We have a cottage in a very close proximity to the Black Sea (around 2 kilometers) in what is referred to as a Temperate Climate Zone environment. We have 3 old walnut trees that give a fair amount of walnuts each year. However, most of them get black and fall out from the tree prematurely. According to my grandmother, in the past, there was no such problem with the walnuts. However, with each year, more and more nuts get spoiled. The trees are very huge and it would be very hard to spray them with bordeaux spray or anything else. Has anyone else experienced such problem with walnut trees and are there some more "natural" ways to handle this?

  • pictures please!
    – kevinskio
    Nov 15, 2021 at 12:34
  • When you say that the nuts are black, do you mean the outer skins, the nuts inside the skins, or both? Are there any small white worms inside the nuts?
    – Jurp
    Nov 15, 2021 at 13:24
  • @Jurp, during summertime the outer green shell starts getting black and in most cases it also spoils the nut inside. So, by the time the nut should be ready, the green shell becomes fully black and dries out around the nut. When you crack it open, the nut inside is rancid and inedible (or in some rare cases it is fully missing).
    – Badan
    Nov 15, 2021 at 14:55


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