L. is a reservoir of these beneficial natural enemies.
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