author(s)
Nagendra Kumar and Nripendra Laskar

abstract
An experiment was conducted to evaluate the efficacy of different food bait prepared from ripened fruit pulps for attraction of Bactrocera species at Pundibari, cochlear, West Bengal during the year 2017 and 2018 at farmer field. Self-made transparent rectangular PET plastic jars around 1 liter capacity and having four circular holes of 1 cm in diameter on four sides of the jar just below the shoulder of the bottle (i.e. 1/ 3rd from top) openings for the entry of flies. The mean values of fly capture of two years pooled data (2017 and 2018) has revealed that statistically highest efficacy of mean number (7.88 flies/trap/day) of flies was captured in T2 (Grape pulp+ 0.5 ml Spinosad 45% SC) and lowest mean number of flies was captured in T5 (Papaya pulp + 0.5 ml Spinosad 45% SC) trap (2.75 flies/trap/day) at 1st DAI. When overall mean values of trap-catch were considered, highest efficacy was noted by using T2 (Grape pulp+ 0.5 ml Spinosad 45% SC) (3.00 flies/trap/day) as bait material followed by T1 (Banana pulp+ 0.5 ml Spinosad 45% SC) (2.47 flies/trap/day), however, two bait material had statistically superior among all the treatments. On the contrary, T5 (Papaya pulp + 0.5 ml Spinosad 45% SC) trap (0.91 flies/trap/day) followed by T6 (Pineapple pulp + 0.5 ml Spinosad 45% SC) trap (1.38 flies/trap/day) recorded the lowest number of flies trapped. These results showed that the efficacy of all the bait materials gradually decreased over time, i.e. at days after preparation and placement of baits. This gradual decrease in the efficacy of the baits may be due to evaporation, drying and other environmental factors. Among the species diversity, only three species were identified B. cucurbitae, B. dorsalis and B. correcta. The dominant species was noted B. cucurbitae range from (48.28%-52.08%) followed by B. dorsalis (40.91%- 44.62%) and B. correcta (4.62%- 11.46%).