Field evaluation of lethal ovitraps against dengue vectors from Lahore, Pakistan

Field evaluation of lethal ovitraps (LOs) against dengue vectors was carried out in two municipalities; Samanabad and Mughalpura, of Lahore, Province Punjab, Pakistan from July - October 2009. Each municipality was divided into control and treated blocks. Eighteen houses were selected randomly in each block. Each selected house of control block received two ovitraps containing distilled water / 10% hay infusion alternately hanged in front lawn (outdoor). LOs treated with different concentrations (100, 10 and 1 ppm) of Bti, buprofezin and their integration (1:1) in water / 10 % hay infusion were placed in each treated block. Total 15 collections were made and collected eggs were reared up to adults in laboratory. More (5351) eggs of Ae. aegypti were obtained from treatment blocks as compared to control blocks (4801) of both municipalities, indicating that different treatment groups did not affect oviposition rate. Moreover, LOs with 10% hay infusion yielded more eggs (6,548) as compared to that of simple water medium (3,604). Effect of Lethal ovitraps treated with different concentrations of Bti compared with control in water indicated that 100 and 10 ppm completely inhibit pupae formation as compared to 1 ppm where 41 % and 60 % pupae were formed in Samanabad and Mughalpura respectively. Ovitraps treated with buprofezin were more effective in inhibiting the adult emergence as compared to Bti. In general, LOs containing integration of Bti+buprofezin (1:1) in hay infusion was highly effective in reducing pupae formation and completely inhibit adult emergence in both localities.