Invasive Species Compendium

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Abstract

Occurrence of Phytophthora spp. in deciduous trees in Lithuania: first results.

Abstract

The occurrence of alien invasive species of Phytophthora genus on deciduous trees was surveyed in 17 districts of Lithuania. 261 trees from 14 genus and 22 species with typical to Phytophthora genus disturbance symptoms in city greeneries, parks, and forests were documented. The highest percentage of disturbed trees was observed between Acer (52%) and Alnus (16%), while Tilia was acknowledged as the most resistant deciduous genus in Lithuania. More than a half of documented trees were young individuals (52%). The young trees typically grow nearby the water sources, while the number of premature and mature diseased trees is stable or tend to increase altogether with the distance to water source. The small bleeding spots on stem is the typical disturbance symptom of young trees, while the large bleeding spots and bark cracks are the characteristic symptoms of premature and mature trees (p<0.00).