Extension > Garden > Diagnose a problem > What's wrong with my plant? > Annuals and Perennials > Phlox > Spots on leaves
Phlox > Spots on leaves
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Powdery Mildew
Erysiphe cichoracearum
- Powdery, fluffy white spots and blothces on leaves, stems, and flower parts
- Tiny black round spheres may be visible within white spots late in the season
- Spots typically start on lower leaves but can spread to cover the entire plant
- Severely infected leaves may be completely covered in white or grayish white fungi
- In some cases, leaves become curled or twisted or turn yellow due to the infection
- More information on Powdery Mildew
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Fourlined plant bug
- Occurs May to early July
- Feeding causes brownish or sunken spot on leaves
- Nymphs are red or red and black; Adults are greenish yellow with 4 black stripes, 1/4 to 1/3 inch long
- More information on Fourlined plant bug
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Leaf Spot
Ascochyta phlogis var. phlogina
- Brown round to irregular spots with a purple border on leaves
- Spots start out small, but can grow to kill large sections of the leaf
- Spots typically start on lower leaves but can spread to cover the entire plant
