Peronospora effusa
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Peronospora effusa (Grev.) Rabenh. 1854 - (downy mildew of spinach)
This oomycete is widely distributed and causes downy mildew in spinach. The symptoms include yellow, irregular and chlorotic lesions on the leaves. The blue-grey sporangia develop under conditions of high humidity. Symptomatic plants are not marketable and asymptomatic infected plants may sporulate during postharvest storage.
The sporangia disperse by wind and rain splashes and can initiate epidemics under suitable environmental conditions. P. effusa is an obligate, heterothallic pathogen with two mating types. If both mating types are present, sexual reproduction occurs, resulting in the formation of oospores. These persist in the soil, in plant debris, or in seeds and can initiate new infections under certain environmental conditions.
Management relies mainly on resistant spinach varieties. Also some cultural methods can reduce the disease inoculum, for example the removal of plant debris or volunteer spinach from infested fields, as well as avoiding planting infecting seeds.
| Vernacular names | |
|---|---|
| • Deutsch: | falscher Mehltau des Spinats |
| • English: | downy mildew of spinach |
| • Español: | mildiú de la espinaca |
| • Français: | mildiou de l'épinard |
Synonyms:
Peronospora farinosa f.sp. spinaciae
For a review see Kandel et al. (2019).
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