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Black powdery stuff on tree leaves #463776

Asked June 19, 2018, 9:22 PM EDT

Hello, I planted a Pineapple Guava (Acca sellowiana) tree in my yard a month ago. It did not have any labels on it so I'm not sure what variety of pineapple guava tree it is. The tree is about 4 ft tall and was extremely root bound. I noticed there was black powdery stuff on 3 or 4 of the leaves that rubs off easily. I'm not sure if the black stuff was already on it from the nursery or if it just started after I planted it. Can you tell me what it is and how to take care of it. Thank you for your assistance! -Grace 

Linn County Oregon

Expert Response

Thanks for your question about black material on your guava leaves. Is there any sign of insects on those leaves of adjacent ones, or stickyness from insect honeydew? If not, and if the material rubs off and there is no damage underneath, and it is only on 3 or 4 leaves, then it may be just a superficial material. On the other hand, if it is spreading or is damaging the leaves, it could be a problem. Diagnosing it may be tricky, as your plant is not a common one here.
By the way, being root bound is likely to be a bigger problem. Are you familiar with the methods to open out a root mass before planting?
Signe Danler, Online Home Horticulture Instructor Replied June 22, 2018, 8:55 PM EDT
Thank you very much to your response.  I didn't see any sign of insects or stickiness on the tree.  I did find it on one more leaf but all the others look great.  Hopefully it will be OK. 

I am fairly new to gardening.  I did watch a few videos on how to plant a root bound tree and I tried to follow the instructions as best as I could.  I grew up with these trees and eating the fruits and I just love it.  I was pleasantly surprised to see these trees growing outside the old Costco in Medford and a very large one at the Portland Rose Garden.  So I hope I can make it thrive here.  
The Question Asker Replied June 22, 2018, 10:35 PM EDT
Good luck with your tree! Medford is warm enough, I am no surprised they can thrive there. If you have any further problems, feel free to contact us again.
Signe Danler, Online Home Horticulture Instructor Replied June 26, 2018, 11:48 AM EDT

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