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PostPosted: Sun May 09, 2004 4:34 pm 
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Joined: Wed Apr 28, 2004 7:57 am
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Location: coppell,TEXAS
I have several Indian Hawthorne plants planted in clusters --some but not all of them have small blackish-brownish spots on the leaves? Any ideas what this is and how to treat?

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PostPosted: Mon May 10, 2004 7:57 am 
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Location: Dallas,TEXAS
Sounds like black spot which is a fungal disease. Here's what I got off this website under dirtdoctor.com / information center...

Black Spot
Common name of fungal leaf spot that attacks the foliage of plants such as roses. There is usually a yellow halo around the dark spot, then the entire leaf turns yellow and ultimately die. Best controls include selection of resistant plants and the use of baking soda spray. Severe cases cause leaves to drop. Plant resistant cultivars, and compost all dropped leaves and trimmings. Mulch bare soil to prevent dirt and spores from being splashed up onto plants. Apply horticultural cornmeal to the soil and spray Garrett Juice with potassium bicarbonate.

Cornmeal Juice is a natural fungal control for use in any kind of sprayer. Make by soaking horticultural cornmeal in water at one cup per gallon of water. Put the cornmeal a nylon stocking bag to hold in the larger particles. The milky juice of the cornmeal will permeate the water and this mix should be sprayed without further diluting. Cornmeal Juice can be mixed with compost tea, Garrett Juice or any other natural foliar feeding spray.

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