Field evaluation of Pseudomonas fluorescens against the cotton leaf roller, Sylepta derogate (Crambidae: Lepidoptera) in Bt and non Bt cotton

Abstract

An investigation was carried out during 2015-16 and 2016-17 to evaluate the Pseudomonas fluorescens against the leaf roller, Sylepta derogata, in Bt and non Bt cotton at Vanavarayar Institute of Agriculture, Pollachi. Apart from the infestation, comparative seed cotton yield was also assessed. The obtained results indicated that all treatments except control exhibited a great reduction in leaf roller infestation and the larval population. The treatment could be arranged descendingly according to the general reduction of two seasons s follows; Profenophos 50 EC @ 1 lit/ha, Foliar application of P. fluorescens @1% and Beauveria basianna @ 1%, Soil and Foliar application of P. fluorescens @1%, Foliar application of Beauveria basianna @ 1%, Foliar application of P. fluorescens @1% and Soil application of P. fluorescens 2.5 kg/ha against pink bollworm.