50
Insects and Mites
Wisconsin Pest Bulletin 6/12/14 and 6/19/14 ................. 50
Wisconsin 2014 Pest Management Field Day ................ 50
Plant Disease
Plant Disease Diagnostic Clinic (PDDC) Update ........... 51
Wisconsin Winter Wheat Disease Update for June 19 ... 51
Wisconsin Soybean Disease Update June 19 ................. 52
Fertility and Soil
Potential for Nitrogen Loss Following Heavy
Rainfalls ......................................................................... 53
Crops
Vegetable Crop Update 6/15/14 ..................................... 53
UW Crop Diagnostic Training Center Workshops
for 2014 .......................................................................... 53
Wisconsin Pest Bulletin 6/12/14 and 6/19/14
A new issue of the Wisconsin Pest Bulletin from the
Wisconsin Department of Agriculture, Trade and Consumer
Protection is now available. The Wisconsin Pest Bulletin
provides up-to-date pest population estimates, pest distribution
and development data, pest survey and inspection results, alerts
to new pest finds in the state, and forecasts for Wisconsin’s
most damaging plant pests.
Issue No. 7 of the Wisconsin Pest Bulletin is now available at:
http://datcpservices.wisconsin.gov/pb/pdf/06-12-14.pdf
Issue No. 8 of the Wisconsin Pest Bulletin is now available at:
http://datcpservices.wisconsin.gov/pb/pdf/06-19-14.pdf
Wisconsin Pest Bulletin Site:
http://datcpservices.wisconsin.gov/pb/index.jsp
Wisconsin 2014 Pest Management Field Day
Bryan Jensen, University of Wisconsin IPM Program
Pest Management Field Day
June 26, 2014, 8:30 am
Arlington Agricultural Research Station.
Our field day features several topics presented by University of
Wisconsin faculty, staff and students. Pre-registration is NOT
required and the field day has been accepted for 2.0 CEU in
Pest Management.
Speakers and Topics include:
Environmental Impacts on Soybean Management
Decisions Shawn Conley, UW-Extension/Madison soybean and
small grains specialist, and David Marburger and
Adam Gaspar UW-Madison Department of
Agronomy
Pest Management Mobile Mark Renz, UW-Extension/Madison weed scientist:
Thrips Dispersal and Soybean Vein Necrosis Virus
(SVNV) in Wisconsin Soybean Damon Smith, UW-Extension/Madison plant
pathologist and Chris Bloomingdale, UW-Madison
Department of Plant Pathology:
2014 Alfalfa Fungicide Evaluation Damon Smith, UW-Extension/Madison plant
pathologist:
Soybean White Mold Research Update and
Treatment Evaluation Damon Smith, UW-Extension/Madison plant
pathologist and Jamie Wilbur UW-Madison
Department of Plant Pathology
Herbicide Resistance Research Update for
Wisconsin Palmer Amaranth and Waterhemp
Populations Tommy Butts, UW-Madison Department of
Agronomy
Update on Giant Ragweed Resistance in Wisconsin Dave Stoltenberg and Stacey Marion, UW-Madison
Department of Agronomy:
Volume 21 Number 16 - - - University of Wisconsin Crop Manager - - - June 19, 2014
51
Take Action Against Herbicide Resistance;
Resources and Pigweeds Research Update Liz Bosak, UW-Madison Department of Agronomy
The Value of Transgenic Hybrids in an IPM
Program Joe Lauer, UW-Extension/Madison corn specialist
Tours will leave the Public Events Building promptly at 8:30
a.m. and conclude by noon. In the event of rain, speakers will
present their topics inside the Public Events Building. A light
lunch will be served at the conclusion.
Stay after lunch for a Wisconsin Crop Weed Science (WCWS)
herbicide evaluation results and plot tour. Vince Davis, UW-
Extension weed scientist, with his staff and students will lead
an informal tour of the weed science field research plots.
No preregistration is required and CCA Credits will be applied
for.
The Public Events Facility is located on the Arlington
Agricultural Research Station, N695 Hopkins Road. If
traveling from the south, exit I 90/94 onto Hwy 51 North. Look
for the Arlington Ag. Research Station sign north of Deforest.
Turn left (west) onto Badger Lane. Travel 1 mile and turn left
(south) onto Hopkins Rd. If traveling from the north, exit I
90/94 onto Hwy 60. Travel east through Arlington and turn
south onto Hwy 51. For more detailed driving direction click
on http://www.ars.wisc.edu/arlington/directions.html
Plant Disease Diagnostic Clinic (PDDC) Update
Brian Hudelson, Ann Joy, Joyce Wu, Tom Hinsenkamp, and
Catherine Wendt, Plant Disease Diagnostics Clinic
The PDDC receives samples of many plant and soil samples
from around the state. The following diseases/disorders have
been identified at the PDDC from June 7, 2014 through June
13, 2014.
Plant/Sample Type, Disease/Disorder, Pathogen, County\
FRUIT CROPS,
Apple/Pear, Cytospora Canker, Cytospora sp., Monroe
Apple/Pear, Fire Blight, Erwinia amylovora, Monroe
Strawberry, Root/Crown Rot, Phytophthora sp., Pythium sp.,
Fusarium sp., Cylindrocarpon sp., Chippewa, Wood
VEGETABLES,
Basil, Downy Mildew, Peronospora belbahrii, Dane
Tomato, Gray Mold/Botrytis Blight, Botrytis cinerea, Portage
For additional information on plant diseases and their control,
visit the PDDC website at pddc.wisc.edu.
Wisconsin Winter Wheat Disease Update for June 19, 2014
Damon L. Smith – Extension Field Crops Pathologist,
University of Wisconsin
I have scouted winter wheat fields and variety trials from
Arlington Wisconsin up through Chilton Wisconsin this week,
between rain showers. Wheat in these areas is nearly finished
flowering. The window of opportunity to spray fungicides in
these areas to control Fusarium head blight (scab) in winter
wheat has now passed.
Figure 1 FHB Prediction Center Risk Assessment for June 19
Currently the Fusarium Head Blight Prediction Center
(http://www.wheatscab.psu.edu) is predicting moderate to high
risk for head blight for the Door county peninsula and areas
immediately adjacent to Green Bay (Fig. 1). Winter wheat that
is currently flowering in this area of the state is at high risk for
infection by the fungus that causes scab. The prediction center
is currently predicting low levels of scab in other parts of the
state. This should be monitored closely by growers with barley.
Some late-planted barley will be emerging from the boot soon
and this is the window of opportunity to control scab if
conditions are conducive. With all the rain and warm
temperatures across the state this week, I would suspect that
the risk for scab on barley and any remaining flowering winter
wheat will be elevated this weekend across much of the state.
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If a fungicide is warranted for control of scab on winter
wheat in the Door County area or barley, products such
Prosaro, Caramba, or similar that contain triazole active
ingredients can offer suppression of scab and reduce
deoxynivalenol (DON) accumulation in harvested grain. These
products should be applied within a week from the beginning
of flowering for reasonable control. Products containing
strobilurin fungicides should be avoided on wheat that has
headed. Research has demonstrated that levels of DON can be
higher after treatment with strobilurin products after heading.
While scouting winter wheat fields at University of
Wisconsin variety trials in the southern and eastern part
of Wisconsin this week, I observed no rust or powdery
mildew. Trace levels of barley yellow dwarf were noted at all
locations. At the Fond du Lac variety trial, high levels of
Cephalosporium stripe (Fig. 2) were noted on certain
varieties. This location has seen short rotations between wheat
crops, likely contributing to this epidemic. We also noted high
incidence (90%) of bacterial leaf blight on several varieties at
this location. Some bacterial leaf streak was also observed, but
incidence was less than 10%. Very low levels of
Stagnospora/Septoria leaf blotch were noted. Most varieties
had just completed flowering at this location and no scab was
observed as of yet.
Figure 2. Cephalosporium Stripe symptoms on Winter Wheat.
At the Chilton Variety trial, diseases are nearly absent. The
only disease noted on several varieties was bacterial mosaic at
low incidence (<5%). Cereal leaf beetle damage was moderate
across many varieties in this trial. Larvae were also found on
flag leaves, but levels were below the economic threshold as of
Tuesday. Again at this location, most varieties had just
completed flowering and no scab was observed as of yet.
Wisconsin Soybean Disease Update June 19, 2014
Damon L. Smith – Extension Field Crops Pathologist,
University of Wisconsin
Soybean planting has finally finished up for our research
program. We planted our last, late planting date trial this
week. Soybeans around the state have emerged and are at the
VC or early V1 stage. Several diseases have been noted
already this year in soybeans.
With all of the rain we have been seeing early symptoms of
Septoria brown spot (Fig. 1). This is a common disease of
soybean in Wisconsin and is caused by the fungus Septoria
glycines. While scouting a field near Fond du Lac this week,
we observed the characteristic purple-brown lesions (Fig. 2)
caused by this fungus, on the unifoliate leaves of soybean
plants. This isn’t unusual considering the moderate
temperatures and frequent heavy rain. The spores of this
fungus are typically rain splashed from old soybean debris, to
the growing plants. Septoria brown spot is usually not
considered a yield limiting disease, but in certain cases, it has
been attributed to significant yield loss. This is usually the
case where a susceptible variety is grown in a location
conducive to the disease and rain is frequent and heavy. In a
situation like this, fungicides might be required during the
reproductive phase of growth to preserve yield. However, most
of the time, Septoria brown spot is observed early in the season
and again late in the season during periods of heavy rainfall
and does not affect yield. I suspect, once the rain subsides a
bit, this disease will also subside. However, growers and
consultants should keep an eye on it just in case it does not. To
learn more about Septoria brown spot, visit the brown spot
information page by clicking here.
Figure 1. Septoria brown spot on a soybean seedling.
Reports of seedling diseases are also starting to roll in as a
result of the very wet conditions and frequent rainfall. Pythium
damping off and root rot is a likely culprit in many of these
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Follow us on
fields. Cool wet soil conditions at planting and during seedling
emergence favor this disease. There are many species of
Pythium that can infect soybean and soybean pathologists are
currently conducting a study to identify these species. An
informative pocket guide has been developed. You can
download a PDF version of the pocket guide by clicking
here. You will note that management focuses on adjusting
planting date and using seed treatments to protect against
infection by Pythium species. Foliar fungicide application is
NOT recommended for this disease.
Figure 2. Purple-brown lesions characteristic of early Septoria
brown spot symptoms.
Other seed and seedling diseases might also be plaguing
soybeans with all of the wet weather. Other pathogens include
Rhizoctonia and Phytopthora. To learn more about other seed
and seedling issue of soybean in Wisconsin, click here and
scroll down to “seedling diseases.” You will find helpful
resources pertaining to many of the common seedling
issues. Also for specific information on Phytopthora root and
stem rot of soybean, you can download a UWEX fact sheet by
clicking here.
Growers and consultants should scout soybeans for disease
frequently during this cool wet weather. Hopefully the rain
will subside soon. Some dry weather will help slow down the
advancement of many soybean diseases.
Potential for Nitrogen Loss Following Heavy Rainfalls
Carrie Laboski, Soil Fertility/Nutrient Management Extension
Specialist
Some areas in the state have experienced heavy rainfall that has
resulted in water standing in fields. If you are concerned about
potential N loss following heavy rainfall please read:
http://www.npketc.info/?p=180
Flooded Soybean Field
Vegetable Crop Update 6/15/14
The 9th
issue of the Vegetable Crop Update is now available.
This issue contains an Herbicide update - Upbeet for garden
beet, Late blight updates, Blitecast and P-Days for late blight
and early blight management, and information on Basil downy
mildew. Click here to view this update.
UW Crop Diagnostic Training Center Workshops for 2014
Registration is open for UW-Madison Integrated Pest
Management Program’s two Crop Diagnostic Training Center
workshops for 2014. The Diagnostic Troubleshooting
Workshop will be held July 15, 2014. The Crop & Pest
Management Workshop will be held August 5, 2014.
FAST and easy ONLINE registration by credit card:
https://patstore.wisc.edu/ipm/register.asp
Both workshops will be hosted at the Arlington Agricultural
Research Station. Be aware that this is not a ³traditional² field
day. These training sessions are designed to be primarily in-
field and hands-on. We advise that attendees come prepared to
be in the field and ready for all types of weather. CCA CEU¹s
are available as listed, but are subject to change pending
approval from the Certified Crop Advisor Program.
Contact Dan Heider at 608-262-6491, or email
To view the flyer for these workshops follow the link below or
scroll down to the end of this newsletter.
http://ipcm.wisc.edu/download/misc/CDTC2014-flyer5.pdf
Diagnostic Troubleshooting WorkshopJuly 15, 2014, Arlington Ag Research StationCCA CEU’s: 4.0 Tiered fee: $75 before 7/1/11, $90 after 7/1/11
● 9:00 Registration and introduction ● 12:00 Lunch (provided) ● 2:15 Adjourn
This Workshop gives you the opportunity to fine tune your crop diagnostic skills in a fun and interactive setting. Small groups will rotate through field problems with UW Specialists role playing as farmers.Through digging up plants, asking questions and con-
sulting references, participants will make a diagnosis of the problem being observed and a recommendation for correction. Each participant will experience eight sepa-rate diagnostic scenarios.
Crop & Pest Management WorkshopAugust 5, 2014, Arlington Ag Research StationCCA CEU’s: 0.5 Crop, 3.5 Pest, 1.0 Nutrient ManagementTiered fee: $75 before 7/25/14, $90 after 7/25/14
● 8:30 Registration and introduction ● 12:00 Lunch (provided) ● 2:45 Adjourn
This workshop will cover agronomic concerns ranging from identification of crop and pest production problems to management options within production systems.
Nutrient uptake and partitioning in soybean - Shawn Conley, Extension Soybean and Small Grains Specialist
● Soybean nutrient requirements effects on the growth and development of high yielding soybeans
Herbicide Mode of Action - Vince Davis, Extension Weed Specialist
● Herbicide mode of action and emerging crop technologies; their use and resistance management strategies
The trait game - Bryan Jensen, UW Integrated Pest Management Specialist
● Management strategies for Bt resistant western corn rootworm; their efficacy and effectiveness in delaying the development of resistance
SCN / SDS Interaction - Damon Smith, Extension Plant Pathology Specialist
● Soybean cyst nematode and sudden death syndrome symptoms; current research on interactions between SCN and the SDS causing fungus
Spray drift mitigation in crop pest management - Daniel Heider, UW Integrated Pest Management Specialist
● Drift reduction, emerging herbicide resistant technologies, nozzles and other drift reduction technology in field settings
Crop Diagnostic Training Workshops 2014UW-Madison Integrated Pest Management Program
Both workshops begin in the Public Events Facility of the Arlington Agricultural Research Station. Be aware that this is not a “traditional” field day. Training sessions are designed to be primarily in-field and hands-on. We advise that you come prepared for all types of weather.
FAST and easy ONLINE registration by credit card: https://patstore.wisc.edu/ipm/register.asp
Contact: Dan Heider, 608-262-6491, [email protected] CEU’s are subject to change pending approval from the Certified Crop Advisor Program.