author(s)
Navendu Nair, Moulita Chatterjee, Prasenjit Pal and Kalpana Das

abstract
The present study of two years duration was carried out in Tripura to investigate the seasonal incidence of Zeugodacus caudatus and Bactrocera rubigina in relation to abiotic factors using Para- pheromone lure (cue-lure) baited traps. Variations in seasonality among these two species have been found. The adult population of Z. caudatus remained consistently moderate to high during July to October while that of B. rubigina remained moderate to high during March to October. Activity of Z. caudatus remained very low during a prolonged span of time (November to May) as compared to B. rubigina (November to February). Z. caudatus was totally absent in the field from 3^rd week of November to middle of February. However, during some other times of the year i.e. from last week of July to end of October Z. caudatus outnumbered B. rubigina. Z. caudatus has significant positive correlation with maximum temperature (r= 0.410), minimum temperature (r= 0.622) and relative humidity (r= 0.548) whereas B. rubigina has significant positive correlation with maximum temperature (r= 0.731), minimum temperature (r= 0.757), rainfall (r= 0.436) and relative humidity (r= 0.359) at 1% level of significance.