title: Sucrose Improves Insecticide Activity Against Drosophila suzukii (Diptera: Drosophilidae).
abstract: The addition of sucrose to insecticides targeting spotted wing drosophila, Drosophila suzukii (Matsumura), enhanced lethality in laboratory, semifield, and field tests. In the laboratory, 0.1% sucrose added to a spray solution enhanced spotted wing drosophila feeding. Flies died 120 min earlier when exposed to spinosad residues at label rates enhanced with sucrose. Added sucrose reduced the LC50 for dried acetamiprid residues from 82 to 41 ppm in the spray solution. Laboratory bioassays of spotted wing drosophila mortality followed exposure to grape and blueberry foliage and/or fruit sprayed and aged in the field. On grape foliage, the addition of 2.4 g/liter of sugar with insecticide sprays resulted in an 11 and 6% increase of spotted wing drosophila mortality at 1 and 2 d exposures to residues, respectively, averaged over seven insecticides with three concentrations. In a separate experiment, spinetoram and cyantraniliprole reduced by 95-100% the larval infestation of blueberries, relative to the untreated control, 7 d after application at labeled rates when applied with 1.2 g/liter sucrose in a spray mixture, irrespective of rainfall; without sucrose infestation was reduced by 46-91%. Adding sugar to the organically acceptable spinosyn, Entrust, reduced larval infestation of strawberries by >50% relative to without sugar for five of the six sample dates during a season-long field trial. In a small-plot field test with blueberries, weekly applications in alternating sprays of sucrose plus reduced-risk insecticides, spinetoram or acetamiprid, reduced larval infestation relative to the untreated control by 76%; alternating bifenthrin and phosmet (without sucrose) reduced infestation by 65%.
authors.affiliation: Connecticut Agricultural Experiment Station, Valley Laboratory, 153 Cook Hill Rd., Windsor, CT 06095. Corresponding author, e-mail: Richard.Cowles@ct.gov.
authors.forename: Richard S
authors.initials: RS
authors.lastname: Cowles
authors.affiliation: Rutgers University, Department of Entomology, Philip E. Marucci Blueberry and Cranberry Research Center, 125A Lake Oswego, Chatsworth, NJ 08019.
authors.forename: Cesar
authors.initials: C
authors.lastname: Rodriguez-Saona
authors.affiliation: Rutgers University, Department of Entomology, Philip E. Marucci Blueberry and Cranberry Research Center, 125A Lake Oswego, Chatsworth, NJ 08019.
authors.forename: Robert
authors.initials: R
authors.lastname: Holdcraft
authors.affiliation: New York State Agricultural Experiment Station, Department of Entomology, Cornell University, 630 W. North St., Geneva, NY 14 456.
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Loeb
authors.affiliation: New York State Agricultural Experiment Station, Department of Entomology, Cornell University, 630 W. North St., Geneva, NY 14 456.
authors.forename: Johanna E
authors.initials: JE
authors.lastname: Elsensohn
authors.affiliation: New York State Agricultural Experiment Station, Department of Entomology, Cornell University, 630 W. North St., Geneva, NY 14 456.
authors.forename: Steven P
authors.initials: SP
authors.lastname: Hesler
mesh_terms: D000818:Animals; D029798:Blueberry Plants; D004330:Drosophila; D031985:Fragaria; D007306:Insecticides / Q000008:administration & dosage*; D010574:Pesticide Synergists; D013395:Sucrose
chemical_list: D007306:Insecticides; D010574:Pesticide Synergists; D013395:Sucrose
keywords: Drosophila suzukii; adjuvant; insecticide; phagostimulant; spotted wing drosophila