Hi I have these beetles that look a lot like cucumber beetles all over my Swiss chard (and not nearby cucumber plants) The plants also have large holes in leaves but this doesn’t look like normal beetle damage. Any ideas on the identification of the beetles, if they are causing he damage and if not what might be, and how to prevent Thanks Clare
Baltimore County Maryland
Hi- this is the pigweed flea beetle. Swiss chard is in the Amaranth family and a host for this insect. It chews larger holes than some of the smaller flea beetles common in food crops.
In the future, try using a floating row cover to exclude this pest. You could spray with pyrethrins, neem products, or spinsosad to control it at this point.