Black Knot

Black Knot

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Credit: SCIMAT/SCIENCE PHOTO LIBRARY

Caption: Black Knot is a serious disease of plum trees. It is caused by the fungus, Dibotryon morbosum (also known as Apiosporina morbosa), which overwinters in knots on twigs and branches. In the spring, the fungus produces ascospores within tiny fruiting bodies on the surface of the knots. Wind spreads the ascospores for moderate distances. Those which land on green branches may germinate and cause infection if the twigs remain wet for a sufficient length of time. (Enhanced SEM, Microscope magnification 70x, image width: 1800 micrometers, bar: 200 micrometers)

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Keywords: apiosporina, apiosporina morbosa, ascospores, black knot, botany, dibotryon, dibotryon morbosum, disease, diseases, fungal infection, fungal infections, fungus, microscopy, morbosa, morbosum, nature, pathogens, pathology, plant, scanning electron micrograph, scanning electron microscopy, sem, sems, tree infection

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