Wooden and rubber fruit models of different shapes, colors, and sizes were hung in fruiting coffee trees. Spheres (7.5 cm in diam) were much more attractive to Ceratttis capitata (Wiedemann) than cubes, cylinders, or rectangles of equivalent surface area. Black and yellow were the most attractive of eight colors, and white and grey were the least attractive. When an array of sphere sizes were tested, the attraction to flies increased as the size of yellow spheres increased from 1.5 to 18 cm diam. Trimedlure (tert-butyl 4(5)-chloro-2-methylcyclohexanecarboxylate) enhanced the attraction for males when added to 20.3 • 25.4-cm yellow rectangles and to 7.5-cm black spheres.Both chemical and physical stimuli attract tephritid flies to host plants (Prokopy, 1977a). After arrival on plants, Rhagoletis pomonella (Walsh) and Dacus oleae
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