author(s)
Nitesh Sharma and Divender Gupta

abstract
The Tephritidae fruit flies are a major limitation in the cultivation of cucumber in the mid-hill region of Himachal Pradesh State of India. To manage the menace of fruit flies the experiment was laid to study the efficacy and monetary returns of different new insecticides against fruit flies during cropping season 2018. The results of the bioefficacy study revealed lambda-cyhalothrin @ 0.004% with least fruit infestation (17.13%) as the most effective insecticide in checking the fruit fly population which was followed by emamectin benzoate @ 0.002% (24.64% infestation). Also, the maximum avoidable loss (65.57%) was recorded in ƛ-cyhalothrin followed by emamectin benzoate (61.11%) treated plots which proved their efficiency in managing fruit flies. The highest benefit cost ratio (BCR) was recorded in ƛ-cyhalothrin (28.74:1) and was followed by malathion (5.67:1) treatment. In rynaxypyr and diflubendiamide treatments the negative BCR ratios were obtained due to very high cost of the test treatment.