Aqueous extracts of six different plants (Acorus calamus, Ageratum conyzoides, Azadirachta indica, Duranta repens, Spilanthes acmella and Urtica dioca) and diluted animal urine (buffalo and cow) were tested for mortality rate of flea beetle (Phyllotreta nemorum) in the laboratory. Results were compared with the effects of commercial neem product (neem azal) on flea beetle mortality. The host plant taken for the study was radish (Rhaphanus sativus). Three concentrations of aqueous plant extracts (1kg/5 l, 1kg/10 l and 1kg/20 l of water), three concentrations of animal urine (20%, 15% and 10%) and two concentrations of neem azal (0.1% and 0.01%) were tested in three replications. Observations on the beetle mortality were made at 24 hrs and thereafter on alternate days for a week (168 hrs). All tested concentrations of S. acmella, buffalo urine and cow urine were effective in flea beetle control; A. calamus, A. indica and U. dioca were significantly better in controlling flea beetle (P
Dried powders of five different plants, rhizomes of Acorus calamus, leaves of Melia azedarach, ripen berries of Piper longum, leaves of Prunus persica and ripen fruit of Lindera neesiana were tested as treatments for the control of potato tuber moth at laboratory. Three concentrations C1 0.05%w/w, C2 0.5%w/w and C3 5%w/w were used in each treatment. The percentage mortality of adult PTM in each treatment was observed at every 24 hours of one week and compared with control. The effects of the treatment were also studied up to first generation constructing the life table. All the concentration of L. neesiana and A. calamus were found effective in PTM control. L. neesaina showed 66.7%, 70.0% and 83.3% and A. calamus 56.7%, 66.7% and 70% adult mortality, 168 hours after treatment in C1, C2and C3 concentrations. The effects of these two treatments persist for long periods, which causes high percentage mortality of larvae and less adult emergence in first generation. Keywords: Phthorimaea operculella, Lindera neesiana, Acorus calamusdoi:10.3126/on.v2i1.320Our Nature (2004) 2: 21-25
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