Objective:          

Evaluate fungicides for crop tolerance and stripe rust control in winter wheat.

Materials and Methods:

Colter winter wheat was planted with a SeedMaster no-till air-drill on September 30, 2016 along with a fertilizer drill-blend of N-P-K at 0-30-70 lb/A, respectively.  A supplemental fertilizer application of 75-0-40 was broadcast to the winter wheat crop on May 1, 2017. Huskie Complete was applied at 13.7 oz/A on May 9, 2017 to control weeds.  Fungicide treatments were applied at the flag leaf stage on May 31 using a CO2 backpack sprayer equipped with TeeJet XR11002 nozzles in a volume of 20 GPA.   Less than two percent of the crop showed signs of infection at this time.

Results:

All treatments afforded excellent crop tolerance.   Similarly, all treatments provided excellent control of stripe rust.  However, Priaxor plus Tilt afforded the least control of all the treatments evaluated.   Drought and heat stress depressed winter wheat yields, which were about half of the long term average for the area.  As such, there were no yield differences detected among the treatment.  Similarly, there were no treatment effects detected for protein and test weight.

Summary:

All fungicide treatments evaluated provided excellent control of stripe rust.

 

Table 1. Materials and Methods.
Seeding Date: 9/30/2016 Harvest Date: 8/1/2017
Julian Date: 274 Julian Date: 213
Seeding Rate: 125 lb/A Soil Type: Creston SiL
Previous Crop: 100-12-172 Soil Test: 61-46-354
Tillage: Conventional Fertilizer: D:0-30-70 BC: 75-0-40

 

Table 2. Agronomic Data         
  Treatment   Rate    8-Jun 2-Jun 12-Jun 26-Jun 1-Aug 1-Aug 1-Aug
CI SR SR SR YLD PRO TWT
% % % % bu/A % lb/bu
Check   . 0 1.7 3.2 78.3 55.6 10.1 59.3
Nexicor 7 oz/a 0  1.3  0.5  1.7  58  10.7  59.7 
Induce 0.125 % v/v
Nexicor 13 oz/a 0  1.7  0.2  4  55.4  10.7  59.6 
Induce 0.125 % v/v
Quilt Xcel 10.5 oz/a 0  2  0  3.3  56  10.4  59.8 
Induce 0.125 % v/v
Tilt 4 oz/a 0  1.3  0.2  0.7  57.9  10.6  59.8 
Induce 0.125 % v/v
Priaxor + 3 oz/a 0   2   0.5   15   53.2   10.6   59.2  
Tilt 3 oz/a
Induce 0.125 % v/v
Mean   0 1.7 0.8 17.2 56 10.5 59.6
LSD P=.05   . 1.66 1.46 10.12 6.07 0.45 0.53
CV   0 54.77 106.81 32.4 5.95 2.36 0.48
Pr>F   1 0.8898 0.0054 0.0001 0.5364 0.0984 0.0867
CI: Crop injury, SR: Stripe rust, YLD: Yield, PRO: Protein, TWT: Test weight.