Management of san jose scale, Quadraspidiotus perniciosus Comstock in apple orchards of Kashmir through horticultural mineral oils

摘要

The field experiment, conducted with the objective of examining the efficacy of different concentrations of two oil dormant sprays of Arbofine extra along with standard check (ATSO) to manage san jose scale (Quadraspidiotus Perniciosus Comstock) in delayed dormant season of 2015-16, revealed highest comulative mean mortality of SJS (82.69%) with the application of 2.5 per cent of Arbofine extra followed by 80.71 per cent mortality of SJS with 2.0 per cent of Code-204 as against the standard check (ATSO) applied at 2.5 per cent concentration (80.12%) and the lowest (76.47 per cent) at 1.5 per cent concentration. Two parasitoids, Encarsia pernicious and Aphytis proclia and one predator Chilocorus infernalis were found on SJS twigs from the treated area. Arbofine extra @ 2.5 per cent concentration recorded mean yield (10.0 boxes) of 'A' grade followed by 8.33 boxes @ 2.0 per cent concentration.