摘要：

The seasonal abundance of the 3 most important pentatomid pests of soyabean were studied weekly in South Carolina between 1977 and 1978 on both cultivated and uncultivated host-plants by using a sweep-net. The sequence of black cherry (Prunus serotina) and elderberry (Sambucus canadensis) in the study area allowed large populations of Acrosternum hilare (Say) to develop before entering soyabean. Populations of A. hilare in soyabean peaked during September and early October. Fourteen other breeding hosts were identified but were considered unimportant. The control of black cherry and elderberry would drastically reduce the importance of A. hilare in soyabean. Populations of Euschistus servus (Say) were sampled during the fruiting cycles of several hosts, including sowthistle (Sonchus oleraceus), wheat, peppergrass (Lepidium virginicum), vetch (Vicia spp.), partridge pea (Cassia fasciculata), wild lettuce (Lactuca canadensis) and horseweed (Erigeron canadensis). The availability of preferred hosts throughout the season may account for the comparatively low populations in soyabean. Important hosts of Nezara viridula (L.) were wild radish (Raphanus raphanistrum) and wheat in spring, and soyabean, cowpea (Vigna unguiculata) and showy crotalaria (Crotalaria spectabilis) during the summer and autumn. Coffee senna (Cassia occidentalis) was highly attractive to adults of both A. hilare and N. viridula. Several hosts of Thyanta accerra McAtee and Euschistus tristigmus (Say) were also identified. Mark-recapture studies showed that adult populations of A. hilare on black cherry and of Euschistus servus on mullein (Verbascum thapsus) frequently move among individual plants.

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