2013 datcp wi crop disease survey results
TRANSCRIPT
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2013 DATCP
WI Crop Disease
Survey Results
Adrian Barta, DATCP Pest Survey Program
Anette Phibbs and Sue Lueloff, DATCP Plant
Industry Bureau Laboratory
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The DATCP Pest Survey
Program conducts monitoring
and detection surveys for
targeted exotic and key endemic
agricultural plant pests.
DATCP Pest Bulletin: http://pestbulletin.wi.gov/
DATCP Pest Survey web site:
http://pestsurvey.wi.gov/
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Highlights of 2013 Survey Season
• Phytophthora sansomeana continues to be detected
• Soybean Vein Necrosis-associated Virus shows up again
• Soybean Dwarf Virus detection stays high
• Cephalosporium stripe on wheat reappears
• Goss’s wilt occurred on corn inbreds, Stewart’s wilt didn’t
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Phytophthora sansomeana
Photo credit: Anette Phibbs, DATCP Plant Industry Laboratory
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Seedling
soybean survey
52 fields sampled
7 Phytophthora sojae
5 Phytophthora
sansomeana
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What’s the significance of Phytophthora sansomeana?
• corn
• alfalfa
• Balsam and Fraser fir (WI), Douglas (OR)
• white clover
• white cockle and wild carrot
Host range that includes corn and alfalfa along
with soybeans may mean rotation is not effective
to reduce inoculum levels in the soil.
Reported host range of P. sansomeana includes:
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Soybean vein necrosis-associated virus
(SVNaV)
Photo credit: fieldcroppathology.msu.edu
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Midway up or higher in canopy
Distinct from bacterial blight or bacterial pustule
Photo: Dr. Damon L. Smith
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What’s the significance of SVNaV?
For more information: UW Field Crops Pathology site
???
• probably vectored by thrips
• occurs late in season??
• impact on yield??
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Soybean dwarf virus
(SbDV)
Photo credit: Plantwise.org
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What’s the significance of SbDV?
• First detected in WI soybeans in 2003
• Vectored by aphids, though soybean aphid
is apparently a poor vector
• Widespread in red clover
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Aphid data: Krista Hamilton, DATCP Pest Survey
758
11
118 69
164
72 53 16 12 7
55
0
100
200
300
400
500
600
700
800
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Aphids per plant—statewide average
1.7 1.7 1.4
3.2 3.1
6.7
4.3
7.7
3.7
9.9 9.7
0
2
4
6
8
10
12
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
% of samples positive for SbDV
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Cephalosporium stripe of wheat
Photo: P. Esker
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• Historical observations suspected but not confirmed
• laboratory-confirmed in 2011
• In DATCP surveys (~40-50 fields per year),
found once in 2011 and once in 2013
• widespread in much of U.S.
• favored by cool, wet conditions
Cephalosporium stripe of wheat
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Diseases of Regulatory Concern on Corn
Photo credit: Sue Lueloff, DATCP Plant Industry Laboratory
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Corn hybrid seed production fields
Corn inbreds are the canaries of the field crop world—
they catch everything that comes along
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Goss’s wilt in corn inbred fields
69
57 58 57
45
3
35
20
3
8
0
10
20
30
40
50
60
70
80
2009 2010 2011 2012 2013
Total fields inspected
# of fields with Goss's wilt
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Viruses in corn seed production fields (45 fields):
• Wheat streak mosaic virus (WSMV) 0
• High Plains virus (HPV) 0
• Sugar cane mosaic virus (SCMV, syn. With MDMV) 9
SCMV
Image by Anette
Phibbs, DATCP
PIB Laboratory
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Image: August 1942, Vernon County, WI—Library of Congress Collection. Photo by Arthur Rothstein
DATCP is planning to discontinue
surveying for SCN—
Soybean growers in any county of the
state should test regularly
For info on free testing, visit
www.coolbean.info.
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You have a key role in exotic pest detection!
Image: U.S. Crop Corps, WWII
http://pestbulletin.wi.gov
http://pestsurvey.wi.gov/
Image:
US. Crop Corps, WWII