Help me please! Every year about this time I vow NEVER again will I plant petunias or geraniums! But each spring their promise and beauty overtakes me. EVERY SUMMER I struggle with what I call 'budworms.' These pests are good at camouflage, eat from the inside-out of the blooms and simply destroy my pretty petunias and geraniums in late July and early August. I hand pick by finding their little 'poopie' droppings on lower leaves. Heartbreaking!
These worms laugh at the Bt spray I've used. No avail! My local Home Depot gardener informs me that Bt is no longer on the market and recommended Sevin spray instead (for reasons I can't disagree with...it's safer) Still no avail.
Here is a link that might be useful: