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Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND

Leaf Rust Detection in ND Wheat Surveys, 1999-2006. Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND. Importance of Surveys. ND #1 in spring wheat and durum production Diseases = severe economic damage

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Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND

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  1. Leaf Rust Detection in ND Wheat Surveys, 1999-2006 Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND

  2. Importance of Surveys • ND #1 in spring wheat and durum production • Diseases = severe economic damage • Producers need “real time” information to make informed management decisions • Survey data provides such information • + helps validate disease forecasting models • + provides information about crop losses/quality; possible shifts in races

  3. Real Time Information Provided • Ag Alerts for Growers • Weekly Crop and Pest Report • IPM Web Site

  4. ND Wheat Surveys Collaborative Effort: NDSU Extension Area Specialists and 2 NDSU Extension State Specialists • Terry Gregoire • Devils Lake Area Denise Markel NCREC • Marcia McMullen • Jan Knodel • SE area *Roger Ashley DREC • Greg Endres • CREC Funded by ND Wheat Commission, ND Dept. of Ag., APHIS –ARS Cooperative Pest Survey

  5. 1. Field Scouts trained in pest ID & scouting methods The Wheat Survey Uses Technology to Improve Information Delivery 2. Record field data using iPAQs and GPS 3. Field records go from Excel database to mapping program. Interpolated Grid map Bulleted maps

  6. # of Wheat Fields Surveyed from 2 Leaf - Soft Dough Stage of Kernel Development

  7. Occurrence of Wheat Leaf Rust 1999-2006 % of Surveyed Fields Positive for Leaf Rust Average % Severity of Leaf Rust over all Fields

  8. Data Reported the 9 Crop Reporting Districts of NASS (Ag. Statistical Service) NW NE NC WC CENT EC SW SC SE . All counties surveyed in each crop reporting district; at least one field per 10,000 acres

  9. 1999 Wheat Leaf Rust in ND Crop Reporting Districts % Fields with symptoms % Severity

  10. Spring Wheat Variety Response - Leaf Rust in ND ‘99 (Dr. Jack Rasmussen, NDSU) % coefficient of infection averaged over Langdon, Prosper, Carrington; 2375 especially low at Carrington; Reeder especially high at Carrington Coefficient of infection = severity x reaction type

  11. Occurrence of Wheat Leaf Rust 1999-2006 % of Surveyed Fields Positive for Leaf Rust Average % Severity of Leaf Rust over all Fields

  12. National Weather Service Precipitation Map June 2005 Source: NOAA

  13. Wet Weather Favored Diseases ~ 1300 wheat fields surveyed 56 fields with > 15% severity; Many with between 6-15%

  14. Statewide: 2005 Wheat Leaf and Stripe Rust Stripe Leaf

  15. Stripe Rust - HRSW Rxs one location data: Hettinger Research Extension Center 2005 % incidence

  16. 2005 Leaf Rust – HRSW cont. Dr. Jack Rasmussen & Jim Jordahl, NDSU Plant Path Dept. Coefficients of infection

  17. 2005 Leaf Rust – HRSW Dr. Jack Rasmussen & Jim Jordahl, NDSU Plant Path Dept.

  18. Occurrence of Wheat Leaf Rust 1999-2006 % of Surveyed Fields Positive for Leaf Rust Average % Severity of Leaf Rust over all Fields

  19. 10 fields with severity > 15% Most between 1-5%

  20. Questions? Questions? Photo by Marcia McMullen

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