WSU Extension

Hortsense

Rose
 
Disease
Black mold 
Black spot 
Botrytis bud and twig blight 
Brand canker 
Bullheading (cold damage) 
Common canker 
Crown gall 
Downy mildew 
Powdery mildew 
Rust 
Viruses 
Insect
Leafcutting bees 
Leafrollers 
Redhumped caterpillar 
Root weevils 
Rose aphids 
Rose galls 
Rose leafhopper 
Rose midge 
Roseslug 
Spider mites 
Thrips 
Tobacco budworm 
Western spotted cucumber beetle 



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Rose : Black mold
(revision date: 4/23/2014)


Biology
Black mold primarily affects material used for propagation. The fungus grows on cut surfaces, such as at the contact points between rootstocks and scions and rootstocks and bud shields. This causes graft failures. A gray-white fungus growth is the first symptom of infection. This growth soon turns black as spores are produced. Certain rose varieties are extremely susceptible, such as R. chinensis var. manetti, while others rose varieties are resistant or immune.
Management Options


Non-Chemical Management
  • Keep all propagating areas and tools clean. Sanitation is very important in disease prevention.
  • Use only disease-free plant stock for planting and propagation.
  • Resistant or immune cultivars are available for understock. Rosa multiflora 'Ragged Robin' is an example of understock that is immune to this disease.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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