Rotting blooms on Dahlias
My dahlias have been blooming profusely all summer. They still have a lot of blossoms, but in the last few weeks the blossoms are rotting on the stem and not opening. Also the leaves have a whitish film and are somewhat shriveled. These are in pots that I over wintered in the basement. What might be causing these problems?
Is the white film removable?
Is there any fine webbing visible, especially on the underside of the leaves?
And most important, do you see anything moving when you examine the leaves closely - tiny black, white, or red insects?
Thank you for contacting Extension.