marcia mcmullen dept. of plant pathology north dakota state univ. fargo, nd leaf rust detection in...
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![Page 1: Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND Leaf Rust Detection in ND Wheat Surveys, 1999-2006](https://reader035.vdocument.in/reader035/viewer/2022070323/56649dc65503460f94aba93b/html5/thumbnails/1.jpg)
Marcia McMullenDept. of Plant PathologyNorth Dakota State Univ.
Fargo, ND
Leaf Rust Detection in ND Wheat Surveys, 1999-2006
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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
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Real Time Information Provided
Ag Alerts for Growers Weekly Crop and Pest Report IPM Web Site
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ND Wheat Surveys Collaborative Effort: NDSU Extension Area Specialists and 2 NDSU Extension State Specialists
Denise MarkelNCREC
*Roger AshleyDREC
•Greg EndresCREC
•Terry GregoireDevils Lake Area
•Marcia McMullen• Jan KnodelSE area
Funded by ND Wheat Commission, ND Dept. of Ag., APHIS –ARSCooperative Pest Survey
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The Wheat Survey Uses Technology to Improve Information Delivery
1. Field Scouts trained in pest ID &scouting methods
Field records go from Excel database to mapping program.
Interpolated Grid map
Bulleted maps
Record fielddata using iPAQsand GPS
2.
3.
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738
1053957
847
1039
1471
1341
1147
400
800
1200
1600
1999 2000 2001 2002 2003 2004 2005 2006
# of Wheat Fields Surveyed from 2 Leaf - Soft Dough Stage of Kernel Development
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0
10
20
30
40
50
60
70
1999 2000 2001 2002 2003 2004 2005 2006
Occurrence of Wheat Leaf Rust 1999-2006
% of Surveyed Fields Positive for Leaf Rust
Average % Severity of Leaf Rust over all Fields
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NWNC NE
SW SC
WCCENT EC
SE
Data Reported the 9 Crop Reporting Districts of NASS (Ag. Statistical Service)
.All counties surveyed in each crop reporting district; at least one field per 10,000 acres
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1999 Wheat Leaf Rust in ND Crop Reporting Districts
0
10
20
30
40
50
60
70
80
90
SE EC SC C NE NC NW WC SW
% Fields with symptoms
% Severity
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Spring Wheat Variety ResponseSpring Wheat Variety Response - - Leaf Rust in ND ‘99 (Dr. Jack Rasmussen, NDSU)
0 10 20 30 40 50
Grandin
ACBarrie
2398
Gunner
Forge
Reeder
2375
Parshall
Oxen
Kulm
Keene
Russ
Amidon
% coefficient of infectionaveraged over Langdon,Prosper, Carrington;
2375 especially low atCarrington;Reeder especially high atCarrington
Coefficient of infection = severity x reaction type
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0
10
20
30
40
50
60
70
1999 2000 2001 2002 2003 2004 2005 2006
Occurrence of Wheat Leaf Rust 1999-2006
% of Surveyed Fields Positive for Leaf Rust
Average % Severity of Leaf Rust over all Fields
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National Weather Service Precipitation Map June 2005
Source:NOAA
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Wet Weather Favored Diseases~ 1300 wheat fields surveyed
56 fields with > 15% severity;Many with between 6-15%
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Statewide: 2005 Wheat Leaf and Stripe Rust
27.5
48.5
5.4
0
20
40
60
% all fields with leaf rust% fields > flag leaf with leaf rust% all fields with stripe rust
Stripe Leaf
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Stripe Rust - HRSW Rxs one location data: Hettinger Research Extension
Center 2005
0
10
20
30
40
50
60
70
80
90
100
AlsenBiggRed
HannaOkleeGlenn FryerGrangerSteeleND
GraniteKnudson
BriggsPolarisRussOxenUlen
TrooperDapps
BuckPronto
ReederExpress
% incidence
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2005 Leaf Rust – HRSW cont.Dr. Jack Rasmussen & Jim Jordahl, NDSU Plant Path Dept.
3.8
7.3
8.7
11
22.7
26.3
36.7
38.7
0 10 20 30 40 50
Granger
Briggs
Alsen
Granite
Russ
Hanna
Oxen
BiggRed
Coefficients of infection
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2005 Leaf Rust – HRSW Dr. Jack Rasmussen & Jim Jordahl, NDSU Plant Path Dept.
0.7
1
1.2
1.3
1.4
1.5
1.7
2
2.5
0 10 20 30 40 50
Glenn
Dapps
Fryer
SteeleND
BckPrnto
Ulen
Knudson
Oklee
Trooper
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0
10
20
30
40
50
60
70
1999 2000 2001 2002 2003 2004 2005 2006
Occurrence of Wheat Leaf Rust 1999-2006
% of Surveyed Fields Positive for Leaf Rust
Average % Severity of Leaf Rust over all Fields
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10 fields with severity > 15%Most between 1-5%
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Questions?Questions?
Photo by Marcia McMullen