The galls on the leaves of Syzygium jambos were found to be single or in clusters on the adaxial or sometimes on both the surfaces of the leaf. The galls were variable in size, as their length varied between 10-25 mm in length and 1-4 mm in breadth. They were irregular and tunnel like in shape. Young galls were greenish-yellow in colour and became brown at the time of maturity. The number of galls on a leaf varied from one to many. As 5-6 galls had been observed on a single leaf. The interior of the gall contained a circular or oval cavity which opened outside by a minute ostiole formed on the abaxial surface of leaf. The nutritive parenchyma cells are transformed into nutritive cells as the larva grazes and show increased lipid and protein concentrations as well as an increase in amylase activity which gets reflected by reduced concentrations of starch in the gall. As the gall reaches maturation, cell proliferation ceases, most of the gall tissues lignify, besides this the larva matures and finally adult is formed. Eventually the gall desiccates and adult comes out.
