Hi, How to increase the leaves in Guava fruit tree. Best wishes.
Certified GKH Gardening Expert
This is usually caused by a lack of nitrogen in the soil. Adding this can help vegetative leaf growth in your tree.
Alternatively, the soil pH might be a bit off. Dolomitic lime will, usually, correct this if adding nitrogen does not fix the problem.
Here is an article on the care of the tree: https://www.gardeningknowhow.com/edible/fruits/guava/growing-guava-fruit-trees.htm