Informatics Publishing Limited

V. Venkadasubramanian ¹, P. M. M. David ¹

Affiliations
1 Department of Agricultural Entomology, Agricultural College and Research Institute, Killikulam, Vallanad 628 252, Tamil Nadu, IN

Abstract

Bioefficacy of commercial Bacillus thuringiensis (B.t.) products namely Delfin (B.t.var.kurstaki), Spicturin (B.t.var.galleriae) and Agree (B.t.var. kurstaki+aizawai) (each at 0.1%) in combination with botanicals viz., neem (Azadirachta indica A. Juss) seed oil (1.5%), mint (Mentha spicata L.) leaf extract (2.5%), sweet flag (Acorus calamus L.) rhizome extract (0.5% ), bracteated birthwort (Aristolochia bracteata Retz.) leaf extract (2.5%), mesquite (Prosopis juliflora DC.) leaf extract (2.5%), Indian aloe (Aloe vira L.) leaf extract (0.5%) and palmarosa plant (Cymbopogan martini Wats.) oil (0.5%) was tested in laboratory against tobacco cutworm, Spodoptera litura (Fabricius) and gram pod borer, Helicoverpa armigera (Hubner). Toxic effects of B.t. products and palmarosa oil in mixture were significantly superior to that of other combinations.

Keywords

Bacillus thuringiensis, Botanicals, Helicoverpa armigera, Spodoptera litura.

Full Text

   

V. Venkadasubramanian ¹, A. Janagarajan ¹, P. M. M. David ¹

Affiliations
1 Department of Agricultural Entomology, Agricultural College and Research Institute, Killikulam 628 252, Tamil Nadu, IN

Abstract

The influence of Electrical Conductivity (EC) - based quality of water, used as spray fluid, on the bioefficacy of commercial formulations of Bacillus thuringiensis (Berliner) (B.t.) was studied in laboratory bioassays against Spodoptera litura (Fabricius) and Helicoverpa armigera (Hiibner). EC quality did not alter the efficacy of B. t. formulations significantly. However, larval mortality decreased with increase in EC.

Keywords

Bacillus thuringiensis, Bioefficacy, Helicoverpa armigera, Spodoptera litura, Water Quality.

Full Text