We now have several screening trials in-process or completed for kudzu bug in North Carolina soybeans. One test, performed by Jack Bacheler, was in the Piedmont (Randolph County), while two tests, one performed by Dominic Reisig and one by Jack Bacheler, were in the Coastal Plain (Greene County). In general our results align with those from Georgia and South Carolina. Pyrethroids and pre-mix products containing pyrethroids are very effective. Remember to stay away from anything with cyfluthrin. Some of these products look good at reduced rates.
These products had good knockdown measured at three days after treatment. The population densities were just above threshold (one nymph per sweep).
Products held until a week after treatment.
Pyrethroids and pre-mix products containing pyrethroids worked well. Belay and Orthene had decent knockdown, but densities were still near the threshold of one nymph per sweep.
Results were similar to three days after treatment, although population densities in Orthene treatments decreased.
Knockdown was good with the synthetic pyrethroids and pre-mixes with pyrethroids. Slightly reduced rates of Endigo and bifenthrin were also effective at these population levels. Remember that the threshold is one nymph per sweep.
Products that were effective three days after treatment held to seven days after treatment. Although initial knockdown was poor with Belay, it was moderately effective at a week after treatment (78% control compared to the check).