i have always loved the fine white powder that dusts the reddish purple canes of black raspberries in the winter. i have just spent a half hour or so trying to find out what that powder is, and why it seems to cover black raspberries and not traditional red raspberries (although i don’t know if this is an anecdotal observation or a scientific fact). in any case, i have come across an infinite number of online references to powdery mildew, but not a single reference to this phenomenon, affecting, as far as i can tell, perfectly health plants. i haven’t asked for help from the naturalist wing of my still blog family in a while, but i’m dying to know the answer. anyone?
raspberry canes in november
grass lake regional trail, saint paul, minnesota
En français, on appelle cela ”la pruine”, signe de fraîcheur sur le raisin, les prunes… je ne sais si cela peut aider…
On apples in English it’s called the blush but I can’t help with Why or why not. Beautiful composition-
oops- I’m sure I meant- ‘it’s called the BLOOM’. That would give your research a springboard. sorry about that!
Je serai assez du même avis qu’Akä, de la pruine ! https://en.wikipedia.org/wiki/Pruinescence
Peut-être que c’est cela
Our black raspberries have the same (in Tennessee) though our weather is (blessedly!) different from yours.