Black knot is a fungus which attacks some fruit trees – both domestic and wild – and has occurred on the lovely Canadian cherry trees planted along many of the streets and avenues of our city.

Recently you published a letter from the Koochiching Men’s Garden Club concerning the spread of black knot disease in some types of ornamental and wild fruit trees, which is already a serious ...

2. If your plants are suffering from disease or damage. Above: Black knot on a plum tree. Photograph by Matt Borden via Flickr. In the winter, once the leaves have fallen, it’s easier to spot ...