In addition, the extent of damage was evaluated using a 0 to 6 score chart; where 0 represents no foliar symptoms, 1 means symptom development around the pin-pricked area only, 2and 3 indicate yellowing/browning up to 10% and 11 to 25 % of the leaf area respectively, 4 and 5 signify such symptoms respectively over26 to 50% and 50 to 75% of the foliar area including petioles, and 6 denotes complete drying of the plants.