Sara from FarmingFriends has had this comment on her website about black substance on bay leaves & asked if TopVeg could help.
“I have two standard bay trees in pots and have kept them like this for three years. Recently, I have noticed a black substance on the leaves which washes off with just plain water but keeps coming back! Do you have any idea what this is? Or what I can do to prevent this reoccuring? Mia”
Malcolm Allison, our plant consultant, has answered:
“This would be a result of aphid infestation ~ the aphids secrete honeydew which provides a substrate & nutrition for the black mould. I’d recommend spraying the aphids with soapy water (or water with a bit of washing up liquid in it), hopefully this should deal with the problem.”
This has been a bad year for aphids – they like it hot and dry. So it is not surprising to find some bay leaves with black mould.
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