WSU Extension

Hortsense

Kinnikinnick
 
Disease
Leaf gall 
Leaf spot 
Rust 
Insect
Aphid (Manzanita leafgall aphid) 



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Caption: Kinnikinnick leaf spot
Photo by: R.S. Byther
  
Kinnikinnick : Leaf spot
(revision date: 4/23/2014)


Biology
Leaf spot is a fungal disease. Symptoms include development of brown, necrotic spots on leaves. The fungus most likely overwinters on infected leaves and possibly on twigs. The disease is favored by cool, wet conditions and is spread by splashing water.
Management Options


Non-Chemical Management
  • Rake and destroy fallen leaves.
  • Remove and destroy infected leaves from plants, where practical.
  • Avoid overhead irrigation.
  • Space plantings and prune to improve air circulation. Avoid planting in moist, shady areas if leaf spot is a problem.
  • The variety 'Massachusetts' is reported to be resistant to leaf spot.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Kinnikinnick leaf spot
Photo by: R.S. Byther