Abstract

CHANGES IN SHAPE, SIZE AND COLOR OF THE GALLS INDUCED BY TRIOZA FLETCHERI CRAWFORD, ON TREWIA NUDIFLORA, DURING SUMMER AND WINTER

Om Datta*, Dr. Sunil Tomar and Dr. S. C. Dhiman

Abstract

Trioza fletcheri is a gallinaceous insect which makes foliar galls on a forest tree, Trewia nudiflora. The galls are formed on dorsal side of the leaf and pouch like. Shape, size and colour of the gall varies according to the season (Winter, Summer, Rainy). Maximum gall formation occurs in July to September. In winter colour of the gall changes from greenish to pinkish red due to phenolic compound development which trap heat of the sun to warm nymphs inside the gall.

Keywords: Gall, Trewia nudiflora, Trioza fletcheri.