Leaves turning black on English Walnut Tree

7 years ago

I have a very large 100 year old walnut tree whose leaves are all slowly turning black. This started at the top of the tree this Spring and the whole tree is now infected. Does anybody know what the problem might be.

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Comments (6)

ken_adrian Adrian MI cold Z5
7 years ago
where are you.. can we see the whole tree ... ken
michaelbakerm
Original Author
7 years ago
Hi Ken, we are in Essex near Chelmsford. I attach a couple of additional photos.
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Thank you for posting the pics, it saved me time! I plan on transplanting the tree next week.
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If the tree is near enough to the sensitive plant for its leaves to fall on it, the growth can be stunted. For example I have three double file viburnum all planted at the same time 10 years ago. The one near a black walnut (although it is at least 10 feet outside its drip line) is sbout half the size of the other two. Good luck!
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It's a matter of semantics; I grew up calling them 'English' walnuts, and it's deeply ingrained in our culture and language, but they're not 'English' - J.regia is of Eurasian origin, and is more correctly called Persian or Carpathian walnut. Agreed, bob. The rootstock has no influence on the genetics of the seeds produced by the grafted scion variety. But, if there are black walnuts(or even hybrid seedlings) growing in the area, which may provide pollen to cross-pollenate the nutlet flowers on marystem's J.regia, then the resulting seedlings may be hybrids. In some areas of the country, 'Paradox' (J.regia X J.hindsii) seedlings are preferred as understocks for J.regia varieties.
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I live in Buffalo, NY there's been a few colder days with one or two being below freezing. My apple tree had a few similar spots, so I'll remove those just in case.
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kimmq
7 years ago
"Essex near Chelmsford" is most likely in the United Kingdom, England. What has your weather there been like? Wet? Dry? Warmer than normal? Colder than normal?

This might be a fungal disease or an environmental condition. Difficult to know without a lot more information.
michaelbakerm
Original Author
7 years ago
Ok. Sounds like you are in US. Thanks for the advice but I need a local expert
HU-108790210
4 years ago
last modified: 4 years ago
Hi there, I live in the US and my walnut tree looks exactly like yours. Did you figure out what was causing this damage? It would be really helpful for me right now. :) -Amy
Tomek Plewa
3 years ago
Draught, most likely. August 2020 was very dry over here, and the smaller of the two young trees was losing whole branches with leaves gradually turning black beginning from tips and edges. I will increase watering of the smaller tree and hope it saves the tree.

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Leaves turning black on English Walnut Tree

Comments (6)

ken_adrian Adrian MI cold Z5

michaelbakerm
Original Author

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Leaves turning black on English Walnut Tree

Comments (6)

ken_adrian Adrian MI cold Z5

michaelbakermOriginal Author

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kimmq

michaelbakermOriginal Author

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Tomek Plewa

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michaelbakerm
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michaelbakerm
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