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Negative Allelopathy

 
Jeffrey Hodgins
Posts: 166
Location: Yucatan Puebla Ontario BC
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Please try to limit your comments to mostly relevant data.

Walnut:
More than 35 phenolic compounds have been identified in walnuts, and more than 12 compounds just in the green
fruit husk. Many of these materials have been cited as expressing allelopathic symptoms in plants and
microorganisms. These compounds tend to peak in concentration early in the growing season after full
leaf expansion because of their role in new tissue protection. Several of the identified phenolic compounds of walnuts have been shown to generate allelopathic impacts on surrounding plants. By far the largest concentration (and one of the most toxic), usually present at >20 times more than all the other of these
allelopathic materials in walnut, is juglone

Main allelopathic compound: Juglone

Plants mostly effected: Broad leaf plants.

More tolorant plants: grasses, Black berries, May apple

Note: The wild Blackberries in Ontario benefit from the relationship most likely due to reduced competition
 
Ben Walter
Posts: 92
Location: Deland, FL
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This link has a list of tolerant and susceptible plants to Juglone

http://pubs.ext.vt.edu/430/430-021/430-021.html

Here's a list of other possible negative allelopathic trees

http://warnell.forestry.uga.edu/service/library/for99-003/for99-003.pdf
 
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