Ask a Question forum: Dwarf Lemon Tree

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Name: Moe Q
Southern California
Aug 16, 2016 7:58 AM CST
I have a dwarf eureka tree. I noticed the leaves were turning yellow and had a white spot on the leaves that showed to the other side. I did some research and was thinking its a mineral deficiency plus mites but not sure. I'm in southern California. Can you please analyze the photos and let me know your thoughts. Thank you!
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Name: Daisy
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Aug 16, 2016 10:33 AM CST
Hi Moe, Welcome! to NGA

I can see three problems:

It looks like it needs some fertilizer. Are you using Citrus Food? Citrus are heavy feeders and need fertilizing several times each year.

The branches at the base with the 3-part leaves are from the root stock. Allowing those to grow will eventually kill the grafted tree.

It looks like you have the beginnings of something. Is this tree is the shade? Could be mildew.
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
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Aug 16, 2016 9:26 PM CST
Agree with Daisy on all three points. Plus it does look like you might have some mites. Easy to tell for sure, just run your finger firmly across the underside of a leaf - choose one that looks mottled in color. If it comes away slightly yellowish or orange, there were mites under there. A thorough spraying with the hose, including hitting the undersides of the leaves will often take care of them. A spray with soapy water is another option, and you will need to do either treatment at least twice within a week to get all the generations of mites. Don't make the soap solution too strong - about 1/2tsp. per quart of water is plenty and rinse the soap off when you've sprayed the whole plant thoroughly.

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Sue
Ontario, Canada (Zone 4a)
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Aug 17, 2016 5:59 AM CST
I would defer to Daisy and Elaine since they're more familiar with citrus, but is it possible that white spot could be some insect chewing, since the spot is somewhat translucent and you can see through it? I wondered about citrus leafminer but that doesn't seem to be a blotch leafminer except maybe when it first starts.

I thiught when I looked at it that the plant might have magnesium deficiency and it matches the symptoms on citrus except that the leaf tips are not still green, so not likely that:

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