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Planting Date and Nitrogen Effects on Fusarium Head Blight and Leaf Spotting Diseases in Spring Wheat

Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Center (ECORC), Central Experimental Farm, K.W. Neatby Bldg., 960 Carling Ave., Ottawa, ON, Canada, K1A 0C6

View larger version (24K): [in this window] [in a new window]   Fig. 1. Daily mean temperature (°C) and relative humidity (RH %) averaged over 10-d intervals from planting to maturity of wheat at the Central Experimental Farm, Ottawa, in 2003, 2004, and 2005.

View larger version (37K): [in this window] [in a new window]   Fig. 2. Effect of planting date on the incidence of leaf-spot in the penultimate leaf (A and C) and flag leaf (B and D) of wheat expressed as leaf area with symptoms (%) in 2003 and 2004 at Site 1; and in 2003, 2004, and 2005 at Site 2. The D1, D2, and D3 are the first, second, and third planting dates, respectively, in each site–year. Bars labeled with different letters within each year–site are significantly different at P 0.05.

View larger version (42K): [in this window] [in a new window]   Fig. 3. Effect of N treatment on the severity of foliar diseases in the penultimate leaf (A and C), and flag leaf (B and D) of wheat expressed as leaf area with symptoms (%) at Site 1 in 2003 and 2004; and at Site 2 in 2003, 2004, and 2005 growing seasons. Bars labeled with different letters within each site–year are significantly different at P 0.05. The N treatments are: N1, 0 kg N ha–1; N2, 60 kg N ha–1 all starter; N3, 100 kg N ha–1 all starter; N4, 60 kg N ha–1 starter + 40 kg N ha–1 top-dress at boot stage; and N5, 60 kg N ha–1 basal + 40 kg N ha–1 foliar spray GS-45.

View larger version (20K): [in this window] [in a new window]   Fig. 4. Effect of planting date on the incidence (%), severity (%), and disease index of Fusarium head blight in 2003 and 2004 at Site 1; and in 2003, 2004, and 2005 at Site 2. The points labeled with different letters within each site–year are significantly different at P 0.05.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Relationships between planting date and incidence of Fusarium head blight in 2003 and 2004 at Site 1; and 2003, 2004, and 2005 at Site 2.