Lemon Tree leaves spotting up

KHershey(5)July 29, 2014

Hi everyone,
I'm hoping some of the very knowledgeable folks on here can help me. I got a meyers lemon tree in February from Amazon as a gift. I potted it up, and for the last 6 months it seemed to be doing very well. It went from one little twig to a branched out shrub shape- lots of new growth and it's flowered a couple times. :) I'm currently letting two lemons grow on the older branches (they're a little bigger than a golf ball and still green). I love my tree and have been so happy with its progress!
Recently though, I noticed a few yellowish looking spots on the tops of the leaves. They look like transparent spots in the leaves because they only show up when the sun is shining through the tree branches. On the bottom side of the leaves are tiny little bumps in the leaf surface that seem to correspond with the yellow spots on top. They've spread to almost every leaf, and I don't know what to do. :( Please, can someone help me before more damage happens?
Here's the pertinent info:
-My tree is in a ceramic pot with Miracle Gro Cactus soil mix.
-It's in a south facing window with an east facing window next to it, and a grow bulb above it.
-I water it once every 7-10 days when the soil dries out.
-I use DynaGro Foliage Pro fertilizer each watering per the instructions on the package.
-In between watering I mist the leaves to keep the humidity levels up..
-I can't find any evidence of pest damage (other than the spots on the leaves).
What am I doing wrong for my poor tree?! Can someone please help?

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Here's a photo of the bottom of the leaves, since the upload only allows for one at a time.

    Bookmark   July 29, 2014 at 3:16PM
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Here's my tree's set-up just in case...

    Bookmark   July 29, 2014 at 3:18PM
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Looks like you have a case of spider mites. If you have a 10x loupe, you can see them; if you don't have a 10x loupe, buy one; a lot of the critters that attack citrus can't be seen by the naked eye.
You can find lots of discussion on this forum about treatment of spider mites.

    Bookmark   July 29, 2014 at 5:28PM
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Thanks, Johnmerr!
I didn't know I needed to be on the lookout for INvisible pests as well as the visible ones. :) I'll be sure to get that loupe.
I found a thread that gave great reviews for a mix of Neem oil, Rosemary oil, and DynaGro Pro-tek for taking care of spider mites. I'm going to give that a try. Thanks so much for your help!

    Bookmark   July 30, 2014 at 10:29AM
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