|What causes a black type spotting on the leaves which then turn yellow and fall off?|
|Leaf spots are caused by fungi or bacteria. Brown or black spots and patches may be either ragged or circular, with a water soaked or yellow-edged appearance. Insects, rain, dirty garden tools, or even people can help its spread.
To control, remove infected leaves when the plant is dry. Leaves that collect around the base of the plant should be raked up and disposed of. Avoid overhead irrigation if possible; water should be directed at soil level rather than the leaves. For fungal leaf spots, use a general purpose garden fungicide according to label directions.