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
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.
0 Comments