Methods Of Prevention and Treatment Of Yellow Leaves The plant should have a good wet-dry cycle which should be regularly monitored with the aid of a humidity meter and kept to a routine.

Water-soaked black and brown spots on plant leaves and stems often indicate a fungal or bacterial disease is the problem. Adjust the watering schedule and do not allow plants to sit in excess water.

BY RICHARD NUNNALLY Special correspondent Feb 17, 2018 Feb 17, 2018 0 1 of 2 ...

During wet and humid weather conditions, irregular light brown spots appear on the leaves from May through August. When these sunken reddish areas develop and grow together, they kill the leaves.

DEAR JANET: The leaves on my rhododendrons on the north side of my home in Northwest Arkansas are turning yellow and have brown spots. Do you have any suggestions to remedy this?

I started my basil plants late this year, on May 10. They didn't grow much at all for the first four weeks, and then started to yellow and develop brown patches. But once the constant rain finally ...