EFFICACY EVALUATION OF INSECTICIDES ON LARVAE OF THE TOMATO BORER TUTA ABSOLUTA, MEYRICK (LEPIDOPTERA: GELECHIIDAE) UNDER LABORATORY CONDITIONS
Eleonora A. Deleva, Vili B. Harizanova
Pages: 158-164 Published: 1 Jun 2014
Views: 2,848 Downloads: 2,854
Abstract: The tomato borer Tuta absoluta (Meyrikc) is a serious pest of tomato. In Bulgaria it was recorded in 2009 and currently is found in all tomato-producing regions. The control is difficult because of the resistance to many of the known insecticides. With the aim to evaluate the efficacy of some prospective insecticides for control of the pest, experiments were conducted in 2012 - 2013 under laboratory conditions (25 ± 2 ºС, RH 60–70%,16:8 h L:D) at the Agricultural university-Plovdiv. The efficacy of 11 plant protection products with different mode of action was tested on larvae 2nd and 3th instar with two variants: treatment of tomato leaves with larvae in the mines (variant A), and treatment of leaves and release of larvae on the treated leaves (variant B), each with 15 replicates and control. In both variants 100% biological efficacy were recorded for azadirachtin, emamectin benzoate, spinosad, metaflumizone and chlorantraniliprole.