Preference monitoring of Bactrocera spp. through installation of methyl eugenol traps at different heights in Jujube orchard

摘要

An experiment was conducted during the years (2016 to 2017) on preference monitoring of Bactrocera spp. through installation of methyl eugenol traps at different heights in jujube orchard. The pheromone traps baited with lure toxicant mixture (95% methyl eugenol Thiodan insecticide) were installed at (T1) = ground surface, (T2) = 1 m height. (T3) = 2 m height and (T4) = 3 m height. The effect of different heights of methyl eugenol pheromone traps on the male-adult B. zonata and B. dorsalis catches was statistically significant (P0.05); and the fruit fly catches in traps varied significantly during 26-12-16 to 10-04-17 (P0.05). The highest B. zonata catches (61.38) were monitored in traps installed at 2m height; while the weekly B. zonata trap catches simultaneously decreased to (51.35), (43.03) and (38.09) at trap heights of 3 m, 1m and 0 m (surface), respectively. The average weekly trap catches of B. zonata were 83.7. The maximum weekly B. dorsalis catches (0.49) were found in traps installed at 2 m height; while the weekly B. dorsalis trap catches decreased to 0.43, 0.36 and 0.29 when the traps were installed at 3 m, 1 m and 0 m (surface) heights, respectively. The average weekly trap catches of B. dorsalis were 7.65. It was concluded that the methyl eugenol pheromone traps were most effective when installed at 2 m height; while traps installed at 3 m and 1 m height could not catch B. zonata and B. dorsalis more than the surface installed traps. The B. zonata starts its rapid development from the April with certain fluctuation.