True or False: Devrinol 50-DF is effective in controlling both germinating and established weeds in ornamentals.

Devrinol 50-DF is primarily a pre-emergent herbicide, meaning its effectiveness lies mainly in preventing the germination of weed seeds rather than controlling already established weeds. When applied to the soil, it creates a barrier that stops weed seeds from sprouting, making it useful for managing weeds by targeting their germination stage. However, it does not have significant activity against established weeds, which require different types of herbicides for effective control. This characteristic is what makes the statement false—Devrinol is not effective in controlling both germinating and established weeds in ornamentals. Its application strategy revolves around managing germination rather than dealing with weeds that have already taken hold.