Western corn rootworm beetles emerging

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

click image to zoomPurdue UniversityWestern corn rootworm beetle emerging from the soil. Western corn rootworm beetles were first observed in Tippecanoe County, Indiana, on June 30, captured in pheromone baited sticky cards. The male beetles are generally first to emerge and hang out, feed, and wait for 7-10 days until females begin emerging. Females generally mate upon emergence, then feed and disperse, sometimes over long distances.

After emerging, beetles will begin to feed on corn leaves if pollen is not available. Leaf feeding damage is of no economic importance. However, pollinating plants with high beetle populations could suffer economic losses from the beetles clipping silks prior to the completion of pollination. Pest managers should closely watch their fields for this type of feeding activity when pollination begins. We have not seen high populations in Indiana for at least 4-5 years, but it’s still worth keeping an eye out. Now is the time to look for lodging in fields, especially following rains and wind. Pull, or dig (preferable) some suspicious plants and look for root damage. Rootworm is the only insect to cause root damage at this time of year. Rootworm damage to Bt corn is of special interest and should be noted and reported, as resistance to Bt traited corn has been reported in several states, including IL and MI, in the last several years.

Emergence will continue over several weeks, and adult beetles will survive until late summer. They are consistently attracted to pollen sources throughout their lifespan. Therefore, late-planted fields are particularly susceptible to silk-clipping. Fields with uneven growth and/or replanting may be more vulnerable than most. These delayed areas should be closely watched for silk clipping. For additional information on rootworm beetles and their control, see Extension Publication E-219-W, Corn Insect Control Recommendations - 2014, which can be viewed at http://extension.entm.purdue.edu/publications/E-219.pdf.


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


LPV Seed Treater

The LPV Seed Treater has set a new standard boasting three configurable weighing methods for any-sized operation, a standard 42” ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form