Integrated management of Bactrocera (Dacus) dorsalis (Hendel) in mangos.
Gajendra Singh
Author Affiliation: G.B. Pant University of Agriculture & Technology, Pantnagar 263145, India.
: 821-828
Abstract : Studies in Pantnagar, Uttar Pradesh, India, indicated that Bactrocera dorsalis damage was reduced to 4.6% by harvesting mango var. Dashehari fruits at physiological maturity, compared with 10% in fully ripe dropped fruits. Damage was similarly reduced from 8% to 4% in var. Bombay Green. Methyl eugenol (0.2%) was used to bait 4 traps/acre for 18 weeks (2nd April to 30th July) and resulted in a reduction in damage of 71.11% in physiologically mature fruits (var. Dashehari) and 71.15% in damage of fully ripe dropped fruits. The largest trap catches of 233 males/week occurred between 18 June and 25 June. Adult emergence was zero when fully mature larvae pupated at a soil depth of 30 cm, followed by 20, 65, 45 and 30% emergence at 20, 10, 5 and 0 cm depths, respectively, indicating the suitability of a 30 cm depth for burying the damaged fruit. In trials of bait traps, mango juice (5%) was the most effective bait in reducing damage to fruits (36.6% in physiologically mature and 17% in dropped fruits). Two high-volume sprays of deltamethrin (0.002%) gave an 83.3% reduction in the damage of physiologically mature and 78.80% in dropped fruits. This was on a par with fenvalerate (0.015%). The only parasitoid recorded was Biosteres dacusii.