Symptoms
Initial symptoms of disease appear as small, red-brown spots on leaves measuring 1–2 mm in diameter; as disease progresses, lesions expand and turn lighter in the center; lesions expand to 3–5 mm in diameter and mature lesions have white or gray centers and red-brown margins; high numbers of lesions may form on leaves causing them to turn yellow and drop from the plant
Cause
Fungi
Comments
Disease has worldwide distribution but is most common in peppers grown in the cool-season in tropical and subtropical climates; pathogen also attacks tomatoes
Management
As pepper nursery beds seem to be more susceptible to gray leaf spot infection, control relies on good management of the beds; beds should be well ventilated and all crop debris should be promptly removed; beds should not be planted next to pepper or tomato fields; if disease is present and spreading then application of appropriate fumigant fungicides should be effective at eradicating the pathogen; lesions on plants in an established field usually do not warrant treatment
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