Is there a way of neutralizing the effects of Juglone in soil. I have several Black walnut trees in my yard and cant seem to get anything else to grow (grass or veggies). I hate to take down a living tree, but this has been very frustrating!
Some plants are very tolerant and other very susceptible. Several university sites have list. Unfortunately, they aren't complete but still helpful. If you have many mature trees, the shade and competition from the roots could be a problem even with resistant plants. I would seriously consider removing one tree at least. I like diversity. The Juglone in the roots will still be a problem for a while.
That's very interesting information about the juglone not being quite as bad as some people think. I've got young walnuts within about 40' or 50'feet of my best young apple, so I'm hoping that will be enough. I did plant a redbud in between to block the roots.
Hey permies, After reading some posts on the subject of juglone effects on many plants...and reading that mycelia might help, I found this article. Seems mycelia may enhance the travels of juglone. Am I reading this wrong?
Allelopathy is a biological phenomenon where plants have harmful effects on growth of surrounding plants through the production of chemical substances. Here we focus on allelochemical processes which operate belowground, can influence plant interactions and therefore potentially affect plant community structure. Soil hyphae of arbuscular mycorrhizal fungi (AMF) may enhance transport processes in the soil matrix by providing direct connections between plants facilitating infochemical exchange.
In a two-component field study we showed that soil hyphae likely play a crucial role in movement of allelochemicals in natural soils and greatly expand bioactive zones by providing effective transport pathways for chemical compounds. First, we tested the effects of Juglans regia leaf litter extract addition in intact or disrupted hyphal networks and simultaneously determined growth reducing effects on sensitive Lycopersicon lycopersicum plants. Second, we analyzed the effect of juglone on tomato by directly adding leaf litter. In both approaches we found an increase of juglone transport if a hyphal network was present, resulting in reduced growth of target plants.
Our results, together with previous work, add to the body of evidence for hyphae of soil fungi playing an important role in the transfer of allelochemicals and effectively acting as transport highways in the field. We suggest that hyphal connections, mostly formed by AMF, increase the effectiveness of allelochemicals in natural systems and can play a crucial role in chemical interaction processes in the soil.
A few years ago I mistakenly transplanted a beautiful Dexter rhododendron too close to a black walnut. It is showing stress and it will take a couple of men to move it again. Will the juglone continue to poison the large bush even when I move it?