Downy Mildew is often more widespread in younger plants and is recognised by downy, whitish tufts or spores on the underside of the leaves. Downy mildew is common on grapes, vine crops, cabbages and other crucifers, onions, lettuce and stocks.
Circular, yellow oil spots on younger leaves and white down on the underside of the spots.
Spray with Yates Mancozeb Plus Garden Fungicide. Regular application of the spray is necessary during rainy weather.