1Division of Crop Protection, ICAR-Sugarcane Breeding Institute, Coimbatore, 641007
2Department of Agricultural Entomology
3Department of Agronomy, Agricultural College and Research Institute, Madurai, 625104
4Department of Nematology, Tamil Nadu Agricultural University, Coimbatore, 641003
Department of Agricultural Entomology, Department of Agronomy, Agricultural College and Research Institute, Madurai, 625104
*Email: prof.chinniahento@gmail.com (corresponding author)
The field experiment to evaluate insecticides against sugarcane web mite Schizotetranychus andropogoni Hirst was conducted at a farmer's holding at Alanganallur village (Alanganallur block, Madurai District) on sugarcane (variety Co 86032) during May 2016-April 2017 in a randomized block design (RBD) with nine treatments. The treatments include: spiromesifen 240 SC @ 168 g a.i./ha, etoxazole 10 SC @ 33 g a.i./ha, fenazaquin 10 EC @ 125 g a.i./ha, ethion 50 EC @ 625 g a.i./ha, fenpyroximate 5 EC 12.5 g a.i./ha, hexythiazox 5.45 EC @ 10.86 g a.i./ha, chlorfenapyr 10 SC @ 100 g a.i./ha, propargite 57 EC @ 712.5 g a.i./ha with an untreated check and three replications. Reduction of web mites was maximum in spiromesifen 240 SC @ 168 g a.i./ha (3.88/2 cm2 area of leaves) followed by fenpyroximate 5 EC @ 12.5 g a.i./ha (4.00/2 cm2 area of leaves) and the lowest in fenazaquin 10 EC @ 125 g a.i./ha (7.84/2 cm2 area of leaves). Similarly, higher cane yield was recorded in spiromesifen 240 SC @ 168 g a.i./ha (109.61 t/ha) followed by fenpyroximate 5 EC @ 12.5 g a.i./ha (109.42 t/ha) as compared to the untreated check (101.05 t/ha). The cost benefit ratio was also higher in spiromesifen 240 SC @ 168 g a.i./ha (1: 2.98) followed by fenpyroximate 5 EC @ 12.5 g a.i./ha (1: 2.87).
Schizotetranychus andropogoni, sugarcane, acaricides, field efficacy, spiromesifen, fenpyroximate, cane yield, cost benefit ratio
