The effectiveness of a green light emitting diode (LED) trap at capturing the West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) in a sweet potato field.
A light emitting diode (LED) colour ray was used to determine the most effective light colour to capture the West Indian sweet potato weevil, E. postfasciatus. Preference tests were conducted using four colours of LED ray (blue, green, yellow and red) at fixed light quanta in the laboratory. The weevils preferred the green LED to the three other LEDs. The effectiveness of a green LED trap was subsequently compared with that of a sweet potato root trap in a sweet potato (cv. Bise) field in Okinawa, Japan, from October to March 2002, with mature potatoes. The green LED trap was confirmed to be applicable for monitoring of the number of weevil.