Rusts - Rose Rust

TYPE
 HOSTS
 DESCRIPTION

Rose Rust -
Phragmidium mucronatum


Baldo Villegas - sactorose@yahoo.com

 Rose. Orange spots are present on leaves. Spots on canes are orange, but become black in the fall and winter.


Baldo Villegas - sactorose@yahoo.com

  


 CONTROLS: Optimal temperatures for rust infections are 64-70° F and wet leaves for 2-4 hours.

Cultural: Irrigate early enough in the day so that plant surfaces have time to dry before the cooler temperatures of evening. Keep irrigation off of leaves and branches.

Prune plants for good air circulation. Prune out old canes in spring before temperatures reach 60-70ºF.

Plant resistant cultivars.

Biological Controls: Bacillus subtillus.
 
Mineral: Sulfur sprays can be effective if sprayed preventatively when rust infection periods occur. Also, Bordeaux mix when buds start to swell.
 
Missoula County Extension Office; Missoula, Montana 59808 - Updated for 2006