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Field studies were conducted in guava orchard near NIA experimental farm, Tandojam to evaluate an efficient trap height and optimum time for trapping the fruit flies as an important component of pest management. To determine appropriate trap height, lure toxicant traps were hung at the height of 2, 4, 6, 8 and 10 feet from ground level and adult flies captured were counted weekly. Similarly, to note diurnal activity of flies, five traps were hung at 10 feet height at 5.00 h and data was recorded after each 2 upto 19.00 h. It was noted that significantly highest number of flies were captured in the traps hung at 10 feet height and maximum population was recorded during 5-7 h.
The results on mean percent pupal recovery of Bactrocera zonata at different depths as influenced by moisture levels indicated that the depth of pupation was significantly affected by moisture percentage in pupation substrate. The 10-15% moisture level of the pupation substrate was useful in holding the pupae. The mean percent adult emergence of B. zonata pupated at different depths of sand with variable moisture levels showed that both moisture levels and depths affected the adult emergence of this fruit fly. The adult emergence was synchronous with the pupation at different depths in sand having respective moisture level. The pupal recovery and adult emergence indicated that 10 and 15% moisture levels were the best suited for optimal pupation and adult emergence of B. zonata.
