67 - Semi-field Evaluations of ReMoa Tri with Backpack ULV

The Coachella Valley Mosquito and Vector Control District (District) has had concerns about pyrethroid resistance with local mosquito species (Cx. quinquefasciatus). The District primarily uses pyrethroid-based products for adulticide treatments in response to arbovirus detection. Fyfanon (organophosphate: malathion) has shown to be effective, however this still limits the District to two types of active ingredients for product rotation. The lack of choices in active ingredients raises concerns about the inability to effectively rotate products for adulticide treatments. After bottle bioassays demonstrated that there is resistance in local Cx. quinquefasciatus populations to pyrethroids, the District began exploring the potential of Valent’s product ReMoa Tri. Semi-field evaluations of ReMoa Tri were conducted using a Colt4 handheld applicator and a Fontan PortaStar S backpack. Both evaluations used a dilution of the product with ReMoa Tri diluent. The Colt4 had a higher dilution ratio (1:4) and did not perform as well. It was later determined that the product could not be diluted more than 1:2 product to diluent. The subsequent semi-field treatments with the PortaStar backpack at a reduced dilution showed that the product was effective against local populations of resistant mosquitoes.