Dénes Bartha

1. Introduction The North American black locust (Robinia pseudoacacia L.) is the second-most abundant deciduous tree in forest plantations in the world, and is one of the most important invasive woody species worldwide [1]. This species has spread widely throughout Europe since the 17–18th century, and its intense range expansion is expected to continue eastward, especially in northeastern Europe in the near future [2]. A significant part of European black locust stands is concentrated in Hungary.