2017 Soybean OVT Foliar Disease Ratings: Maturity Group V FINAL

Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist March 30, 2018 17:01

2017 Soybean OVT Foliar Disease Ratings: Maturity Group V FINAL

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Field evaluations of the Maturity Group V entries in the MSU OVT were conducted at each of the locations where trials were planted (Brooksville (n=2), Clarksdale, Hickory Flat, Longwood, Olive Branch, Raymond, Stoneville (n=3), and Tippo).  Entries were observed for their reaction to the diseases that occurred at each location. Cercospora blight, Septoria brown spot and Target spot were the three most common diseases encountered at each location.  Plots were observed between R6 and R6.5.  Field evaluations for the presence of foliar disease were conducted using a 0 to 9 scale whereby 0=no disease and 9=excessive disease symptoms.  Cercospora leaf blight was evaluated based on the presence of disease on leaves (0 to 5), petioles (6), and on pods and stems (7 to 9) based on disease intensity as assessed by coloration of plant material (leaves with distinct purple coloration and petioles, pods and main stems with purple to near black coloration).  Septoria brown spot and target spot were evlauated in a similar fashion based on the presence of the disease within the plant canopy so that 0 to 3 indicated the presence in the lower canopy, 4 to 5 in the middle canopy, 6 to 8 in the upper canopy, and 9 indicative of extensive defoliation throughout the entire plant canopy and the disease in the upper most canopy.

Note that locations with a non-irrigated trial are marked as location (N) with an “N” in parentheses to indicate non-irrigated.

Maturity Group V Early (n=11 locations):

Cercospora blight (2017 MG V early Cercospora blight ratings)

Septoria brown spot (2017 MG V early Septoria brown spot ratings)

Target spot (2017 MG V early target spot ratings)

Maturity Group V Late (n=11 locations):

Cercospora blight (2017 MG V late Cercospora blight ratings)

Septoria brown spot (2017 MG V late Septoria brown spot ratings)

Target spot (2017 MG V late target spot ratings)

Maturity Group V Conventional (n=2 locations):

Cercospora blight (2017 MG V Conventional Cercospora blight ratings)

Septoria brown spot (2017 MG V Conventional Septoria brown spot ratings)

Target spot (2017 MG V Conventional target spot ratings)

Maturity Group V LibertyLink (n=4 locations):

Cercospora blight (2017 MG V LL Cercospora blight ratings)

Septoria brown spot (2017 MG V LL Septoria brown spot ratings)

Target spot (2017 MG V LL target spot ratings)

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Tom Allen, Extension Plant Pathologist
By Tom Allen, Extension Plant Pathologist March 30, 2018 17:01
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