DefinePK

Abstract

The effect of different insecticides (Radiant, Steward, Coragen) was evaluated against spotted bollworm on okra during 2016.  The experiment was conducted in RCBD with three replications and three treatments. Pretreatment observation was taken 24 hours before application of insecticides and post treatment observations were taken 48, 96 hours and 7 days after treatment. First spray after 96 hours’ the larvae population was lowest (0.90 plant-1) and after 7 days of spray highest (1.28 plant-1) while (2.09 plant-1 live larvae plant-1) was recorded in control plot. The Steward showed high reduction (1.46 plant-1), followed by Coragen (1.20 plant-1) and Radiant (0.79 plant-1) in live larvae population. After second spray of 96 hours in live larvae population was lowest (0.58 plant-1) and after 7 days of spray highest (1.01 plant-1) while (1.04 plant-1) was recorded in control plot. The Steward resulted higher reduction in live larvae population (0.86 plant-1), Coragen (0.64 plant-1), Radiant (0.57 plant-1) as compared with control (0.97 plant-1). Steward insecticide showed great effect against spotted bollworm and its live larvae population as compared to other insecticides. The maximum number of fruits plant-1 (55.66) and average fruit yield per acre (7062 kgs) was recorded in plot spread with Radiant and lowest (4070) in control plot.
Keywords: Efficacy; Insecticides; Okra; Spotted bollworms
http://dx.doi.org/10.19045/bspab.2018.700109