Cereal Leaf Beetle in Corn

We spent a fair amount of time scouting wheat fields for cereal leaf beetles earlier in the season. Now it is time to focus attention on adjacent corn fields. The adult cereal leaf beetles can now be found in adjacent corn fields. They are primarily found on the perimeter of the corn fields. Though I have encountered them throughout some corn fields. Adult cereal leaf beetle damage appears as longitudinal slits between the leaf veins. Corn plants usually outgrow the injury. Unlike larval damage in wheat, there are no firm thresholds for adult damage in corn. One threshold suggests treatment when 10 or more adults are found per plant and 50% of plants show feeding damage.

Cereal Leaf Beetle Adult
Courtesy Virginia Tech Cooperative Extension

                                                         
Bill Bamka

Soybean Replanting Decisions

I have received several calls about soybean replanting. Making a replanting decision is never an easy task. When evaluating reduced or uneven stands there are a few things to take into consideration. First, do you know what caused the problem in the first place? Planting too deep? Improper planter settings? Herbicide injury? Insect feeding? Possibly planting too early, followed by slow growing conditions? If you do not know what happened the first time, you could be setting yourself up for failure again if you do not address the problem. Second, before deciding to replant you need to determine the density of your current stand. The Hula Hoop method or counting plants in 1/1000 of an acre can be used to do this. Once you know your stand count you can estimate the yield potential of your field. Making the decision to replant can be agonizing, however there are resources to help growers. Purdue University has published a good Soybean Production System fact sheet that clearly guides growers through the replant decision.

Bill Bamka

Keep Alert for Slugs in Soybeans

The recent wet weather can create the opportunity for slug damage in newly planted soybean fields. Occasionally, we have had fields that required replanting due to slug damage. No till fields can be at greater risk for slug problems. Be sure to scout low lying fields and fields with heavy residue. More information on life cycle and pest management options are available in Penn State's fact sheet "Slugs as Pests of Field Crops." 

Bill Bamka

Soybean Double Cropping

While some growers are still trying to plant or replant first crop beans, double crop opportunities will likely be occurring in about 2-3 weeks. Courtesy of your soybean checkoff dollars, a webcast is availble to view with tips on various management practices. Although originating out of Virginia, many of the tips are helpful here in NJ.

http://www.plantmanagementnetwork.org/edcenter/seminars/soybean/DoubleCropped/
This 20-minute webcast is open access. Viewers can also opt to see a 5-minute executive summary version. This shorter executive summary version is permanently open access courtesy of the United Soybean Board.
Other Focus on Soybean presentations can be viewed at www.plantmanagementnetwork.org/fos.
Focus on Soybean is a publication of the Plant Management Network. To get the most out of the Plant Management Network’s full line of resources, please sign up for PMN’s free electronic newsletter, PMN Update.

PMN Update:
http://www.plantmanagementnetwork.org/update/default.cfm

Zane Helsel

Calibration of Spray Equipment

-Stephen Komar and Bill Bamka

We have been getting calls related to proper spray calibration.

A simple way to perform a calibration is the 1/128th method. This method is based on spraying 1/128th of an acre per nozzle and simply collecting the spray released during the time it takes to travel over that area. Since there are 128 fluid ounces in 1 gallon, the number of ounces collected equals the application rate in gallons per acre. This method works well for broadcast applications, banded applications and directed applications. The 1/128th method is described in NJAES Fact Sheet 1085, Sprayer Calibration.

Proper calibration can ensure the best possible control and can save you $.