A master gardener here, BUT, don't know very much First, where are you located--that could have a big impact on what's happening. Looks like it might be leafhoppers, BUT a bit early in most of the country for them critters. Are they in pots or in the ground IF they are in pots, could be the soil needs leaching from accumulated salts. Other than that, have no clues. Don't overwater and don't over fertilize--whatever you do, especially if it's early in the season for you. That's about all I can add.