How do you try to control them,
dust, spray, systematic insecticide?
This year I used Power Force
mfgd. by Bayer. It killed and left a residual effect that continued for
7-10 days. In addition, I sprinkled NoLo Bait around and will do some
more before fall. I'm not happy about using the Bayer spray. It
kills a number of beneficial insects as well as the grasshoppers.
Praying Mantis and ladybugs both took a hit using it. I didn't use it
everywhere. Mainly I tried to control them on the seedlings and the
spurias, but early on when they were at their worst I used it on everything
once. After that I hoped it would get more in balance. It
did. I know the plants look bad, but what you see is normal every year
here. It's a credit to the inherent toughness of iris that they will
come back and bloom next spring. I'm sure the bloom would be even better
if they didn't have to suffer through our summer months - provided we could
skip the fractious spring weather. Sometimes we luck out in the spring,
but summer is almost a sure thing.