Cross-Resistance and Baseline Susceptibility of Spirotetramat in Frankliniella occidentalis (Thysanoptera: Thripidae)

• Published in: Journal of economic entomology Vol. 107; no. 3; pp. 1239 - 1244
• Main Authors: Guillén, Juan, Navarro, Miguel, Bielza, Pablo
• Format: Journal Article
• Language: English
• Published: Oxford, UK Entomological Society of America 01.06.2014; Oxford University Press
• Subjects: Animals; Aza Compounds - pharmacology; Bioassays; Confidence limits; Cross-resistance; Economic importance; Female; Frankliniella occidentalis; Insecticide Resistance; INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT; Insecticides; Insecticides - pharmacology; Instars; Larva - drug effects; Larva - genetics; Larva - growth & development; Larvae; Lethal effects; Low resistance; Methiocarb; Ovum - drug effects; Pest resistance; Resistance factors; Spain; Spinosad; Spiro Compounds - pharmacology; Test procedures; thrip; Thysanoptera - drug effects; Thysanoptera - genetics; Thysanoptera - growth & development; spinosad; cross-resistance; insecticide resistance; thrip
• ISSN: 0022-0493; 1938-291X; 0022-0493
• DOI: 10.1603/EC13397

Western flower thrips, Frankliniella occidentalis (Pergande), is an economically important pest all over the world. New products against thrips are necessary, as there are few effective compounds exhibiting cross-resistance among them. Lethal effects, cross-resistance, and baseline susceptibility to spirotetramat were evaluated in this study. A new bioassay method for testing thrips against spirotetramat was developed. Spirotetramat showed a significant mortality effect on larvae after 7 d of exposure, but a low effect was observed on adults. Baseline results for larval instars showed LC50 values ranging from 11.59 to 49.81 mg AI/liter, with a low natural variability (3.2-fold). Cross-resistance studies showed overlapping confidence limits of the LC50 values for laboratory-selected (against acrinathrin, methiocarb, formetanate, and spinosad) resistant and susceptible strains, and low resistance factors, from 0.5 to 1.9, suggesting no cross-resistance to conventional insecticides previously used. A slight ovicidal effect (21–40% reduction) was also detected. Despite presenting low effects on adults, spirotetramat showed high but slow efficacy on F. occidentalis larvae. Field populations in southeast Spain showed a consistent susceptibility to spirotetramat. Given the scarcity of effective products and the lack of cross-resistance to other insecticides, spirotetramat can be considered as a good chemical tool to control F. occidentalis.