IACR-Broom's Barn, Higham, Bury St Edmunds, Suffolk, IP28 6NP, UK.
Mol Plant Pathol. 2002 May 1;3(3):119-24. doi: 10.1046/j.1364-3703.2002.00103.x.
Summary Erysiphe betae causes sugar-beet powdery mildew, a serious fungal foliar disease resulting in sugar yield losses of up to 30%. The fungus occurs world-wide in all regions where sugar beet is grown and it also infects other edible beet crops, e.g. beetroots (garden beets). Unlike other powdery mildews, E. betae has so far received relatively little attention from pathologists and the precise mechanisms by which it infects its host remain unclear. Sources of genetic resistance have been identified in cultivated and wild Beta germplasm and molecular markers developed linked to Pm, the only single major R gene described so far, and also to QTL.
Erysiphe betae (Vañha) Weltz.-Kingdom Fungi, Subdivision Ascomycotina, Class Pyrenomycetes, Order Erysiphales, Family Erysiphaceae, Genus Erysiphe.
Superficial persistent mycelium; unbranched erect conidiophores; conidia ripen singly, are hyaline, ovoid, 30-50 microm x 15-20 microm; cleistothecia globose, dark brown/black, 80-120 microm in diameter; mostly 4-8 asci per cleistothecium, mostly 2 or 3 spores per ascus.
A monophagous parasite specific to Beta species. Disease symptoms: Infected foliage and inflorescences bear numerous powdery, white colonies. Under favourable environmental conditions the colonies coalesce, host tissue develops chlorosis and usually senesces early. Cleistothecia develop on heavily infected leaves in late summer and are small black/dark brown globose bodies resting on the mycelial surface.
Chemical control and partial genetic resistance.
贝塔白粉菌引起甜菜白粉病，这是一种严重的真菌叶病，导致甜菜产量损失高达 30%。该真菌在世界范围内所有种植甜菜的地区都有发生，也感染其他可食用的甜菜作物，如甜菜根（花园甜菜）。与其他白粉病不同，贝塔白粉菌迄今为止受到病理学家的关注相对较少，其感染宿主的确切机制仍不清楚。在栽培和野生贝塔种质资源中已经发现了遗传抗性来源，并开发了与 Pm 相关的分子标记，Pm 是迄今为止唯一描述的单一主要 R 基因，也与 QTL 相关。
贝塔白粉菌（Vañha）Weltz.-Kingdom 真菌，子囊菌亚门，子囊菌纲，白粉菌目，白粉菌科，白粉菌属。
表面持久的菌丝体；不分枝的直立分生孢子梗；分生孢子单成熟，无色，卵形，30-50 微米 x 15-20 微米；闭囊壳球形，深棕色/黑色，直径 80-120 微米；每个闭囊壳通常有 4-8 个子囊，每个子囊通常有 2 或 3 个孢子。
一种专性寄生在贝塔属植物上的单食性寄生虫。病害症状：受感染的叶片和花序上有许多粉状、白色的菌落。在有利的环境条件下，菌落融合，宿主组织出现黄化，通常提前衰老。闭囊壳在夏末大量感染的叶片上发育，是黑色/深棕色的球形小体，位于菌丝体表面。
化学防治和部分遗传抗性。
