TRAP DESIGNS FOR MONITORING EMERGENCE OF FRANKLINIELLA-BISPINOSA (MORGAN) (THYSANOPTERA, THRIPIDAE) FROM SOIL IN CITRUS GROVES

Three emergence trap designs were evaluated for effectiveness in colle cting adult Frankliniella bispinosa (Morgan) (Thysanoptera: Thripidae) from beneath and between citrus trees in Florida. Trap A [a wooden-fr ame 30- by 30-cm (= 900 cm2) square trap with removable Plexiglas(R) l id coated with Tangle-Trap(R) adhesive] was effective in trapping F. b ispinosa adults whereas trap B [a polyvinylchloride (PVC) round trap w ith a centered 3.7-mL capacity shell vial] was ineffective. Trap A was as effective in collecting emerging F. bispinosa adults as trap C [a PVC round trap with a 30-cm-diameter (= 706.5 cm2) removable adhesive- coated Plexiglas lid]. Comparative costs for trap construction, mainte nance, and insect counting are all higher for trap A compared with tra p C. Trap placement beneath citrus trees 15 cm from the trunk or just inside the dripline of the canopy provided similar thrips catches in t wo citrus grove sites. Both interior and dripline trap positions benea th ''navel'' orange trees had significantly higher numbers of F. bispi nosa than did traps exposed within rows between these trees.