Predicted corn rootworm hatch begins for 2012

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article


Corn rootworm egg hatch in Iowa can occur from late May to the middle of June, depending on accumulating soil degree days, but the average hatching date is around June 6th. Research suggests about 50 percent of egg hatch occurs between 684-767 degree days (base 52°F, soil). Although Iowa had a warmer than normal March, soil temperatures have been closer to normal in April and May. So the 2012 predicted corn rootworm egg hatch is only slightly ahead of normal (Photo 1), but about two weeks ahead of the 2011 growing season. The southwest region in Iowa is experiencing 50 percent egg hatch now and other parts of the state will approach it within 7-14 days depending on the temperature. Other states have also reported that corn rootworm egg hatch is underway. Illinois is reporting the earliest initial egg hatch in 35 years.

click image to zoomIowa Environmental Mesonet, ISU Department of AgronomyPredicted corn rootworm egg hatch in Iowa for 2012. Expect 50 percent hatch to between 684-767 degree days. Roger Elmore, ISU Corn Extension Agronomist, recently reported Iowa is 6 percent ahead of a normal corn planting year. So although predicted corn rootworm egg hatch is slightly ahead of normal, the larvae should have sufficient root tissue to feed on because most corn will be germinated by the time the eggs hatch. Saturated soils will diminish overall corn rootworm pressure, and the high adoption of Bt corn should decrease populations in most fields. However, I anticipate a good larval establishment this year. Early egg hatch could mean we see earlier adult corn rootworm emergence, too.

click image to zoomPhoto by Brent PringnitzRating corn rootworm damage is essential for assessing current management plans. Shortly after egg hatch, young larvae will begin feeding on root hairs and inside roots. As they develop, larvae will begin feeding on root tips. A severe infestation can destroy nodes 4-6 which interferes with water/nutrient uptake and makes the plant unstable. Every field should be scouted for corn rootworm damage regardless of the seed selection (i.e., dig and rate corn roots even if Bt proteins are used). Continuous corn fields and areas with persistent corn rootworm populations are the highest priority for inspection. Assess corn rootworm root injury and adjust management strategies if the average injury is above 0.5 on a 0-3 rating scale (Photo 2). Aaron Gassmann (ISU Corn Entomologist) has a Web page for additional corn rootworm management information, including an interactive node-injury scale demonstration and efficacy evaluations.


Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


AppliMax Spray Nozzle Lights

Features & Options: Spraying when there is low, or no light lets you get more acres done and apply more ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form