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Plantwise Technical Factsheet

powdery mildew of crucifers (Erysiphe cruciferarum)

Host plants / species affected
Brassica carinata (African cabbage)
Brassica juncea
Brassica napus
Brassica napus var. napobrassica (swede)
Brassica oleracea var. capitata (cabbage)
Brassica oleracea var. gemmifera (Brussels sprouts)
Brassica oleracea var. viridis (collards)
Brassica rapa subsp. campestris
Brassica rapa subsp. pekinensis
Eruca vesicaria (purple-vein rocket)
Eschscholzia californica (california poppy)
Eutrema wasabi (Wasabi)
Raphanus raphanistrum (wild radish)
Raphanus sativus (radish)
Description
Mycelium on pods, stems and leaves, amphigenous, forming patches or effuse, subpersistent; hyphal cells 45-75 x (2.5-)5(-10) µm; appressoria unlobed to moderately lobed; conidiophores erect, straight, foot-cells cylindrical, 15-50 x 7-10 µm, followed by (1-)2(-3) shorter or occasionally somewhat longer cells; conidia solitary, cylindrical-doliiform, (25-)30-48(-55) x 12-21 µm, length/width ratio >2. Ascomata (chasmothecia) scattered to gregarious, 85-150 µm diam., peridial cells irregularly polygonal to rounded in outline, 10-25 µm diam., appendages numerous, in the lower half, length variable, 0.5-3.5 times as long as the ascomatal diam., mycelioid, thin-walled, septate, smooth to rough-walled, hyaline, later yellowish to brownish below and paler towards the apex, 4-10 µm wide; asci (3-)4-10(-12), saccate, short-stalked, rarely sessile, (40-)50-85 x 25-45(-50), (2-)3-6(-8)-spored; ascospores (15-)18-24(-30) x 10-14(-16) µm (Braun, 1995).
Related treatment support
 
External factsheets
Aberaeron Allotment Association Fact Files, Aberaeron Allotment Association, English language
Department of Agriculture and Food Western Australia Farmnotes, Government of Western Australia, 2006, English language
PlantVillage disease guide, PlantVillage, English language
PlantVillage disease guide, PlantVillage, English language
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