The leaf galls caused by psyllids are epiphyllous, conical, unilocular, hard yellowish-green. Galls develop on both sides of the leaf blade, measuring about 2-3 mm high and 1-2 mm thick at the base (Mani, 1973). [..] T. cinnamoni preferred young, growing incompletely expanded leaves than mature and over mature leaves and there was a positive significant correlation between gall counts and the proportion of young leaves. Gall initiation in cinnamon therefore, appears to be largely restricted to young tender leaves. [..] T. cinnamoni exhibited a strong preference for the top crown level of the plant and this may be due to the preponderance of young leaves in this sector of the tree.

The feeding by [..] the psyllid causes abnormal cell development and the formation of galls. The developing galls enclose the feeding [..] psyllid.