Powdery Mildew (Roses)


Mildew (Roses)

Description: Powdery mildew and black spot are the “one-two

punch” on roses. Powdery mildew is a problem in all

parts of the U.S.

Powdery mildew usually first appears on new growth,

in periods of warm, dry days followed by cool, damp

nights. The new leaves may become curled or twisted,

and the shoots will look badly deformed. Often, the

upper surface of the leaves appears normal, but there

is extensive fungus growth on the leaf undersurface.

Solution: Do not

plant roses in shaded spots, especially in areas which

tend to dry out slowly in the morning. Begin spraying

with Shield-All IITM

Organic Fungicide or Soap-Shield® Fungicidal Soap

when weather conditions favor infection, and repeat

every 7-10 days for as long as needed to control disease.

During times of steady or repeated rainfall, control

may not be necessary until the dry months of late summer.

(Soap-Shield may cause copper toxicity on some rose

varieties. Copper toxicity appears as purple spots and

is more likely to occur outdoors than in greenhouses.)


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