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black stains on basil

Basil    Morocco

Good morning!We have a problem on basil, in which there are appearing many black spots and stains on leaves. It could be Alternaria but I am not sure. What do you think it could be?.

Thank you.


Posted by: Sara (1 point) Sara
Posted: December 19, 2017

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It is very difficult to tell if it is Alternaria or not unless we check for the spores. Generally, there are three kinds of leaf spots on basil caused by Cercospora spp., Alternaria spp., and Colletotrichum spp. But sometimes downy mildew infection may also cause this type of spots.

https://www.daf.qld.gov.au/plants/fru...

http://www.clemson.edu/extension/hgic...


Posted by: Dr. Ravishankar Narayana (134 points) Dr. Ravishankar Narayana
Posted: December 21, 2017

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