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Halyomorpha halys
Like other true bugs, H. halys feeds by sucking plant juices. Adults generally feed on fruit, whereas nymphs feed on leaves, stems and fruit. The most important crop damage results from insect feeding on pome and stone fruits, and on seeds inside legume pods (e.g. beans and soybean). Hmm, it was sitting very close to my bean plants!
I'm sorry Pam, I can't give you any practical advice. I can't stand killing them, so I just let them stay :(. The species I have is the Brown-winged Stink Bug (Plautia crossota). Last year I saw them in the Poinciana plant (Caesalpinia pulcherrima). But this year, I already noticed a couple of nymphs on the string beans plant.
Thanks Agnes. Yes it was very close to my beans. Those poor beans, what with aphids, stink bugs and those red eggs from the spotting yesterday, they don't stand much chance. Don't want to use poison, can't keep up with squashing the aphids by hand, ash powder deters but doesn't discourage in the long run. Any ideas?