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<Author> Mitsugu SUGIYAMA ; Yukio SHIMOJI ; Tsuguo KOHAMA |
A new funnel-based sex pheromone trap was designed for monitoring the sweetpotato weevil, Cylas formicarius (FABRICIUS), and its effectiveness was compared with a funnel trap which has been used for monitoring thus far. Five traps of each type were alternately placed at 100 m intervals along a straight road which was surrounded by fields of sugarcane and sweet potato. A rubber dispenser containing 0.1 mg of the synthetic sex pheromone was used as an attractant. During the study period, a total of 3,678 and 4,311 male weevils were caught in the new and earlier version traps, respectively. No significant difference was found between the two trap types in the number of weevils caught. Both types of traps also collected other arthropods. The new traps caught 17 individuals, while 286 were caught in the earlier type traps. The latter traps captured significantly more superfluous arthropods than the new traps. |
