Hi I have a lemon tree that is about 10 years old, variety is Eureka with thorns from the nursery (before this existed another lemon). But it has a problem, a lot of branches cannot develop new shoots and leaves and the old leaves are not green and are discolored as you will see in the photos. The basin of the tree is quite large (see photo) and I have two peppers and mint in it. I water the tree solidly, and have fertilized it in early April. Also I have sprayed several times with specific pesticide that makes for a lot of things. The temperatures in the area where I am (Cyprus) is between 34-38 degrees and 20-23 at night (can reach up to 44 degrees in August).What can be the problem?
1)The variety is not suitable for my area?(summer is really hot from 35 to 43 degrees celsius)
2)Could it be a disease?
Thanks. Do not forget to see the pictures