Marcia McMullen

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
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
Average Severity of Leaf Rust and Fungal Leaf
Spots, ND 2001
12
(No Transcript)
13
(No Transcript)
14
Occurrence of Wheat Leaf Rust 1999-2006
of Surveyed Fields Positive for Leaf Rust
Average Severity of Leaf Rust over all Fields
15
National Weather Service Precipitation Map June
2005
Source NOAA
16
Wet Weather Favored Diseases
1300 wheat fields surveyed
56 fields with gt 15 severity Many with between
6-15
17
Statewide 2005 Wheat Leaf and Stripe Rust
Stripe Leaf
18
Stripe Rust - HRSW Rxs one location data
Hettinger Research Extension Center 2005
incidence
19
2005 Leaf Rust HRSW cont. Dr. Jack Rasmussen
Jim Jordahl, NDSU Plant Path Dept.
Coefficients of infection
20
2005 Leaf Rust HRSW Dr. Jack Rasmussen Jim
Jordahl, NDSU Plant Path Dept.
21
Occurrence of Wheat Leaf Rust 1999-2006
of Surveyed Fields Positive for Leaf Rust
Average Severity of Leaf Rust over all Fields
22
10 fields with severity gt 15 Most between 1-5
23
Questions?
Questions?
Photo by Marcia McMullen