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Managing black knot

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Managing black knot
Now is a good time to prune out all the knot-bearing branches on
cherry, apricot, or plum trees infected with black knot.

Now is a good time to prune out all the knot-bearing branches on cherry, apricot, or plum trees infected with black knot.

Black, tar-like swellings on branches of infected plants are the most obvious signs of black knot, though initially a small, olive-green gall forms.

Black knot is widespread in commercial, municipal, private, and natural plantings in Alberta. The disease reduces the aesthetic value of affected specimens, as infections spread rapidly. High levels of infection may result in the eventual death of the plant.

For more information, visit here: http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/faq7622.