Time to act:
Jun, Jul, Aug, Mar, Apr, May
The culprit is the flea beetle, which, like its namesake, jumps away when disturbed. The small, shiny, black, brown or blue beetles emerge in April and May, after winter hibernation, ready to start feeding. Eggs laid near host plants hatch in late-summer. The beetles feed for a few weeks before overwintering.
The upper leaves of brassicas and various ornamentals are riddled with holes. Seedlings may be wiped out. Swarms of tiny beetles, often shiny and black, hop away when disturbed.
Find it on
brassica seedlings, nasturtiums, alyssum, anemone, stocks, cleome, godetia