02955naa a2200241 a 450000100080000000500110000800800410001910000190006024500900007926000090016930000110017852022010018965000110239065000120240165000110241365000200242465000100244465000090245465300220246365300170248565300120250277301990251414617772004-10-15       1999    bl uuuu     u00u1 u    #d1 aPANIZZI, A. R.  aHost plant sequences of pentatomid pests of soybean in Northern Parana State, Brazil.  c1999  ap.639.  aDuring the past 20 years we studied the sequences of host plants used by different species of pentatomid pests of soybean in Northern Parana state, Brazil. The southern green stink bug, Nezara viridula (L.) concentrates on soybean plants during the summer and two to three generations are completed on this crop. During fall, adults move to wild hosts; these include star bristle (Acanthospermum hispidum DC.) and castor bean (Ricinus communis L.), upon which they feed but do not reproduce, and the wild legumes [Desmodium tortuosum (Swartz) DC. and Crotalaria spp.] upon which they feed, reproduce, and complete a fourth generation. During late fall and early winter, they complete a fifth generation on radish (Raphanus raphanistrum L.) and mustards (Brassica spp.) During winter, N. viridula may feed, but will not reproduce, on wheat (Triticum aestivum L.). During spring, a sixth generation is completed on siberian motherwort (Leonurus sibiricus L.). A second species, the less polyphagous small green stink bug Piezodorus guildinii (Westwood), also completes two to three generations on soybean during summer. A fourth generation is completed during fall on indigo legumes, Indigofera spp. The bugs remain on these plants during the winter but do not reproduced. A fifth generations is completed on indigo in the spring. A third species, the neotropical brown stink bug Euschistus heros (Fabr.), also will produce two to three generations on soybean during spring-summer. During this time, it may feed, but will not reproduce, on the euphorb Euphorbia heterophylla L. As soybean is harvested by the end of summer, adults eventually will fedd on star bristle, and move to pigeonpea [Cajanus cajan (L.) Millsp.] where they complete a fourth generation, moving later to shelters underneath leave litter where they remain until the next summer. This bug despite completing fewer generations than the former two species, is the most abundant species during the summer. Because its hiding beneath dead leaves allows it to escape detection by parasites and predators during most of the year. The potential use of these host plant sequences to manage stink bug pests of soybean will be discussed.  aBrazil  aInsecta  aInseto  aNezara Viridula  aPraga  aSoja  aNezara viridula L  aPest insects  aSoybean  tIn: WORLD SOYBEAN RESEARCH CONFERENCE, 6., 1999, Chicago. Proceedings: invited and contributed papers and posters. Chicago: University of Illinois / Soybean Research & Development Council, 1999.