Re: CULT: Fungal Leaf Spot


I've heard the names of these two leaf spot diseases used interchangeably. The North Carolina Cooperative Extension service defines the difference between these two types of leaf spot on their web site:

"Leaf spots -- After flowering, leaves may become dotted with small, brown spots. Bacterial leaf spot has a watery, streaked appearance. Water-soaked margins around the spot turn yellow. Fungal leaf spots are rust-colored, drier, and more confined. Since disease organisms overwinter on old foliage, cut and destroy leaves of infected plants in the fall. Spray with a registered fungicide during extended periods of high humidity or rainy seasons."

Can you tell just by looking at the iris which is which or does a lab test have to be done? Will a fungicide work on bacterial leaf spot since it's designed to kill fungal infections and not necessarily bacterial infections?

Janet in Denmark WI
zone 4


----- Original Message ----- From: "Arnold Koekkoek" koekkoek@mtcnet.net

I don't have fungal leaf spot, but I get bacterial leaf spot all the time.
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