Pacific Northwest Plant Disease Management Handbook

Kalmia (Mountain Laurel)-Petal Blight

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Latest revision: 
March 2024

Senescent flowers are more likely to develop the gray sporulation of Botrytis.

Jay W. Pscheidt, 2020.

Humid wet conditions encourage development of Botrytis on petals and spent flowers.

Jay W. Pscheidt, 2020.

See:

Azalea (Rhododendron spp.) - Botrytis Petal Blight

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2024 Pacific Northwest Plant Disease Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.

H - Home garden packaging commonly available.     O - Acceptable in organic production.