1Department of Agricultural Entomology, Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal, 609603, U T of Puducherry, India
Department of Entomology, Faculty of Agriculture, Annamalai University, Chidambaram, 608002, Tamil Nadu, India
*Email: kandibane2015@gmail.com (corresponding author)
Online Published on 6 February, 2023.
Efficacy of botanical extracts was evaluated against the rice stem borer Scirpophaga incertulas (Wlk.) at PAJANCOA and RI, Karaikal during kharif 2019 and rabi 2019-2020. The results revealed that thiamethoxam 25WG @ 100 g/ha reduced incidence to 4.99% and 4.13% (52.15 and 61.80% reduction, respectively). Among the botanicals, garlic and chilli extract 5% reduced this to 5.69% and 5.48%. The predatory coccinellids and spiders were more in untreated check and it was found at par with garlic and chilli extracts at 5%, followed by five leaf extracts @10% and bitter apple leaf extract 10%. The benefit cost ratio (BCR) was maximum with thiamethoxam 25WG @ 100 g/ha (1: 1.67 and 1: 2.10), followed by garlic and chilli extract 5% (1: 1.59 and 1:1.91).
Rice, Scirpophaga incertulas, Garlic and chilli extract, Leaf extracts, Bitter apple, Ponneem, Thiamethoxam, Novaluron, Predatory coccinellids, Spiders, Cost benefits
