Based on the weather data of the November and December 2024, stripe rust in the 2024 wheat growing season is predicted to be in the range of severe epidemic level (40-60% yield loss on susceptible varieties). Using a set of forecast models based on this winter weather data so far (November and December 2024), highly susceptible winter wheat varieties are predicted to have potential yield losses in the range of 27 to 57% with an average of 41% caused by stripe rust in 2025. The predicted severe epidemic level is attributed to the relatively warm weather in these two months. Based on the potential epidemic level, commercially grown varieties are predicted to have 0 to 29% yield losses depending upon the level of resistance or susceptibility of individual varieties. The next forecast will be made in early March based on the entire winter weather data. According to the current forecast, fields grown with moderately susceptible (MS, ratings 6 and 7) or susceptible (S, ratings 8 and 9) winter wheat varieties may need the early fungicide application at the time of herbicide application. Resistant (ratings 1 and 2) and moderately resistant (ratings 3 and 4) spring wheat varieties should be selected to plant, and variety with MS and S ratings (6 – 9) should be avoided. See the tables (Table 1 and Table 2) below for stripe rust ratings of wheat varieties based on the tests in 2024.
Table 1: Stripe rust ratings of winter wheat varieties
| Rating | Soft White | Hard Red | Club | Hard White |
|---|---|---|---|---|
| R (1,2) | aMaze, AP Dynamic, AP Exceed, AP Iliad, AP Olympia, ARS-Selbu 2.0, Bobtail, Inspire, Jameson, Jasper, LCS Biancor, LCS Blackjack, LCS Drive, LCS Hulk, LCS Jefe, LCS Kamiak, LCS Scorpion AX, LCS Shark, LCS Shine, LCS Sonic, Nimbus, Nixon, Norwest Duet, Norwest Tandem, OR2x2 CL+, Resilience CL+, Rollie, Rosalyn, Sockey CL+, Stingray CL+, SY Assure, SY Banks, SY Dayton, SY Ovation, SY Raptor, TMC M-Press, VI Bulldog, VI Frost, VI Presto CL+, WB1529, WB1545, WB1604, WB1621, WB1922, Windust | Allegiant 3412, AP Octane, LCS Evina, LCS Missile, LCS Rocket, LCS Zoom, Norwest 553, SY Clearstone CL2, WB4311, WB4510CLP, WB4623CLP | ARS Castella, Bruehl, Cameo, Cara, Pritchett | LCS Yeti |
| MR (3,4) | ARS Selbu, LCS Artdeco, LCS Ghost, LCS Hydra AX, LCS Reaper AX, Mela CL+, Otto, UI-WSU Huffman, WB1376CLP, WB1720 | Appleby CL+, AP Redeye, AP Venom, Canvas, LCS Helix AX, UI Bronze Jade, Gemini, HSG 108, Kairos, LCS Eclipse AX, Sequoia | Coda | Millie |
| M (5) | GS Bounty, LCS Kraken AX, Mary, Piranha CL+, Puma, Purl, SY107, SY Comman, UI Castle CL+, UI Sparrow, WB1783 | AP503 CL2, Guardian, LCS Aymeric, LCS Blackbir, LCS Helix AX, SY Touchstone | None | None |
| MS (6,7) | AP700 CL, AP Legacy, CPX66251, Curiosity CL+, Devote, Irv, TMC M-Pire, UI Palouse CL+, WB1532 | Canvas, Keldin, LCS Fusion AX, Milestone, Scorpio | ARS Crescent | None |
| S (8,9) | LCS Dagger AX, UI Magic CL+, VI Voodoo CL+ | Battle AX, Brawl CL Plus, CP7010, CP7909, Kivari AX, WB4303, WB4394, WB Rimrock, Whistler, XF4303 | None | None |
Table 2: Stripe rust ratings of spring wheat varieties
| Rating | Soft White | Hard Red | Club | Hard White |
|---|---|---|---|---|
| R (1,2) | Butch CL+, Seahawk, TMC2021, UI Cookiem WB6121, WQL008, WQL195, YSC-605 | Allegiant 6765, Alum, AP Octane, AP Renegade, AP Venom, CP3055, CP3066, CP3099A, CP3119A, CPX39120, Expresso, Glee, Hale, SY Basalt, SY Gunsight, WB7202CLP, WB9636, WB9662 | Hedge CL+, JD, Melba, Roger | Dayn, SY Teton |
| MR (3,4) | Diva, Ryan, Tekoa, TMC Lochaven, UI Stone, SY Saltese, WB6211CLP, YSC-603 | Cabernet, Chet, CP3322, LCS Iron, Net CL+, SY Coho, SY Selway, SY Steelhead, WB9668 | None | UI Platinum |
| M (5) | AP Coachman, Louise, WB6341, Whit | Buck Pronto, Bullseye, Jefferson, LCS Hammer AX | None | None |
| MS (6,7) | AP Mondovi CL2 | CP3915, Hollis, Jefferson HF, LCS Luna, Kelse, WB9303 | None | None |
| S (8,9) | Babe, WB1035 CL+ | Allegiant 6633, CP3530, SY605 CL2, MT Carlson, MT Dutton | None | None |