secrete juglone from their roots and juglone also leaches out of the fruits.
Juglone is especially a problem in areas where drainage is poor
juglone can accumulate in the dirt to high concentrations. Juglone is
carried along with water and is in the dirt. Of course, black walnut trees
are not injured by their own juglone!
plants produce large amounts of the plant hormone methyl
. Methyl jasmonate is airborne
. The large amounts of methyl
jasmonate produced by sagebrush plants seems to inhibit the growth of
, although the exact mechanism of this action is not yet