Rating Inoculations at Long Branch Orchard No. 1

November 11, 2006

On November 11, 2006, Dr. Fred Hebard of the American Chestnut Foundation assisted a Carolinas team led by Dr. Paul Sisco in rating the reaction of back crossed chestnut trees in Long Branch Orchard No. 1 to chestnut bark fungus implanted in the trees in July, 2006.  The team members performed the rating of the inoculations.

The results were rated from 1 to 5 based on the relative size of the affected area where the tree was inoculated at the base with an aggressive form of the chestnut bark fungus coupled with the relative size of the affected area higher on the tree where it was inoculated with a less aggressive form of the fungus. A rating of 1 indicates strong resistance to both forms of the fungus. A rating of 5 indicates that the tree is very susceptible to the chestnut bark fungus.  Trees susceptible to the chestnut bark fungus under the bark have visible areas on the trunk like a sunken area around the inoculation point.

The November 2006 ratings are an initial check and will be followed by a second set of ratings in the late spring/summer of 2007. The second set of ratings will indicate which trees in the orchard will be saved for further back crossing and which trees will be culled from the orchard.  Ratings for individual trees in the orchard are recorded on a diagram of the orchard and recorded on an electronic version to facilitate further analysis.