Article by Jack Bacheler.
Kudzu bugs generally have not become quite the terror that we expected at this point. Knock on wood. Although more soybean fields reached the 15 nymph per 15 sweep threshold this past week, widespread treatment has not been needed. We are now wondering about the intensity of this year’s major kudzu bug flights, but will also keep our fingers crossed for the next 2-3 weeks. In the Scotland County planting date/maturity group test, Dominic Reisig’s graduate student Alejandro reported this afternoon that late stage kudzu bug nymphs are now present in the April planted plots, early instars are present in the May planted plots, and very few adults or nymphs in the June planted “full season” and beans planted following wheat. Egg masses were beginning to show up on late planted beans, however. In all of the bifenthrin-protected plots, kudzu bug adults and nymphs levels were extremely low, irrespective of planting date or maturity group. In the untreated plots very few of the maturity group combinations had met the nymphal threshold. When sweeping for nymphs, remember that this sampling is probably most effective if done between approximately 11 am and 3 or 4 pm when the kudzu bug nymphs are more likely to be higher in the plants and within sweeping range.