Citrus > Citrus General Discussion

Yuzu Leaf Diagnosis - Hypopigmentation?

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incubator01:
the back of that leaf certainly has a lot of dark dots, if it's not dirt, it could be bugs? (mites, aphids?)
Try spraying the back of those leaves with water so they're clean and see if it gets worse or the spots come back. If so you may need some neem oil based product.

Indoors many plants get insects because it's a lot warmer there, I had armored scale in january once on a kaffir lime, it was terrible :( there was a whole colony on every branch.

flos:
Hello together,
i got the same spots on my clemyuz22 and where unable to find a real diagnosis.
I found some article in the citrusindustry-newsletter. Herbizid-damage looks a bit similar to our "disease".

Could this be possible?

https://citrusindustry.net/2021/11/08/impacts-of-herbicides-on-young-citrus-trees/?fbclid=IwAR3gEVwe63B7E644v91SwgR8XWgx97mCKAVEUZYTfVK-zo_FeId68yy0Ap0

brian:
two of my in-ground, in-greenhouse trees have this same issue.  One is a Xie Shan satsuma, the other is a Valentine Pummelo.  the Valentine Pummelo has had a recurring red spider mite infestation, but the Xie Shan despite being right next to it, hasn't had an obvious mite problem.  I spray both when treating, though.  These two trees are located right next to each other in an area of my greenhouse that sometimes has standing water when it rains heavily outside, because inside the greenhouse it is actually below grade relative to the outside.  I suspect that flooding is the root cause of this for me, and the spider mites are exacerbating it.

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