title: Insecticide resistance in field populations of Frankliniella occidentalis (Pergande) in Murcia (south-east Spain).
abstract: Thirty-nine field populations of Frankliniella occidentalis (Pergande) were collected from different crops (sweet pepper, tomato, lettuce, artichoke, melon, cucumber, carnation, broad bean, peach and plum) in Murcia (south-east Spain). All populations were reared separately in the laboratory to obtain enough individuals for bioassays. Female thrips were bioassayed, using a standard topical application method, against methiocarb, methamidophos, acrinathrin, endosulfan, deltamethrin and formetanate. Methiocarb was the only insecticide that showed a high efficacy against F occidentalis at field dose rates. Acrinathrin and methamidophos were moderately effective, while endosulfan and deltamethrin were ineffective. Only moderate levels of resistance (Resistance Ratios at LC50 of 10-30) were detected for the selective insecticides methiocarb, formetanate and acrinathrin used against F occidentalis in crops where these insecticides are used intensively. This generalized and low level of resistance to these insecticides, coupled with a lack of efficacy for the three broad-spectrum insecticides, was observed even in intensively managed vegetable crops. Implementation of IPM strategies in Murcia has contributed to more successful insecticide anti-resistance management.
authors.affiliation: Departamento de Producción Agraria, Universidad Politécnica de Cartagena, Paseo Alfonso XIII 52, 30203 Cartagena, Spain.
authors.forename: Pedro J
authors.initials: PJ
authors.lastname: Espinosa
authors.forename: Pablo
authors.initials: P
authors.lastname: Bielza
authors.forename: Josefina
authors.initials: J
authors.lastname: Contreras
authors.forename: Alfredo
authors.initials: A
authors.lastname: Lacasa
mesh_terms: D000818:Animals; D018556:Crops, Agricultural / Q000469:parasitology; D007313:Insecta / Q000187:drug effects*; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology* / Q000633:toxicity; D013030:Spain
chemical_list: D007306:Insecticides