basil diseases
Black leg of Basil
Black leg-Dark lesions can be seen on the lower stem of plants resulting in the decline of the plant. The symptoms shown here are from a hydroponic operation.
Figure 1. Black leg of basil. Note dark necrosis of lower stems in hydroponic system. 
Figure 2. Black leg of basil. 
Figure 3. Black leg of basil. Downy mildew of Basil
Downy mildew-The upper leaves may exhibit a chlorosis where infection has occurred. On the underside of the leaf, a gray sporulation may be observed under moist conditions.
Figure 1. Downy mildew of basil. Upper side of leaf. 
Figure 2. Downy mildew of basil underside of leaf showing sporulation. Gray mold of Basil
Gray mold-infection of young seedlings may result in the necrosis of a portion of the plant or death of the entire plant.
Figure 1. Gray mold of basil in hydroponic system. 
Figure 2. Gray mold of basil. 
Figure 3. Gray mold of basil.