Level of paclobutrazol residues in shoot and fruit of mango.
Singh D. K., Ram S.
Author Affiliation: Krishi Vigyan Kendra, Anta, Baran, Rajasthan - 325202, India.
Indian Journal of Plant Physiology 5 : 186-188
Abstract : In trials in Uttar Pradesh, India, Dashehari and Langra mango trees were treated on 15 September or 15 October 1993, and again on 15 September or 15 October 1994, with paclobutrazol (PBZ, 2.3 g a.i./metre tree canopy diameter) applied as a soil drip. PBZ residue levels were measured in shoot tips 30, 60, 90, and 120 days after PBZ application. PBZ residues in shoot tips were higher in trees treated in September than in trees treated in October, were higher after the second year of application and were detected earlier after the second year application. PBZ residues were generally higher in the seed than in the mesocarp of harvested fruits, were higher in fruits from trees treated in September than in October, and were higher in fruits from trees treated twice. PBZ residue levels were similar in both cultivars. PBZ residues in fruits were 0.004 mg/kg which was below the maximum accepted value (0.05 mg/kg).