Journal of Entomological Research

The stomach and contact toxicity of quizalofop ethyl 5 EC was tested against 3–9 days old larvae of Spodoptera litura (Fabricius) by larval atomization, leaf atomization and leaf smear methods under laboratory conditions. 3 days old larvae of S. litura by larval atomization method was 0.0036 and 0.0012% at 12 and 24 HAE respectively. Abbott's per cent mortality against 5 days old larvae of S. litura was 66.6, 95.3 and 100% at 0.002, 0.005 and 0.01%, respectively at 24 HAE. The 9 days old larvae survived atomization in a concentration range of 0.00001 to 0.002% upto 72 HAE. In another experiment the effect of quizalofop on growth and development of 5 days old larvae of S. litura was evaluated using leaf atomization method at 0.005, 0.01 (recommended conc.) and 0.02% concentrations. The reduction in larval weight gain over control at 0.005, 0.01 and 0.02% was 53.3, 71.6 and 95.1%, respectively at 48 HAF. The per cent pupation and per cent adult emergence was 55.5, 48.5 & 34.3% and 31.3, 19.2 and 6.06% at 0.005, 0.01 and 0.02% concentrations, respectively, being significantly lower as compared to control. The antifeedant activity of quizalofop ethyl against 3 and 6 days old larvae of S. litura was tested using leaf smear method (24 HAF) at a conc. range of 0.00001 to 0.002%. MLAC and antifeedant activity against 3 days old larvae was 15.3, 13.3, 12.0, 11.7 cm² and 8.0 and 8.9, 20.8, 28.7, 30.7 and 52.5%; and against 6 days old larvae it was 69.0, 67.3, 66.7, 61.0 and 26.7 cm² and 25.8, 27.6, 28.3, 34.4 and 71.3% at 0.00001, 0.0001, 0.0005, 0.001 and 0.002% concentration, respectively.