Phlox Flower Diseases. When these spots merge they can nearly obliterate any remaining green tissue moving onto the flowers as well. The stem at the base turns brown becomes loose corks cracks leaves at the bottom turn yellow and dry the stem breaks off easily.
Therefore it is advisable to just buy phlox planted separately in quarantine. It attacks primarily the lower leaves producing dark brown circular spots up to one-fourth inch in diameter the centers of which are light gray almost white. To avoid powdery mildew or to correct this issue make sure that plants are giving sufficient space to grow.
Crown rot causes the most damage on young plants often turning the foliage into a.
If left unchecked the disease will destroy any green part of the plant before destroying the flower. To avoid powdery mildew or to correct this issue make sure that plants are giving sufficient space to grow. Badly infected lower leaves become discolored and distorted then dropoff. In the initial stages of the disease phlox may be hidden.