Phytophthora alder decline: disease symptoms, causal agent and its distribution in the Czech Republic

摘要: Cerný K., Strnadova V. (2010): Phytophthora alder decline: disease symptoms, causal agent and its distribution in the Czech Republic. Plant Protect. Sci., 46: 12–18. decline of riparian populations has recently become an important problem many European countries, including The agent, alni, spread quickly Hundreds kilometres stands, especially western part country, have been severely affected to date. Diseased trees show symptoms characteristic root collar rot; these include small, sparse yellowing foliage, crown dieback, presence exudates on bark necroses tissues. Infected usually die within a few years, or they irreversibly damaged, their function bank reinforcement declines. ecological mechanical functioning stands may be seriously disrupted.