effect of various vermicompost-tea concentrations on life table parameters of macrosiphumrosae l. (hemiptera: aphididae) on rose (rosa hybrida l.) flower

the life table parameters of macrosiphum rosae l. (hemiptera: aphididae) on five vermicompost-tea (tea-compost) concentrations (20, 40, 60, 80 and 100%) and control treatment (0%) on rosa hybrida l. were determined under laboratory conditions. there were significant differences among pre-imaginal period and adult longevity of the aphid on the five teacompost concentrations. the highest mortality occurred at first nymphal instar on all treatments. the life expectancy (ex) of one-day-old adults was estimated to be 30, 35, 37, 40, 42 and 20 days on various tea-compost concentrations and control treatment, respectively. the net reproductive rate (r0) significantly differed on different treatments, which was the highest on control (29.12±2.21 female offspring) and lowest on 100% of tea-compost concentration (15.47±2.12 female offspring). the highest and lowest values of the intrinsic rate of increase (rm) were 0.736±0.171 day-1 (on control) and 0.105±0.005 day-1 (on 100% treatment), respectively. the finite rate of increase (?) varied from 1.101±0.143 day-1 (on 100% treatment) to 1.853±0.001 day-1 (on control). doubling time ranged from 1.806±0.023 (on control) to 4.587±0.161 days (on 100% treatment). the longest mean generation time (t) of the rose aphid was obtained on 100% treatment. the results showed that the 100% of tea-compost concentration had the highest antibiotic effect on population growth of macrosiphum rosae.