I was working for the chicago park district this summer and I saw the cucumber beatles everywhere. I did notice a few things though. They seemed to only be active on hot dry days. I never really saw them on cold or rainy days. I also saw birds that were eating them off of some of the plants in the parks we took care of. The bugs only seem to be really attracted to yellow colored flowers or foliage. One of my managers said that using neem or a good insecticidal soap should take care of them.

I've had some success using Fermented Salmon Spray, probably regular fish emulsion would work as well. While the beetles weren't totally eliminated, their numbers have been significantly reduced to where I can handpick them in the mornings.

Pony!