Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND Leaf Rust Detection in...
-
Upload
charity-boyd -
Category
Documents
-
view
215 -
download
0
Transcript of Marcia McMullen Dept. of Plant Pathology North Dakota State Univ. Fargo, ND Leaf Rust Detection in...
Marcia McMullenDept. of Plant PathologyNorth Dakota State Univ.
Fargo, ND
Leaf Rust Detection in ND Wheat Surveys, 1999-2006
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
Real Time Information Provided
Ag Alerts for Growers Weekly Crop and Pest Report IPM Web Site
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
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.
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
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
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
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
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
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
National Weather Service Precipitation Map June 2005
Source:NOAA
Wet Weather Favored Diseases~ 1300 wheat fields surveyed
56 fields with > 15% severity;Many with between 6-15%
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
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
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
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
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
10 fields with severity > 15%Most between 1-5%
Questions?Questions?
Photo by Marcia McMullen