FLOWERING CRABAPPLE (Malus sp.) SELECTION CRITERIA

 

  1. DISEASE RESISTANCE
    • CEDAR APPLE RUST (FUNGAL)
    • SCAB (FUNGAL)
    • FIREBLIGHT (BACTERIAL)
    • POWDERY MILDEW


    RECENT LISTS DEVELOPED FOR JAPANESE BEETLE RESISTANCE


  2. FLOWERS
    • BLOOM DATE
    • COLOR


  3. FRUIT
    • SIZE
    • COLOR
    • PERSISTENCE


  4. TREE FORM AND SIZE


  5. FOLIAGE
    • COLOR (growing season and in fall)


  6. WATER SPROUTS AND SUCKERS


    SCAN DIRR'S TREATMENT OF MALUS (PAGE 630 -632)

 

CRATAEGUS DISEASES

 

  • RUSTS (SEVEAL SP OF FUNGI; CEDAR QUINCE RUST)
  • SCAB (FUNGUS)
  • FIREBLIGHT (BACTERIA)
  • HAWTHORN LEAF BLIGHT (FUNGUS) MOSTLY ON C. laevigata