Evaluation of bait gel dosages for Blattella germanica control.

Blattella germanica is a very important pest in homes, food service establishments and other structures in Sao Paulo city. The roach bait control is usually recommended. The aim this work was to evaluate the minimal dose of different active ingredients in bait commercial gel to B. germanica control. Mortality of different dosages of fipronil, imidacloprid, hydramethylnon and sulfluramide were evaluated on B. germanica adults. The doses were: 0.005; 0.007; 0.01; 0.03; 0.05; 0.07 and 0.1g of commercial gel bait. The insects were individually confined with respective gel dose, water and food; using 20 insects per bait active ingredient dosage. The mortality was assessed at 1, 2, 3, 4, 24, 48, 72, and 96 hours after bait introduction. Fipronil, imidacloprid and hydramethylnon bait gel showed 100% of efficiency in all dosages. Sulfluramide showed 100% of efficiency in dosages between 0.01 and 0.1g of bait gel.