It's important to prune the tree carefully so that no crossover branches remain.
If you have an old or neglected Czar plum tree then more information about pruning these trees can be found here.
PESTS, DISEASES OF CZAR PLUM TREES Czar plum trees are susceptible to all the pests and diseases of which attack plum trees and for a comprehensive list of symptoms and cures see our plum tree pest and disease page.
It is unfortunate however that Czar does have a reputation, and. Pruning Regular pruning required according to tree form Pests Can get aphids, caterpillars, fruit tree red spider mite, brown scale, plum moth and bullfinches Diseases May be affected by silver leaf, bacterial canker, blossom wilt and fruit by brown rot.