I have hundreds of cannas and this year the amount of leaf rollers was unreal! I really don't want to spray chemicals, so could somebody who used BT please tell me if it works, how it works best and is it really safe.

I have tons of tiny caterpillars in my pool this year, too. I could not identify them, but does the leaf roller become a caterpillar at any time? They are brown/black about an inch long and curl up when you touch them. They can't swim :-)

Thanks