Affected vines show general foliar yellowing, stunted and twisted leaves with shortened internodes
Elongated spike stalk, aborted and transformed flower buds into narrow leaf like structures
The flower buds develop into small vegetative branches, resembling the fruiting laterals, with nodes/ internodes and narrow leaf like structures which gives brush like apperance
Management
Raise cuttings from disease free vines and also avoid normal vines from infected gardens
Uproot the infestedvines along with the roots and destroy
Spray Dimethoate 30 EC (2 ml/ litre of water) to control the vector
Dept of Agriculture Development 
SFAC Kerala