title: Management of winter weeds affects Frankliniella fusca (Thysanoptera: Thripidae) dispersal.
abstract: Frankliniella fusca (Hinds) naturally disperses from winter weeds to crops in spring, causing direct and indirect damage. Field preparation before planting includes use of herbicides or cultivation to kill unwanted vegetation, which adversely affects F. fusca host plants and potentially  influences F. fusca dispersal. Common chickweed, Stellaria media (L.), infested with F. fusca, was used as a model to study effects of timing and type of vegetation management on adult dispersal. Infested weeds were caged and F. fusca weekly dispersal was monitored using sticky traps. Weed  management treatments performed at an early (14 April-11 May) or late (2 wk after early treatment) date consisted of glyphosate, paraquat, disking, hoeing, or untreated control. Late glyphosate and hoeing treatments resulted in cumulative dispersal statistically similar to or greater  than from control plots. Compared with the control, significantly more F. fusca dispersed from the glyphosate and hoeing plots during the 3 wk after treatment. More thrips dispersed from the late paraquat treatment 1 wk post-application than from the control. Dispersal from the disked treatment  and early paraquat treatment was similar to that of the control 1- to 3-wk post-treatment. Early treatments resulted in significantly smaller cumulative dispersal than the control in all but one instance. Late disking and paraquat treatments resulted in cumulative F. fusca captures that were  statistically similar or less than that in the control. Winter weed management type and timing affect F. fusca dispersal magnitude and duration.
authors.affiliation: Department of Entomology, North Carolina State University, Raleigh, North Carolina 27695-7630, USA. alparodi@ncsu.edu
authors.forename: A L P
authors.initials: AL
authors.lastname: Beaudoin
authors.forename: G G
authors.initials: GG
authors.lastname: Kennedy
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D005998:Glycine / Q000031:analogs & derivatives / Q000494:pharmacology; D006540:Herbicides / Q000494:pharmacology; D007300:Insect Control; D057685:Plant Weeds; D012621:Seasons; D061149:Thysanoptera / Q000502:physiology*; D013997:Time Factors; D000097797:Glyphosate
chemical_list: D005998:Glycine; D006540:Herbicides; D000097797:Glyphosate