HRS Wheat Variety Response to Foliar Fungicide

Greg Endres and Blaine G. Schatz

 


Text Box: A study was conducted at the Carrington Research Extension Center in 2005 to evaluate agronomic performance of selected hard red spring (HRS) wheat varieties with early-flowering application of Folicur. The irrigated trial included ‘Glenn’, ‘Reeder’ and ‘Steele-ND’ planted on 2004 soybean ground (with supplemental wheat straw spread after planting) at 1 and 1.75 million pure live seeds (PLS)/acre (A) on April 28. Folicur at 4 fl oz/A + NIS (Induce) at 0.125% v/v was applied to early-flowering stage (Feekes 10.51) wheat with a hand-boom plot sprayer equipped with 8002 twin-jet nozzles delivering 18 gpa at 40 psi. Flag leaf disease (tan spot and Septoria spp.), leaf rust, and Fusarium head blight (scab) were visually evaluated at the soft-dough stage.

 

Established stands were 1,223,000 and 2,099,000 seedling plants/A with the normal and high seeding rates, respectively (Table 1). However, spikes/A were similar between seeding rates.  Seed yield and quality were similar between seeding rates. Folicur application significantly reduced disease levels though scab index was still 16.1% (Table 2). Also, Folicur reduced DON by 38%, but the result was 6.2 ppm. Compared to the untreated check, Folicur increased yield by 13.3 bu/A and test weight by 2.2 lbs./bu. Scab index with fungicide was 8.2, 14.1, and 25.9% with Glenn, Steele-ND, and Reeder, respectively (Table 3). Leaf disease and leaf rust reduction with fungicide was greatest with Reeder. Fungicide improved yield 10.9 bu/A with Glenn, 11.8 bu/A with Steele-ND, and 17.3 bu/A with Reeder compared to the untreated checks. Fungicide improved test weight 1.3 lbs./bu with Glenn, 1.9 lbs./bu with Steele-ND, and 3.2 lbs./bu with Reeder compared to the untreated checks. n