Attraction and mortality of oriental fruit flies to SPLAT‐MAT‐methyl eugenol with spinosad.

Category : SPLAT


Studies were conducted in 2007 and 2008 in Hawaii, USA to quantify attraction and feeding responses resulting in mortality of the male oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), to a novel male annihilation treatment (MAT) formulation consisting of specialized pheromone and lure application technology (SPLAT) in combination with methyl eugenol (ME) and spinosad (=SPLAT-MAT-ME with spinosad) in comparison with Min-U-Gel-ME with naled (Dibrom). Our approach involved a novel behavioral methodology for evaluation of slow-acting reduced-risk insecticides. Methyl eugenol treatments were weathered for 1, 2, 4, and 8 weeks in California, USA, and shipped to Hawaii for bioassays. In field tests involving bucket traps to attract and capture wild males, and in toxicity studies conducted in 1 m3 cages using released males of controlled ages, SPLAT-MAT-ME with spinosad performed similar to or outperformed the standard formulation of Min-U-Gel-ME with naled for material aged for up to 8 weeks in the 2008 tests. In laboratory feeding tests in which individual males were exposed for 5 min to the different ME treatments, mortality induced by SPLAT-MAT-ME with spinosad recorded at 24 h did not differ from that caused by Min-U-Gel ME with naled at 1, 2, and 4 weeks. Spinosad has low contact toxicity, and when mixed with SPLAT offers a reduced-risk alternative for control of B. dorsalis, without many of the negative effects to humans and non-targets of broad-spectrum contact poisons such as naled. Our results indicate that SPLAT-MAT-ME with spinosad offers potential for control of males in an area-wide integrated pest management (IPM) system without the need for conventional organophosphates.