一般影响
感染过程通常开始于腹部下面未硬化的软角质层。(Unestam, 1973) 真菌菌丝生长在角质层的柔软，未钙化部分。菌丝迅速增长穿过角质层，达到体腔内部，造成欧洲小龙虾在6-10天内死亡。(Unestam 与 Weiss, 1970; Unestam, 1972; Alderman et al.1987) 然而，北美种真菌会在引起强烈防卫反应后，立即渗入角质层。(Unestam 与 Weiss, 1970) 菌丝延伸到水中，并且生产移动游走子，感染其它小龙虾。小龙虾第一个死亡疫情大部分发生在白天 (小龙虾通常是夜行性的)，其中一些可能会出现动作失调，容易背朝上摔倒，无法自行翻身。然而在一般情况下，除非仔细观察水体，当初次发现问题时，通常河流或湖泊已经有大量的死小龙虾。(Alderman et al.1987)" A. astaci已经毁坏欧洲的小龙虾族群引起可观的经济损失到先前有价值的渔场。(Dieguez-Uribeondo et al.1997; 阿朗索 et al.2000; Westman 与 Savolainen, 2001) 已经引进有抵抗性的北美小龙虾品种，以振兴龙虾渔业，但现在的研究表明，这些物种对其余的本地小龙虾种有不利的影响。(Holdich, 1996; Dieguez-Uribeondo et al.1997; Josefsson, 1999, et al.2000) 由于 A. astaci的分布增广，它造成重大风险困扰未受感染的国家与大陆.(CEFAS, Undated)
地点特有的影响：Finland 
经济 /民生: Westman and Savolainen (2001) report that Aphanomyces astaci has devastated Finland's most productive populations of the native noble crayfish, Astacus astacus, causing great losses to once very valuable fisheries and exports. Spain
威胁濒危物种: Aphanomyces astaci impacts a threatened species of crayfish in Spain. Dieguez-Uribeondo et al (1997) studied the attempts to re-establish a threatened species of crayfish in Spain, Austropotamobius pallipes see IUCN Red List of Threatened Species. Two introduced species of crayfish are known to carry the water mould or oomycete, Aphanomyces astaci, in their cuticles and to transmit it to Austropotamobius pallipes Sweden
降低本地生物多样性: In Sweden, Josefsson (1999) states that, "The noble crayfish, Astacus astacus, has nearly been decimated by the introduction of two alien species: the crayfish plague A. astaci and the American signal crayfish, Pacifastacus leniusculus." Turkey
降低本地生物多样性: Rahe and Soylu (1989) report that, "High mortalities were observed in the populations of the Turkish crayfish, Astacus leptodactylus in 1985 and continued to spread over the whole country. By the end of 1987, about 90% of the native crayfish resources were obliterated. Investigations on morphology and ontogenesis of the pathogenic agent revealed the presence of the crayfish plague Aphanomyces astaci (Saprolegniales: Oomycetes)."
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