Relationship between Population build up of Aonidiella aurantii (Maskell) on Rose and Weather parameters

The incidence of scales was observed on 30 rose cultivars, and increased gradually, reaching its peak (65.33 scales/stern) in the first week of March and declined thereafter. T_max, T_min, RH-I, RHI-II and BSH were in the range of 30.3 to 34.5°C, 9.1 to 11.1°C, 11 to 91%,11 to 31%, 9.1 to 10.1 hours, respectively, prevailed during 5^th to 9^th MW appeared to be congenial for multiplication of scales. Increase in scale population was observed to be positively and highly significantly, positively correlated with T_max, BSH and T_min, respectively during phase-I; while T_max and T_min were found to be negatively and highly significant1y correlated with increase in scale population in Phase-II.