Common Pests/ Diseases of Guava Fruit tree

Young guava plants are vulnerable to pests including aphids, scale, mealy bugs and whitefly. If possible, identify the infestation as soon as possible and treat with the least toxic option.
The guava plants are attractive and produce deliciously rich, sweet fruits that are excellent fresh or in desserts.

Guava Plant protection        

The particulars of major pests and diseases of Guava plants and their control measures are described below.
Guava Fruit Fly: During monsoon season, the adult lays eggs on the surface of the guava fruits. On hatching the maggots enter into the guava fruits and cause fruit drop. Plucking and burning of all affected guava fruits are generally recommended. The soil around the tree should be raked during summer months and spray of Malathion 0.05% solution should be applied as control measures. 
Mealy Bug: Mealy bugs suck sap from young guava plant leaves, twigs and flowers. The affected guava plants dry up and the yield is considerably reduced. In order to control mealy bugs the tree should be banned with polyethylene so that the nymphs are prevented from climbing up from the soil surface and spray of 0.1% Metacid is recommended as a control measure of mealy bug.
Guava Wilt: Guava wilt disease is caused by fungi. The affected hybrid guava plants show yellowing of leaves followed by drying of Guava tree leaves and twigs from the tip and finally wilting of the whole tree. As control measures: 

• a) 15 g of Bavistin should be applied at the basin of each plant after pruning in the month of March to September, 
• b) the balance nutrients specially nitrogen should be applied and 
• c) resistant varieties should be grown.