These resources are brought to you by the Cooperative Extension System and your Local Institution
eXtension is an interactive learning environment delivering the best, most researched knowledge from the smartest land-grant university minds across America.
eXtension: more mind reachHave a question? Try asking one of our Experts
Last Updated: August 22, 2011
Black pox is a fungus disease caused by Helminthosporium papulosum. It is considered to be of minor economic importance. When it occurs, the disease can affect apple bark, fruit, and foliage. It is more common from southern Virginia southward than in the northern mid-Atlantic region. The same fungus causes blister canker on pear. For more information, read this article on Black Pox of Apple.
Answer provided by Alan R. Biggs, West Virginia University.
Unlike most other resources on the web, we have experts from Universities around the country ready to answer your questions.
This resource area was created by the: Apples community
All about understanding and choosing the right rootstock
Apple Cultivars (in the works)
Characteristics, descriptions, and how to choose the best to grow and eat
Buying and planting trees
Managing Apple Trees and Orchards
Insects, diseases, wildlife and other challenges
Propagating Apple Rootstocks and Trees
Grafting, budding, tissue culture, and all about how rootstocks are developed
