Fact 1: The number of rings in a tree trunk can be used to estimate the age of the tree.

Fact 2: Tree age, scion, nutrition and other factors that affect the overall health of the tree could affect rootstock resistance or susceptibility to Phytophthora.

Given the two facts above, what can be checked along with nutrition and scion that can help determine health of a tree.?


 

 the number of rings         