The fruit fly is the most damaging to the summer crop of guava. This fly lays its eggs by inserting its sting inside the fruit, from which small larvae are produced and start eating the pulp. The fruit drops off on the ground. Fungal infestation is also common in hot and humid weather. The branches of the plant and the leaves turn yellow, the bark from the stem begins to dry near the ground, the roots rot and the plant dies in a few months. This disease is spread by fungi that attack the roots. Farmers should take special care of the plants. In such gardens, apply the recommended fungicide on the roots of the plants.