Field Method for Testing Repellency of an Icaridin-Containing Skin Lotion against Vespid Wasps.
Vespid wasps are ecologically beneficial predators of insects but their stings also pose a human health risk. Current control methods based on killing vespids are suboptimal. Here, the repellent effect against Vespula vulgaris of a 20% icaridin skin lotion was evaluated under field conditions. An experimental setup was designed in which six artificial skin pieces (10 × 10 cm) were video-recorded for 1 h, to count each min the numbers of flying and feeding vespids. Prior to monitoring, five pieces were successively smeared with 2 mg of cream per cm², in 30 min intervals, from t = -120 min to 0. The sixth sheet remained untreated to serve as a control. One milliliter of an attractant, fruit jam, was deposited on each of the six surfaces at t = 0. The control surface was free of any flying or feeding vespid during an average period of 25 min, whereas the other five surfaces (treated at t = -120, -90, -60, -30, and 0 min) remained vespid-free for 39, 40, 45, 49, and 51 min, respectively. The skin lotion remained significantly active for at least 2 h. The experimental methodology is adjustable and allows the study of repellents against vespids in semi-natural conditions.
Service Entomology, O.D. Taxonomy and Phylogeny, Royal Belgian Institute of Natural Sciences, Rue Vautier 29, Brussels B-1000, Belgium. jean-luc.boeve@naturalsciences.be.
Jean-Luc
JL
Boevé
Oystershell Laboratories, Booiebos 24, Drongen B-9031, Belgium. frank.eertmans@oystershell.be.
Frank
F
Eertmans
Bellemdorpweg 95, Aalter B-9981, Belgium. adriaens.consulting@telenet.be.
Els
E
Adriaens
Oystershell Laboratories, Booiebos 24, Drongen B-9031, Belgium. bart.rossel@oystershell.com.
Bart
B
Rossel
Vespula vulgaris; body cream; field tests; icaridin; repellency; vespids