controlling or avoiding leafminer damage to plants. oak mildew (source: wikipedia). one of our readers asks, \u201cit looks like white powder was sprinkled all over my pumpkin leaves what could this be?\u201d a common problem among vine vegetables . downy mildew on sunflower leaf in my yard. fig 2 mildews -dmm. basil downy mildew on my 2 potted basil plants. figure 613 – over time, powdery mildew can cover the entire leaf. yank out the lilac with the white fungus? gardening q\u0026a with george weigel | pennlivecom. secondary infection of downy mildew and spray timing. p1140715. mildew. powdery mildew covered shoots. file:uncinula tulasnei – powdery mildew – echter mehltau 07jpg. and hybrids-powdery mildew. green leaves with white splotches. figure 1: symptoms of cucurbit powdery mildew begin as white, powdery spots on the. powdery mildews tend to be severe in warm, dry climates high relative humidity is needed for fungal spores to germinate once they land on leaf surfaces. septoria . max. tomato leaves . controlling powdery mildew. basil downy mildew sporulation (photo courtesy meg mcgrath). downy mildew on basil plants under dark and red light conditions basil plants were maintained under dark conditions (left) and red light (625 nm . fungus on my yellow squash plant leaves. basil downy mildew ja .