Target Spot

Guy Padgett  |  8/19/2011 11:39:03 PM

Target spot.

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Target Spot (Corynespora cassiicola)
Daniel V. Phillips
University of Georgia

Target spot occurs regularly in low incidence in many areas. The disease usually occurs too late in the season to cause economic damage. However, the disease is potentially serious on late-maturing cultivars or on susceptible cultivars in seasons of high rainfall. Leaf symptoms are seen prior to maturity during periods of high humidity or when free moisture is present.

Lesions on leaves are reddish-brown, circular, and variable in size up to 1/2 inch in diameter. Spots may also be found on petioles, stems, and pods. The larger lesions often show distinct concentric zones of dead tissue and may have a narrow, indistinct yellow-green halo. Lesions which form along veins may be narrow and elongated. Severe infections may cause premature leaf drop.

Most well adapted, high yielding, determinate cultivars have tolerance to target spot.

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