Welcome!
May 7, 2007
CORN
Time to Scout for Cutworms
With the
early corn emergence and past warm temperatures, cutworm damage may appear
earlier than normal this year A network of pheromone
traps across Iowa indicated that a significant flight of black cutworm moths occurred
in southern Benton county on April 6. This does not necessarily indicate that
we will have a problem with cutworms, but does tell us when to start scouting
for corn cutting. Based on degree days accumulated, cutting could begin this
weekend in that area. Moth flights were later in the rest of the state. Most
years black cutworms are not a problem, but it’s prudent to take some time and
monitor fields until they reach V5 (5 leaves fully emerged from the whorl). An
insecticide treatment is recommended if 2-3% of the plants are cut and the
cutworms are less than ¾ inch long. When cutworms reach 1 inch long, 5% cutting
is the threshold. An article showing predicted cutting dates for the rest of
the state will appear next week in the ICM News. For a past article on black
cutworm management, with pictures on how to distinguish between black and dingy
cutworms see http://www.ipm.iastate.edu/ipm/icm/2005/5-16-2005/cutworm.html.
Cold Weather
The growing point on corn is
below the soil surface until the corn is about a foot tall, so even if we get
some frost this weekend, it should not be detrimental to emerged corn. The cold
spell could have more of an effect on corn that
was more recently planted and is in the process of germinating and emerging.
Cold weather during this time can “disorient” the growing seedling and result
in reduced vigor, and also increases the risk of seedling diseases. Roger
Elmore and Lori Abendroth have a nice article on this at https://www.extension.iastate.edu/CropNews/2010/0505elmoreabendroth.htm.
FOR YOUR CALENDAR
SPRING FIELD DAY & SPECIAL
SESSION FOR CCAs
SE IA RESEARCH FARM –
CRAWFORDSVILLE
JUNE 24
The Spring Field Day of the Southeast Research and Demonstration
Farm (Crawfordsville) will be on the afternoon of Thursday, June 24, 2010 at
the farm. Certified Crop Advisor (CCA) credits will be available.
The field day will feature Erin Hodgson on new advances in soybean aphid
management, Matt Helmers on Tile Drainage Research results, Emily Heaton, on Miscanthus and other Cellulosic Ethanol Crops, and Johns
Sawyer on Nitrogen Management and Cover Crops. In addition, Certified Crop
Advisors can obtain additional hours of credit (including soil and water) by
attending a special session in the morning followed by the afternoon
tour. Soil drainage will be featured in this special session. More
details will be posted at https://www.extension.iastate.edu/Pages/eccrops/meetserc.html.
If you have any questions, please feel free to contact the Iowa State University Extension Office.
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