Watch for Japanese beetle on 'silking' corn

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


Japanese beetles feeding on corn silks. Japanese beetles have been emerging over the last couple of weeks. With the general rainfall we had on June 11, this emergence is likely to quicken. While this insect will feed on corn leaves, its only real importance is when feeding on emerging silks. This silk feeding can interfere with pollination resulting in incomplete kernel set. 

These insects are metallic green beetles about ½ “ long. They have a row of white tufts on either side of the body below the bronze wing covers. The beetles will congregate (sometimes in very large numbers) on ear tips and feed on the silks, thus preventing proper pollination.

Normally, this insect is not a major pest of corn. However, in this year because of the mild winter and very warm spring the pest is emerging at an earlier date. Also, because of the dry soil conditions in the western part of the state, the emergence which is normally spread out in time, may occur over a much shorter period producing an unusually large number of beetles seemingly all at once.

Scout for this insect by examining several individual groups of 20 consecutive ears. Determine if the silks have been clipped to within 1/2” in length. Additionally, count the number of beetles per ear and average these numbers for the twenty ears per sample, then average all the samples taken in the field. Treatment may be necessary if silks have been clipped to ½” and there are three or more beetles per ear.

If pesticide application becomes necessary, pesticides useful for control of Japanese beetle can be found in ENT-16, Insecticide Recommendations for Corn-2012, which may be obtained from your County Extension Office or on line at: http://pest.ca.uky.edu/EXT/Recs/welcomerecs.html


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 (1) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left

Liliana    
Peoria, IL  |  July, 04, 2012 at 10:44 PM

Japanese beetle infestation was spotted in the cornfields of the Dunlap, IL area on the 4th of July. Beetles are feeding on emerging silk.


Field Profit Planner Dashboard

With GEOSYS Field Profit Planner, you can plan for the future using information from previous years. Agronomic decisions made during ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form