The corn crop is developing well with most fields reaching the VT (tassel) stage by August 1, which should allow crops to reach maturity before fall frosts. Growers who applied side-dress nitrogen prior to canopy closure are expected to see rewards from the recent rainfall. Corn rootworm and soybean aphid scouting should continue. Mark DeGroot has joined the DuPont Pioneer sales team as the new Account Manager for the territory covering Eastern South Dakota and Western Minnesota. Additional agronomy support will be provided by Field Agronomists Curt Hoffbeck and Larry Osborne to better serve growers in the region.

1. The 2013 crop has really started to show nice signs of
growth and development over the past few weeks. After
V10, the corn has been putting on almost one new leaf
every two to two and a half days or about every 50
GDUs. We average about 20-24 GDUs per day in the
months of July and August. A rule of thumb on any later
or replanted corn fields is that if they reach the VT
(tassel) stage by August 1, you have a good chance of
reaching physiological maturity before the first fall freeze
dates. It takes about 60 days from the VT/R1 stage to
black layer or physiological maturity in corn. Typical first
frost dates of 32°F for eastern South Dakota and south-
western Minnesota are between Sept. 24 and Oct. 4.
Average 28°F killing frost dates are typically seven to 14
days later.
With some of the larger amounts of rainfall that fell in
some areas, we would expect those growers who were
proactive and side-dressed nitrogen prior to canopy clo-
sure will be rewarded this year. It will be interesting to
follow side-dress N vs. check strips this season. The corn
rootworm (CRW) hatch has been delayed this year, but
signs of CRW feeding should soon be noticeable when
digging roots. Be sure to scout any late planted corn
fields as they could become prime targets for adult CRW
silk clipping that could in turn reduce pollination and yield.
Soybean aphids have been found in portions of South
Dakota and Minnesota and should be on your radar for
scouting too. Visual effects of IDC, SCN, and PRR have
been noticeable in quite a few soybean fields so far this
season.
On July 1, Mark DeGroot joined
the DuPont Pioneer team as an
Account Manager for territory KJM
in Eastern South Dakota/Western
Minnesota. Mark began the transi-
tion to his new territory on July 1,
2013 and replaces former Account
Manager, Jeff Behrens, who was
recently promoted to a DuPont
Pioneer Area Manger position in
northern South Dakota & southern
North Dakota.
Mark has been involved in a number of positions in agri-
culture and the seed industry, bringing a diverse perspec-
tive to the team. He worked as both a sales agronomist
and later the location manager of a retail location in
southeast South Dakota. For the past three years, he
served as an account manager for DuPont Pioneer in Io-
wa. Mark grew up on a dairy farm in northwest Iowa
and served 2 years in the United States Marine Corp be-
fore attending South Dakota State University where he
earned a B.S. in Ag-Business. Mark and his wife, Lisa,
have two children Payton, 11 and Pryia, 8. Mark stays
active coaching little league baseball, camping, golfing
and helping on the family farm. He and his family will
relocate to the Brookings, SD area.
Recently Pioneer announced the creation of locally-
focused commercial units to help strengthen our business
and position Pioneer to achieve the next level of service
excellence for growers. In short, we are taking the busi-
ness closer to the customer in portions of Eastern South
Dakota and West Central/Southwest Minnesota. This
market has some of the most intense agriculture in the
U.S. characterized by the rapid adoption and high utiliza-
tion of precision farming technology by innovative grow-
ers. As a result, you will see added agronomy and preci-
sion ag support from Field Agronomists, Curt Hoffbeck
and Larry Osborne. Curt Hoffbeck will serve all or parts of
Minnehaha, McCook and Lincoln Counties in South
WALKING YOUR FIELDS® newsletter is brought to you by your local account manager for DuPont Pioneer. It is sent to customers throughout the growing season,
courtesy of your Pioneer sales professional. The DuPont Oval Logo is a registered trademark of DuPont. PIONEER® brand products are provided subject to the
terms and conditions of purchase which are part of the labeling and purchase documents. ®, TM, SM Trademarks and service marks of Pioneer. © 2013 PHII.
Mark DeGroot Joins Area Sales Team
as Account Manager
Growing Degree Unit Update for the Area
Get to Know Your Local
DuPont Pioneer Sales Team
WALKING
YOUR FIELDS
®
www.pioneer.com
July 24, 2013 - Issue 4
Location
GDU
since
May 5
Departure
from
Normal
Predicted
GDUs to
7/28
(departure)
Alexandria, MN 1053 +53 1425 (+88)
Morris, MN 1144 +93 1516 (+143)
Montevideo, MN 1145 0 1519 (+25)
Marshall, MN 1168 +70 1545 (+102)
Brookings, SD 1089 +71 1456 (+102)
Sioux Falls, SD 1166 +8 1546 (+20)
Source: www.pioneer.com GDU Calculator
(May 5 through July 14, 2013)
<<

2. Dakota and Rock, Pipestone, Lincoln, and Lyon Counties
in Minnesota. He will work closely with sales reps and
growers in territories managed by Kevin Branick, Tony
Weis, and Ken Franzky.
Larry Osborne will serve west-central MN, including all or
parts of Yellow Medicine, Lac Qui Parle, Chippewa, Swift,
Big Stone, Stevens, Pope, Traverse, Grant and Douglas
Counties, as well as a bit of east-central South Dakota
including southern Brookings, Lake and Moody Counties.
He will work closely with sales reps and customers in ter-
ritories managed by Jim Kokett, Mark Gibson, John
Skoglund and Mark DeGroot.
Product Agronomist Wade Gubrud continues to provide
DuPont Pioneer product advancement and training sup-
port to parts of eastern South Dakota and west-central/
southwest Minnesota. Wade will oversee the Pioneer IM-
PACT™ plot testing program across this geography.
Dairy and Forage Specialist Matt Laubach will continue to
provide dairy and forage training and advice to employ-
ees, sale reps and local livestock and crop producers.
Please refer the back page of this newsletter to see a
listing of DuPont Pioneer Account Managers and the terri-
tories they serve. Let us know how we can provide addi-
tional service to your farm operation.
DuPont Pioneer and university research across 475 on-
farm trials conducted between 2007-2011 shows corn
yields increases an average of 7 bu/acre in response to a
foliar fungicide application. The average yield response is
generally greater in fields with large amounts of residue
on the soil surface, such as corn-following-corn, and no-
till or strip-till. Later-maturing fields can also be at greater
risk to foliar disease and are more likely to benefit from a
fungicide application.
DuPont Pioneer experts recommend scouting for foliar
diseases in corn just before tassel emergence. However,
do not apply any foliar fungicide applications until the en-
tire field reaches the VT stage to reduce the potential for
crop injury in the form of “arrested ears” that can reduce
yields.
Consider the following factors when planning an applica-
tion of foliar fungicide:
Previous Crop. Many foliar pathogens survive in corn
residue. The risk
of foliar diseases,
such as gray leaf
spot and northern
leaf blight, in-
creases when
corn is planted
into a field that
was corn the pre-
vious year.
Weather Condition. Rainy and/or humid weather is most
favorable to foliar diseases. The disease risk increases in
growing seasons when these conditions prevail. Summer
fog creates ideal conditions for development of corn foliar
diseases, especially gray leaf spot.
History of Disease. Some field locations may have a
history of greater foliar disease severity. Fields in river
bottoms, low areas or surrounded by trees may be more
prone to foliar corn diseases.
Hybrid Resistance. If the disease resistance rating is a
six or greater, a fungicide application may not provide a
yield benefit. For susceptible products with disease rating
less than four, spray, if disease symptoms are present,
on the third leaf below the ear or above on 50 percent of
the plants examined.
For intermediate products with disease rating of five, de-
termine if disease symptoms are present on the third leaf
below the ear or above on 50 percent of the plants exam-
ined. Also consider the above factors, spraying if the field
is in an area with history of foliar disease, a corn-on-corn
planting, contains 35 percent or more surface residue and
weather is warm and humid.
Foliar Fungicide Decisions in Corn
Don’t apply too early. Damage from fungicides and NIS is often
associated with fields that were treated prior to tasseling. If the appli-
cation is too early, there is a high probability that the non-ionic surfac-
tant will damage the ears.

3. Goss’s wilt is beginning to show up in corn fields around
the central U.S. again this year. In 2012, the disease was
found throughout much of the area despite the dry condi-
tions in late summer and fall.
This season,
high winds
along with sand/
soil blasting that
has occurred
throughout June
has likely creat-
ed the kinds of
injury necessary
for Goss’s wilt
bacteria to enter
corn plants. The
prolonged wet
weather this
spring is condu-
cive to bacterial diseases in many crops, and corn has
been no exception. Goss’s wilt is caused by a bacterial
pathogen and doesn’t respond to treatment with fungi-
cides. It is best man-
aged with resistant
hybrids and sound cul-
tural practices.
Risk factors to con-
sider when planning
for Goss’s wilt man-
agement:
 History of the dis-
ease in a field in last
year or two indicates
presence of inoculum
 Continuous corn raises the risk of inoculum build-up
 Reduced tillage tends to lead to slower residue break-
down and greater risk that inoculum will remain in af-
fected fields
 Irrigated fields tend to have higher levels of disease
incidence and severity
Pioneer®
Field360™ Notes App pinpoints your field loca-
tion via satellite imagery so you can record notes or pho-
tos on the spot.
 Display field boundaries for DuPont Pioneer customers
 Easy to use interface; available for iOS and Android™
 Instantly map and organize data with
notes and photos
 Share your data from the field via
email
Pioneer® Field360™ Tools App
The Pioneer® Field360™ Tools app includes three pow-
erful calculators that help growers make
decisions on the go. The app features a
powerful Growing Degree Unit (GDU)
calculator, as well as Precipitation Esti-
mator and Growth Stage Estimator to
monitor and estimate crop development
through each year.
Pioneer Field360 Tools app includes easy to use features
such as one-time input of location, start date and relative
maturity (CRM). This allows you to easily navigate be-
tween the calculators without re-entering data.
Go to www.pioneer.com/apps to access the latest apps
from Pioneer.
Pioneer®
Field360™ Select software is an interactive,
web-based subscription service that combines your field
data with real-time agronomic and weather information
 Track field by field Precipitation and GDUs using Field
360 Select
 Scouting 101 with GPS located as-planted Products
 On-The-Go organized field applied data
Contact your local Pioneer Professional for more info!
Download Pioneer®
Field360™ Apps
Goss’s Bacterial Wilt & Blight
Positive Goss’s Wilt sampling sites in ND, SD,
MN and WI in 2012.
Goss’s wilt symptoms on corn leaf.
Photo: DuPont Pioneer

4. WALKINGYOURFIELDS®
KJ Gubrud, Hoffbeck, Osborne
DuPont Pioneer
Sales & Marketing
PO Box 466
Johnston, IA 50131
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