This study was carried out to determine distribution, host plant and biology of Ricania simulans (Walker) (Hemiptera: Ricaniidae) in Eastern Black Sea Region of Turkey between 2009 and 2011. There is no important plant pest in the Eastern Black Sea Region of Turkey except this species. However, population of R. simulans being harmful in many wild and cultivated plant species in both nymphal and adult stages has been increased since 2009. As a result of this study, it was determined that R. simulans has been widespread on coastal areas of Eastern Black Sea Region of Turkey with an extensive host range including elderberry, bean, kiwifruit, wild blackberries, hydrangea, fig tree, alder, cherry laurel, tea tree and grapevine. Nymphs of the pest emerge in the middle of May and it has 5 nymphal stages, the adults emerge early July and started to lay their eggs in early August, overwinter as eggs and gives one generation in a year.