Mountain Ash:

 

 

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  • Broadleaf deciduous tree, 20-40 ft (6-12 m), spread 2/3's of this, upright oval in youth, gracefully open at maturity.  Leaves alternate, pinnately compound, 13-23 cm long, 9-15(19) leaflets, each 2-6.5 cm long, oblong to oblong-lanceolate, tip acute to obtuse, margin serrate but frequently entire in lower third,  Terminal buds, woolly, 13 mm long, lateral buds have several scales.  Fruit (6-9 mm diam.) yellow to red, in showy clusters.

 

  • Sun to part shade, prefers acid soils.  Does not do well in compacted soils and polluted atmospheres.  High summer temperatures appear to limit growth.

 

  • Hardy to USDA Zone (2) 3      Native range from Europe to western Asia and Siberia.  It one of the few introduced trees to become established in southern Alaska and grow in the wild (Viereck and Little, 1972).

 

  • Several cultivars are marketed, some may actually be hybrids; the more common ones include:
    • ‘Beissneri’  -  leaflets deeply toothed, originated in Germany about 1890.
    • ‘Black Hawk’  -  narrow tree, fruit large and orange, resists sun-scald, introduced in the 1960s.
    • Cardinal Royal™ ('Michred')  -  vigorous, upright habit, bright red fruit, developed at Michigan State Univ.
    • ‘Rossica’  -  uniform shape, bright red fruit, from Kiev, introduced about 1898. However, what is sold as ‘Rossica’ today is more likely ‘Rossica Major’ (Jacobson, 1996).

 

 

 

 

 

Common problems with Mountain Ash trees:

 

 

Insects:

 

Aphids      
 

 


Aphids feed by sucking up plant juices through a food channel in their beaks. At the same time, they inject saliva into the host. Light infestations are usually not harmful to plants, but higher infestations may result in leaf curl, wilting, stunting of shoot growth, and delay in production of flowers and fruit, as well as a general decline in plant vigor. Some aphids are also important vectors of plant diseases, transmitting pathogens in the feeding process.

A sticky glaze of honeydew may collect on lower leaves, outdoor furniture, cars, and other objects below aphid feeding sites. Honeydew coated objects soon become covered by one or more brown fungi known as sooty molds. Crusts of sooty mold are unsightly on man-made objects, and they can interfere with photosynthesis in leaves.

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Diseases:

 

     
   

 

 

    
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