Abstract

Neodothiora populina Crous, G.C. Adams & Winton was determined to be a new pathogen of trembling aspen (Populus tremuloides) growing in Alaska, based on completion of Koch’s Postulates in replicated forest and growth chamber inoculation trials. The pathogen is responsible for severe damage and widespread rapid mortality of sapling to mature aspen (≥ 80 years) in the boreal forests of interior Alaska, due to large diffuse annual (1–2 years) cankers. Isolation of the pathogen was challenging, and identification based on cultural characters was difficult. Fruiting bodies were not found on wild diseased trees, but erumpent pycnidia were found in bark overlying cankers on several stems inoculated with pure cultures.

摘要

基于在重复的森林和生长室接种试验中完成的科赫假设，Neodothiora populina Crous, GC Adams & Winton 被确定为生长在阿拉斯加的颤抖白杨 ( Populus tremuloides ) 的一种新病原体。由于大面积的年度（1-2 年）溃疡病，该病原体导致阿拉斯加内陆的北方森林中树苗到成熟白杨（≥ 80 年）的严重损害和广泛快速死亡。病原体的分离具有挑战性，基于文化特征的鉴定也很困难。在野生病树上未发现子实体，但在接种纯培养物的几根茎上覆有溃疡病的树皮中发现了长出分生孢子。