author(s)
Umesh Das, Supriya Okram, Sujit Kumar Karmakar and Santuno Jha

abstract
Field experiments were conducted to study the species diversity and population dynamics of B. dorsalis, B. zonata in three orchards with different mango cultivars Viz., Amrapali (1^st orchard), Himsagar (2^nd orchard) and Amrapali (3^rd orchard) at Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal during April 2013- April 2014. Similarly screen out the mango cultivars namely Amrapali, Ratna, Himsagar and Fajli against mango fruit fly attack. Maximum population of fruit fly (B. dorsalis, B. zonata) in three orchards was observed in the months April - May 2013 when maximum temperature was 39.55°C. B. dorsalis showed a significant positive correlation coefficient with seasonal average maximum temperature (0.187) and negative correlation with minimum temperature (-0.087), morning relative humidity (-0.257), afternoon humidity (-.511**) and rainfall (-.329 *) while B. zonata showed a significant positive correlation with maximum temperature (0.543**), minimum temperature (0.192) and rainfall (0.017) and significant negative correlation with morning relative humidity (-0.241) and afternoon humidity (-0.215). The variety Amrapali, Himsagar showed a higher susceptibility to mango fruit flies followed by varieties Ratna and Fajli.