Camden Crop News: August 2022
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Collapse ▲Soybean Insect Management
Over the past few weeks I have captured corn earworm moths in the blacklight trap that I operate in Camden, with nightly catches picking up steam around the first of August. As moth catches increase in this local trap, the likelihood of moths flying into and laying eggs in your soybean fields increases as well. Trap data is published every Monday on the Camden Extension Center website under the Camden Crop Data tab on the left side of the page. Furthermore data from traps across the state will be reported on the NC State Extension Trap Data site.
Dr. Dominic Reisig has noted that corn earworm numbers have been extremely high in corn this year. While this is not a guarantee that they will be high in soybeans, we should definitely be scouting. Note that previous research does not support treating corn earworm in flowering soybeans. Therefore it’s important to hold off until pods are present to make a treatment decision.
Thresholds
-For foliage feeders (ex.soybean looper, green cloverworm, armyworms, and bean leaf beetle) the defoliation threshold is 30% defoliation up to two weeks prior to bloom, and 15% defoliation from two weeks prior to bloom until the pods have filled(R7-R8). Note that this includes a defoliation estimate throughout the entire canopy, not just the top visible leaves. Also, loopers tend to defoliate from the bottom up. See defoliation images below.
-Pod feeders(corn earworms and stink bugs) can be the most dangerous insect pests because they directly attack soybean yield, and management of these pests are critical once there are pods on the plant. The threshold for prompting action for stink bugs is 5 stink bugs per 15 sweeps of a sweep net for beans planted in 7-21 inch wide rows (with the exception of edible or seed soybeans being 2.5/15 sweeps). For corn earworms our threshold is based on our corn earworm economic threshold calculator, which utilizes information you input concerning control cost,soybean price, row width, and sampling method to develop tailored thresholds.
2022 NE AG Expo Wheat Trial Data
The results are in from our 2022 NE AG Expo Wheat Variety Trials. Trial results can be downloaded from the Camden County Website. Production information, as well as rainfall totals for each site, can be found on page two. Yields were ranked individually at each location, and were averaged across the locations to give an overall ranking. It’s important to note at the Currituck location that deer damage was observed on 4 varieties: AgriPro GP 348, Syngenta SY Viper, Pioneer 26R59, & Pioneer 26R45.
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.