Occurrence of melon and oriental fruit fly in Republic of Nauru.
Traps baited with cuelure or methyl eugenol were investigated for monitoring Dacus [Bactrocera] spp. in Nauru in December 1993. Over a period of 3 days, the number of flies caught per trap averaged 2237.2/day with cuelure, catches being highest at the east coast of the island. With methyl eugenol, catches averaged 1114.7/day, and traps at the east coast and near a small lake in a central area were highest. D. frauenfeldi [B. frauenfeldi] comprised 99.9% of the catch with cuelure, whereas D. dorsalis [B. dorsalis] and B. frauenfeldi comprised 47.6 and 51.6%, resp., of catches with methyl eugenol. Smaller numbers of D. cucurbitae [B. cucurbitae] and D. xanthodes [B. xanthodes] were caught. After 3 days all 21 of the traps used were removed to a demonstration farm of area less than 2 ha. After about 1 month's trapping at a demonstration farm of less than 2 ha area with 21 traps, the numbers of flies attracted decreased significantly.