Powdery Mildew on a Lilac Bush

Powdery Mildew on LilacsEnvironment plays a major role in powdery mildew development. The disease occurs during cloudy, humid conditions when days are warm and nights are cool. This usually happens in mid-summer in Nebraska. And, it is happening again this year.

Powdery mildew is the name for the grayish white powdery coating and masses of spores growing on plant leaves, shoots and flowers.

Lilac, zinnia and many other flowers and shrubs can be damaged. Plants infected with powdery mildew usually don't die - but they certainly don't look very attractive. Damage ranges from an unsightly white powdery coating on the foliage to malformation of leaves, destruction of flowers and stunted plant growth.

Powdery mildew is one of the oldest recorded plant diseases. Theophrastis first noted powdery mildew on roses in 300 B.C.


Can You Guess ItThe photo at the right is featured in the July 2004 NEBLINE Newsletter (41 KB Adobe Acrobat printable .pdf file)



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