Camden Crop News: June 14th, 2022

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Northeast Ag Expo Summer Field Day: July 28th in Camden 

Save the Date. The Northeast Ag Expo Summer Field Day is set for Thursday, July 28 in Camden County at John E. Ferebee Farming, Inc., located at 350 Scotland Road, Camden, NC 27921. The field day will begin with a trade show, breakfast, and registration from 7:45  to 9:15 a.m., followed by opening remarks from 9:15 to 9:30 a.m., and field tours from 9:30 a.m. to 12:00 noon, and ending with a catered lunch. 

We have implemented a number of corn and soybean field trials on site aimed at efficiency and profitability of various treatments and strategies. Field trials include evaluating soybean planting date by maturity group by seeding rate, soybean fungicide timing and products, soybean fertilization, corn biologicals, corn nitrogen rate by plant population, corn population wheel, corn fertilization products, corn hybrid demonstration, corn plant population by row spacing, and more. 

Please Pre-Register by July 20th by calling the N.C. Cooperative Extension, Camden County Center at 252-331-7630 or online. 

Scout and Manage Stink Bugs in Pre-Tassel Corn

With corn shooting up, some fields are not too far away from tasseling. It is critical to scout corn when the primary ear is growing and to protect it during the two weeks prior to tasseling (growth stages V14-VT).

Scouting: Check all edges first (especially sources like woods, weeds and other crops), since they concentrate toward edges and not field middles. The number of sampling stops will depend on the number of stink bugs present and field size. At each sampling stop, check at least 10 corn plants. Sampling the entire plant is not necessary. From V14 to VT, find where the primary ear is located or peel back leaves to find where it is forming and scout the stalk from the first leaf above and below the primary ear. From R1 to R2, scout the stalk at one leaf above and two leaves below the primary ear.

A hand handling corn stalkA hand holding immature corn.

Thresholds:  Thresholds vary depending on growth stage and are based on a 100 plant sample as described below (see table below). These thresholds are not percentages, but numbers. If a single plant has multiple stink bugs, this must be counted into the total. If the number of stink bugs exceeds the number in the “treat” category, treat the field even if 100 plants have not been sampled. If the number of stink bugs per plant falls between the “treat” and “do not treat” category, take more samples until a confident decision can be made. 

A table of growth stages and sample areas.

Insecticide Control: Many insecticides in the pyrethroid class are effective for brown stink bug in corn. However, bifenthrin is the most effective both because it can be applied at a rate that contains more active ingredient than other pyrethroids and because it is more toxic to brown stink bugs. Expect only a week’s residual. 

Two critical factors to achieve control are: 

  1. Coverage- deliver insecticide where the stink bugs are located (photo below). Ensure canopy penetration with proper nozzle, pressure and volume selection.
  2. Timing- the most critical time to treat from V14 to VT is just before the primary ear is exposed. Aim to control stink bugs when the primary ear is between these stages, but preferably on the early side to avoid banana ear.Insects on corn leaves.

    For more information regarding any of your farming needs, please feel free to contact me at the Camden County Cooperative Extension Office: 252-331-7630.