Answer: Six kinds of bugs can infest sunflowers: four-lined plant bugs, harlequin bugs, stink bugs, tarnished plant bugs, corn earworm and the larvae of the painted lady butterfly. There's also a sunflower maggot and a cucumber beetle that are occasional pests. I'm not sure which one is causing the damage - or why! You might try putting the sticky substance 'Tanglefoot' on the stem of one of your sunflowers to see if you can catch the critter doing the damage. Once it's identified, we can recommend a control. Good luck with your remaining sunflowers!
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