Among most of gardeners it is almost unacceptable to use rough materials, sharp knives or saws which earlier without special problems all summer residents used. Anyway, how to carry out this procedure, to solve only to you, but the main thing to remember that any work with bark of a tree has to be the accuratest and scrupulous!
In places where there are cracks or mechanical deepenings, it is necessary to use a wooden knife.
It, probably, the most difficult stage in a type of that the gardener should choose not only mixes for whitewashing, but also tools, and also to decide on height of the performed work. The general health of all plant depends on these features.
Treat the first: solution of a copper vitriol, bordeaux mix, preparations H, Oksikh and others. Such components are concentrated and their application has to be the most careful.