I have red ants climbing my lemon tree.

Question

The reddish ants leaving “spikes” on the leaves. Then leaves become brown and die. My zone 10 lemon tree looks awful.

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Answer 1

The ants are probably eating honeydew, which is the residue from another pest.
Treat the plant with Neem Oil; Neem Oil is organic and safe for people and bees.
These articles will help you.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/pests-of-lemon-trees.htm