PHYSIOLOGY OF SHOOT GALL FORMATION AND ITS RELATIONSHIP WITH JUVENILITY AND FLOWERING IN MANGO
Endogenous auxin level increased in affected over healthy shoots by 0.047 μg/g as assessed by Oat coleoptile test. Total phenols, on the other hand, decreased by 0.70 mg/g in affected with 5.70 mg/g as against 6.4 mg/g in healthy shoots. While tyrosine and tryptophan content decreased to 0.089 and 0.0128 mg/g at maximum feeding stage of nymphs in affected as against 0.0928 and 0.0150 mg/g in healthy shoots respectively. Use of gibberellic acid (GA), naphthalene acetic acid (NAA), maleic hydrazide (MH), CCC, abscisic acid, alar did not affect gall formation except 2,4-D and 2,4,5-T (100 mg/kg and above) which gave rise to abnormal galls with open scales and elongated axis.