Davis recommends starting the season with acephate. If you need to make a second application, use either thiamethoxam and a pyrethroid or acephate and a pyrethroid, or a neonicotinoid and a pyrethroid. “If you need to make a third application, we recommend bifenthrin (Brigade, Discipline).”

Davis noted that producers can reduce the volume of material being sprayed on fields infested with stink bugs by going to site-specific applications. “We know stink bugs are aggregated along the borders of fields. If we can reduce the amount of insecticide applied by spraying only those edges, we can save the producers money, protect our natural enemies and hopefully reduce the amount of resistance building up to these various insecticide products.

“If you scout the field, scout more than just the field edges. Scout the entire field. You’ll find that there are some high densities and low densities. Growers will also find that the most damaged soybeans will be along the edges of fields.”

In 1-acre research plots, Louisiana scientists kept stink bugs from achieving threshold in the entire plot by spraying just four rows on either side of 40 rows or more. The field reached three stink bugs per 25 sweeps using this approach.

“We almost zeroed them out by spraying the entire field, but not completely, while our untreated check had almost 14 stink bugs per 25 sweeps. So spraying the edges of the fields worked in small plots. We sprayed only 25 percent of the acreage, so we were saving a lot of pesticide going out and we’re trying to maintain susceptibility to products we have.”

This year, Davis and his team will test the method on larger, grower fields.

Research also indicates that sections of research plots that recorded the highest level of stink bug infestations throughout the year also showed the highest level of green stem, which causes difficulty in combining soybeans. “We also had a lot of damaged soybeans, some secondary infections from fungi — just not very healthy looking soybeans.”

Samples from areas with the least amount of stink bugs, “showed brown stems, brown pods and brown leaves and nice looking soybeans.”

The threshold for southern green, greens and browns are 36 stink bugs per 100 sweeps while the threshold for the redbanded stink bug is 24 per 100 sweeps.

There is some confusion on how to distinguish the redbanded stink bug from the red shouldered stink bug, Davis noted. “The redbanded stink bug is shaped a little more like a football, while the red shouldered stink bug has more of a point to its tips. On the underside, the red shouldered stink bug looks more like a southern green or green stink bug, while the redbanded has a distinctive abdominal point.”