Join Date: Feb 2004
Location: -40F area Minn.
They come and then they go, literally on the wind.
For about three years I had real problems now it is less and less every year.
Best control is to pick and squish right there, and I do mean right there.
Dust or liquid just does not work well enough and I have done both.
Poison kills good but but the Colorado Potato Beetles laugh at it.
A lot of Lady Bugs is the best mode to control or eradicate them.
I had a LOT, of LBs the year they peaked and one day I went out to squish the larvae and they were gone.
Squishing the larvae that hatch is most important if you want to stop them from coming back.
Some varieties of potatoes are immune to CP beetles , they will not eat them, but you have to look on-line for best info on that.
When I had them it was odd seeing one type of potato stripped and others untouched.
There once was a bio-fungicide that also controlled potato beetles but five or so years ago they banned it.
I do not think professional growers can get it any more either, as any info for it on-line is gone.