Stink bugs and corn pests

Posted: July 14, 2011

Brown marmormated stink bugs and European corn borers are starting a second generation. Corn earworm is present.
Corn earworm larvae

Corn earworm larvae

Brown marmorated stink bug alert

Brown marmorated stink bugs overwinter as adults, lay 250-400 eggs per female, develop through a series of nymphal instars, and then emerge at much higher densities as 2nd generation adults that also lay eggs.

Second generation adults have started to emerge in Virginia. Reports of damage to tree fruit has been occurring from both 1st and 2nd generation, but this week there have been reports of damage to cucurbits from the northern portion of West Virginia. Warm weather will have accelerated this development, and we have not yet seen 2nd generation in Pennsylvania, but it will arrive soon. Growers should start scouting for Brown marmorated stink bug. Look for adults especially on buds and fruits, and for egg masses or hatching nymphs on the underside of leaves. Until we learn more, we should consider all crops as potential hosts.

Sweet corn insects

Welcome to PestWatch, on July 6, 2011. Mapped output is at the PestWatch website.

Corn earworm

Corn earworm captures continue to be sporadic. Recent and current counts suggesting wider (5-6 day) spray intervals showed up in Blair, Centre, Lancaster, and Montgomery counties. History suggests that hot, dry weather in the southeast increases risk of earworm migration.  Although many areas are below threshold, and it is spotty and early in the season to consistently control for earworm, we do have risk of earworm damage scattered throughout the state.  Most recent captures suggest 5-6 day spray intervals should be sufficient.

European corn borer

Second generation European corn borer started to appear in Bucks, Centre and Dauphin counties, at levels that also suggest 5-6 day spray intervals.

Fall armyworm

Fall armyworms reports are low to absent.


In summary, corn earworm captures are spotty but low, and second generation corn borer is starting. Risk from both species is spotty. Five to six day spray intervals should be sufficient. Be prepared for influxes of earworms and second generation corn borer.