An evaluation of ten methyl eugenol trap types for trapping Bactrocera Malaysian A and B. (Dipt., Tephritidae) in Malaysia
1993
Chua, T.H. (Malaya Univ., Kuala Lumpur (Malaysia). Jabatan Zoologi)
Ten methyl eugenol traps for trapping Bactrocera Malaysian A (Mal A) and Malaysian b (Mal B) of the Bactrocera dorsalis (Hendel) complex were evaluated. The traps were: a) 4 types of "container"-traps: Steiner clear - Fizzy bottle clear - Fizzy bottle green - Nakagawa yellow, and B) 6 types of sticky traps: sticky spheres red-green-yellow and sticky panels red-green-yellow. Three sites were sampled: a carambola orchard in Bakalong are (BLK), an experimental farm in University Malaya (UM) and Section 17 in Petaling Jaya (PJ 17), the last two had various species of fruit trees. Traps were set either at ground level, 1 m or 2 m high. Diversity of host plants present affected the species composition of catch. In BLK, Mal A was the dominant species caught (99 %), while in UM and PJ 17, Mal A and Mal B were almost equally common. The mean number of flies/trap/day was significantly different with respect to site and trap types (P below 0.001), but not the height of trap except for Mal B using sticky panel traps. The highest mean number of flies caught/day/trap was: for container traps, 473 Mal A at BLK and 42 Mal B at UM; for spherical sticky, 140 Mal A at BLK and 28 Mal B at PJ 17; for panel sticky 137 Mal A at BLK and 26 Mal B at UM. The container types trapped more fruit flies than the sticky ones, with yellow Nakagawa traps caught the most per day (262 Mal A and 30 Mal B), followed by green fizzy bottles. However, basing on catch/square centimeter entry hole, the fizzy bottles caught twice as many as the Nakagawa traps. Yellow and green sticky traps caught significantly more flies than red ones (spherical: Mal A: F2,116 = 20.67 Mal B: F2,116 7.73; panel: Mal A: F2,116 = 16.19, Mal B: F2,116 = 9.65, all P below 0.001)
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