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Type: Artigo de periódico
Title: Chemical Control of Loxosceles intermedia (Araneae: Sicariidae) With Pyrethroids: Field and Laboratory Evaluation
Author: Navarro-Silva, MA
Duque, JEL
Ramires, EN
Andrade, CFS
Marques-Da-Silva, E
Marques, FA
Delay, CE
Fontana, JD
Silva, ACS
Fraguas, GM
Abstract: Bites from the recluse or brown spiders (genus Loxosceles) can cause necrotic lesions and systemic effects in humans throughout the world. In the state of Parana, Brazil, loxoscelism is considered a serious public health problem, and Loxosceles intermedia Mello-Leitao (Araneae: Sicariidae) is associated with the majority of reported accidents. In the present research we evaluated the susceptibility of L. intermedia to pyrethroid insecticides currently used for the control of spiders in both field and laboratory conditions. In laboratory tests, the most active pesticides in descending order were microencapsulated lambda-cyhalothrin(LC(50) = 0.023 mg/kg), nonmicroencapsulated lambda-cyhalothrin (LC(50) = 0.047 mg/kg), deltamethrin (LC(50) = 0.26 mg/kg), and cypermethrin (LC(50)) = 1.38 mg/kg). Cockroaches, Phoetalia circumvagans (Burmeister) (n = 30), killed with microencapsulated lambdacyalothrin, were offered to the spiders. L. intermedia fed on 63.3% of the (lead cockroaches during the first 6 h of experiment; none of the spiders died during the subsequent 15 d. Microencapsulated lambdacyalothrin was chosen for application in two contiguous houses. The mean volume applied was 22.8 mg (AI)/m(2). Dead spiders were found during all the inspections up to 60 d after the initial application. In total, 297 dead spiders were collected; 65.7% in the attic shared by the two homes, 10.8% inside the house that had most cracks and crevices sealed and 23.6% in the control house. The use of lamda-cyhalothrin-based products for L. intermedia control is discussed.
Subject: Sicariidae
pest control
Country: EUA
Editor: Entomological Soc Amer
Citation: Journal Of Economic Entomology. Entomological Soc Amer, v. 103, n. 1, n. 166, n. 171, 2010.
Rights: embargo
Identifier DOI: 10.1603/EC09092
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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