My friend has citrus tree he waters the leaves and his tree have yellow leaves and dont look heathy. We live in BulLhead city arizona it gets very hot here in the summer

shortage of mineral in the soil
could be manganese, borax, or other items found in a citrus tree fertilizer
talk with a nursery showing them a few leaves

Magnesium deficiency more than likely

Treat your lemon tree like an Olympic athlete - feed well and regularly, hydrate well and keep diseases at bay. Trim out dead wood and if leaves are yellow, mix some Epsom salts into your citrus fertiliser. When you mulch, stay away from the base of the trunk - citrus are prone to collar rot.

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Fruit Tree Curly Leaf Treatment

Citrus Leaves Are Curling What Causes Citrus Leaf Curl

Leaf curl Wikipedia

short on a mineral in the soil
read google pages on citrus fruit problems
could be lack of iron or manganese mineral

very common to have borers
treat it as any other ornamental tree

try Yates Nature's Way Citrus & Ornamental Spray

white oil will help
you have to treat the soil and the tree

cut away and dump as many affected limbs as possible

dont leave dead or affected cuttings lying around in the soil or in the yard

Dwarf citrus trees are especially suited for container growing as they can be kept at manageable .... Yellowing leaves most often indicate lack of fertilizer or poor drainage.


Also look here - check their trouble shooting
Growing Citrus in Containers

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