Evaluation of acaricides against two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) infesting rose under field conditions

Abstract

Field experiments on evaluating the effectiveness of new molecules of acaricides against Tetranychus urticae infestation on rose crop was conducted during summer 2021-22 and 2022-23 at Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga, Karnataka, India. The results of the experiment indicated that cyenopyrafen 30 SC @ 0.80 ml/l was effective acaricide in reducing the mite population. The next best acaricides in their efficacy were fenpyroximate 5 EC @ 2.0 ml/l and diafenthiuron 50 WP @ 1.0 g/l. In terms of bio- efficacy, considering the pooled data on per cent reduction of the mite population compared to the untreated control, the order is: cyenopyrafen 30 SC (87.04%) > fenpyroximate 5 EC (82.73%) > diafenthiuron 50 WP (80.98%) > chlorfenapyr 10 SC (77.93%) > spiromesifen 240 SC (75.93%) and ethion 50 EC (69.09%). Higher benefit cost ratio of 2.54 was recorded in cyenopyrafen 30 SC @ 0.80 ml/1 followed by fenpyroximate @2 ml/1(2.42) and diafenthiuron @1 gm/l (2.25).