The Q&A Archives: looks like dry spit on my lemon tree leaves

Question: something new on lemon tree leaves I have not seen before. To describe what it looks like I would say like mucus dried clear on the leaves. It also causes them to curl, and get some browning. It is now at the outer leaves on the tree. The tree is loaded with new lemons. What is it, and what should I do?
Thanks in advance for your help.

Answer: What you describe sounds like the result of an insect infestation (Psyllids, thrips, aphids, etc.). These pests penetrate the leaf tissues and suck the fluids out. In the case of your lemon tree, some fluids continued to leak out and crust over even after the pests had moved on to other feeding grounds. You'll want to carefully inspect your tree, especially on the leaf undersides, to see if you can determine just which pest is causing the damage. Once you've identified it you can treat the tree with a registered insecticide. (Not all products are effective against all pests so I can't make a recommendation without knowing which pest you're dealing with.)

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