I have an eastern white pine 25 years old, black walnut beside it died and...

Asked May 10, 2014, 2:44 PM EDT

I have an eastern white pine 25 years old, black walnut beside it died and white pine looks bad. Some branches toward black walnut died. White pine Has green fungus on limbs, needles becoming sparse in areas. My 25 other coniferous trees, white pine , blue spruce and Norway spruce seem fine. These other 25 are in back area away from the "sick" ones. Thank you

Madison County Indiana black walnut tree juglone white pine

1 Response

I am not sure what killed your walnut, but eastern white pines are very sensitive to juglone, a chemical secreted by black walnut roots. The odds are your pine will not make it as the roots have probably grown in the same area as the walnut's. If any of your other pines are within 60 feet or so from the walnut they are in danger, but if the walnut is dead the roots have stopped growing so at least you won't have to worry about future damage. The juglone stays in the ground for a long time, so don't plant any sensitive plants in that area.

Here is more on black walnuts and juglone:
http://ohioline.osu.edu/hyg-fact/1000/1148.html
http://extension.psu.edu/plants/gardening/fact-sheets/trees-shrubs/landscaping-and-gardening-around-walnuts-and-other-juglone-producing-plants

Good luck!