Albugo candida
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Author(s): E. Cameron, 2008, Landcare Research
Source: PaDIL
Albugo candida (Pers.) Kuntze - (white blister rust)
This is a widespread and important oomycete which causes white rust on crucifers, mainly in temperate regions. Epidemics develop when cool and moist conditions persist. Infected inflorescences are deformed (so called "stagheads") and do not produce viable seeds. Yield losses can reach 50%.
Overwintering oospores germinate and produce 40-60 zoospores which disperse through rain splashes and infect leaves through the stomata. After about 1 week, white pustules or blisters, 1-3 mm large, develop on the underside of leaves, or on stems and flowers, often in concentric circle. These contain and release large masses of sporangia which disperse again with rain splashes or the wind. The time between infection and the formation of sporangia may be as short as 8-10 days. Durable, brown oospores develop inside the stems and survive in plant debris until the next cropping season.
| Vernacular names | |
|---|---|
| • Deutsch: | weisser Rost der Kreuzblütler |
| • English: | white blister rust |
| • Español: | roya blanca de las crucíferas |
| • Français: | rouille blanche des crucifères |
A variety of strains of A. candida have been described which are named after their original host (e.g. Brassica oleracea strain or Raphanus sativus strain) but usually have a broader host range. Management involves the use of resistant cultivars, fungicides and rotation with non-cruciferous crops. The control of cruciferous weeds is also recommended.
Sporangia are approximately spherical, 14-18 µm large with a thin wall. They produce 5-7 zoospores each. Thick-walled oospores are also spherical and 30-55 µm large. The species is homothallic (self fertile).
- Other images of Albugo candida (PaDIL - click to enlarge)
symptoms
sporangia
section through pustule showing sporangiophores and chains of developing sporangia
