Sugar-beet powdery mildew (Erysiphe betae)

Area of Science:

• Plant Pathology
• Mycology
• Agricultural Science

Background:

• Erysiphe betae causes sugar-beet powdery mildew, a significant foliar disease impacting sugar yield by up to 30%.
• This economically important fungus affects sugar beet and other Beta species globally.
• Despite its prevalence, the infection mechanisms of E. betae are not well understood, and it has received limited pathological attention.

Purpose of the Study:

• To summarize current knowledge on Erysiphe betae, the causal agent of sugar-beet powdery mildew.
• To highlight the disease's impact on sugar beet production and host range.
• To review identified sources of genetic resistance and molecular markers for disease management.

Main Methods:

• Taxonomic classification of Erysiphe betae.
• Description of morphological characteristics for identification.
• Overview of host range, disease symptoms, and control strategies.

Main Results:

• Erysiphe betae is a monophagous parasite specific to Beta species.
• Disease symptoms include white, powdery colonies on foliage and inflorescences, leading to chlorosis and early senescence.
• Genetic resistance sources in Beta germplasm have been identified, with molecular markers linked to resistance genes and QTL.

Conclusions:

• Genetic resistance offers a viable strategy for managing sugar-beet powdery mildew.
• Further research into E. betae infection mechanisms is warranted.
• Development of resistant sugar beet varieties is crucial for mitigating yield losses.