Black walnut trees (Juglans nigra) produce a chemical called juglone in many parts of the tree, including the roots. In producing the chemical the tree is able to decrease growth of some plants around the tree (from the trunk outward to the drip line/edge of canopy). This would be an example of what type of competition?

Question

Quizplus · Accepted Answer

Interference competition occurs when one species directly interacts with and limits the growth or survival of another species. In this case, the black walnut tree is producing juglone which directly interferes with the growth of plants around it.

Black Walnut Trees (Juglans Nigra) Produce a Chemical Called Juglone