Answers
It could be a leaf spot disease caused by Colletotrichum sp. The main symptoms are the initial appearance of white colored circular spots, which later coalesced and resulted in necrosis of leaves. In the severe case, it may cause defoliation, tip dieback, stem lesions, and sometimes death of the whole plant.
The pathogen is favored by high humidity. The spores transmit from one plant to another by water splashing.
http://edis.ifas.ufl.edu/pp113
The pathogen is favored by high humidity. The spores transmit from one plant to another by water splashing.
http://edis.ifas.ufl.edu/pp113
Colletotrichum leaf spot symptoms on holy basil (Ocimum tenuiflorum L.)
Colletotrichum on basil (basil black spot): emerging disease under mild to cold and wet climate.
Posted
by: Dr. Ravishankar Narayana
(15 points)
Posted: December 26, 2017
Hi Sara,
Due to the concentric rings pattern of the lesion, the problem definitely seems fungal. I think the pathogen might be Leaf Spot (Cercospora ocimicola). You can find out more about it here on the PlantVillage website.
https://plantvillage.org/topics/basil...
To manage the disease pick off the affected leaves while being careful not to touch any uninfected leaves. Also, water at the base of the plant and be cautious not to have the water splash back up, this will spread the fungus.
Due to the concentric rings pattern of the lesion, the problem definitely seems fungal. I think the pathogen might be Leaf Spot (Cercospora ocimicola). You can find out more about it here on the PlantVillage website.
https://plantvillage.org/topics/basil...
To manage the disease pick off the affected leaves while being careful not to touch any uninfected leaves. Also, water at the base of the plant and be cautious not to have the water splash back up, this will spread the fungus.
Leaf Spot (Cercospora ocimicora) on sweet basil
Posted
by: Kelsee Baranowski
(6 points)
Posted: January 16, 2018
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