Hocking County had a serious problem last growing season with Harlequin bug damage on crucifers. Any plant that was not monitored with hand picking or treated with insecticide was severely damaged up to complete loss of product. I have not seen this pest up in Columbus where I garden although I am sure it is on its way. It is normally a southern pest but has been moving north with the temperatures like all the rest of the bugs. When I did the garden walk at The Logan Community garden last year I noticed that all the brussel sprouts had been chewed to bits by this guy:
August 2016 pic
Scouting started in mid-May with the first bugs noted at The Urban Farm on June 13th.
Feeding damage from the bugs is noted on the leaf in the form of white stippling. Large holes were caused by feeding of Cabbage White larvae
Hand picking was used to remove the several bugs noted instead of insecticide to allow harvest of the remaining broccoli. The planting beds will be rotated out of broccoli within the next couple weeks and no other cruciferous vegetables will be planted until August, but scouting will continue.
In your gardens, especially if you have a long season brassica like brussel sprouts, you will need to do extensive hand picking as well as monitor for egg cases. Consider using an insecticide as well. More pics and treatment options in the links below.
Harlequin bug (Murgantia histrionica) –> Profile: Journal of Integrated Pest Management
Factsheet: University of Maryland