Basswood, or known as the American Linden, trees are very healthy trees in most cases. They tend to live a long healthy life because most of the diseases that harm them are aesthetic. They only cause leaf damage in most cases. They do have some diseases that rot their trunk that cause for them to be a target in heavy winds but for the most part they are a tree that is recommended to be planted in residential yards.
Basswood trees are very hardy trees and are fairly maintenance free. There root system is not a tap root style so they can blow down in winds but rarely do because they are not as full of a tree.
Common well known pests of this tree are gypsy moths, verticillium wilt, anthracnose, leafrollers, aphids, and galls are some of the diseases that Basswood trees can get. Here are some things to look for
Spots on leaves
Leaf die back in areas
Galls on Leaves (bumps sticking out of leaves) Pictured to right