Some cherry and plum trees in the central Ohio area are turning black from a fungal disease. Here's what you need to know.

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Spread of the disease The fungus which causes black knot overwinters in knots on twigs and branches and in the infected wood immediately surrounding the knots.

Black knot tree fungus is getting worse, according to the city's forestry expert.

An air-borne fungus called black knot is infecting thousands of trees in Calgary, and arborists say they are struggling to keep up.

Answer: It sounds like the tree has a fungal disease called black knot. It is a fungal canker of apricots, cherries and plums. The cankers look like charcoal wrapped on the branch. They enlarge ...

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Symptoms The black knot fungus attacks twigs and branches with infections starting on the youngest growth on the tree. Infected trees will have brown gall-like structures called knots enveloping ...

Black knot, caused by the fungus Apiosporina morbosa, has been identified in several cherry trees in Columbus. While the fungus primarily attacks cherry and plum trees, it can also infect apricots ...