Black Spots On Leaves - Knowledgebase Question

Pasadena, CA
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Question by delcaseg
April 17, 1998
Every year, around springtime, black spots start appearing on the leaves of plants in my yard. The spots are large and uneven covering at least half of the leaf. New growth on the plants also start to curl and die-off; the plants do not die but they never seem to grow either.

Answer from NGA
April 17, 1998
If all of the plants in your yard are affected with black spots, you need to do some serious pruning to open things up to sunshine and better air circulation! Black spots are caused by a fungus that is both airborne and waterborne. Because the spores need free moisture to germinate, they're more of a problem in high rainfall areas than in areas with low rainfall. Try not to sprinkle the leaves of your plants when you water, and make a daily pilgrimage out into the garden to inspect for diseased leaves. Promptly remove any leaves that develop black spots, to keep them from infecting other leaves. Once you've pinched, picked, pruned, and otherwise removed infected plant parts, the problem should diminish.

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