Plant Diseases/Indian Bean Tree leaves
I have an Indian Bean Tree on which the leaves turn black in the fall instead of the Normal fall colors. I am not sure if it is a disease or a soil problem. Any information is appreciated. Linda
I am not aware of any catalpa diseases in which the leaves turn black. There is a situation called "sooty mold" in which the leaves will blacken. This happens as a result of an insect infestation from insects like aphids, scales, or white flies. To determine if this is sooty mold on your tree, use a wet paper towel and wipe some of these black leaves. If the black rubs off onto the paper towel, then this is probably sooty mold. Using Google, take a look at this problem on other plants such as gardenia or crapemyrtle. Sooty mold is a fungus that grows on the excretement of the insect. You can also collect a few of these leaves and carry them by your local garden center for their opinion.