By Top Crop Manager
July 27, 2015 - With the exception of the last few hot days, these slightly cooler than norm July temps are ideal for soybean aphid development. They can double their populations in a matter of days when temperatures are moderate. There haven’t been many reports of threshold levels being found in the fields so I am a little worried that not everyone is taking the time to check their fields.
It is important to scout soybeans every seven to 10 days until populations are found and then more frequently (every three to four days) as aphid populations approach the threshold. Look at 20–30 random plants across the field. Avoid field edges. Estimate the number of aphids per plant and the abundance of natural enemies present. A minimum of two field visits is required to confirm that aphid populations are increasing.