we have the wild variety of lambs ears that take 2 years to bloom, and have the long stalk of yellow flowers. we've had quite a crop this year on our fence lines, but they have been attacked by a flower eating something, that lives on the stalk and devours the center of the plant and the flower's. it has a webing and the affected areas just disintegrate. any help will be appreciated..

Perhaps butterfly larvae. Painted Lady butterflies love folliage that is white and downy

Sounds like you are talking about Verbascum thapsus, plant.