Effect of contact and systemic insecticides on the sharpshooter Bucephalogonia xanthophis (Hemiptera: cicadellidae), a vector of Xylella fastidiosa in citrus
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
06/11/2013
06/11/2013
2012
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Resumo |
The knockdown and toxic effects of insecticides of different chemical groups and modes of action registered for citrus in Brazil were investigated for effective control of Bucephalogonia xanthophis, a sharpshooter vector of Xylella fastidiosa in citrus. The active ingredients dimethoate (1.2 mL/1.2L), imidacloprid (0.24 mL/1.2L) and lambda-cyhalothrin (0.24 mL/1.2L), as well as a control (water), were sprayed onto branches of potted-citrus nursery trees to evaluate the effect of residual contact. The insects were confined on sprayed branches by using sleeve cages, in groups of 10 per branch (5 branches/treatment). Lambdacyhalothrin showed a knockdown effect on B. xanthophis (>70% mortality within 2 h of exposure), and the residues were effective for approximately one wk. Imidacloprid, lambdacyhalothrin and dimethoate suppressed the vector populations for up to 3 wk after application, when the insects were exposed to sprayed plants for at least 24 h. In another experiment, 2 neonicotinoid insecticides (thiamethoxam and imidacloprid) were applied by soil drench to potted nursery trees, in order to study their systemic effect, i.e., mortality by ingestion on sharpshooter adults. Thiamethoxam and imidacloprid effectively controlled the vectors at all concentrations tested, when the insects were exposed to treated plants for 24 h (>80% mortality) or 48 h (near 100% mortality). The knockdown effect of thiamethoxam and lambda-cyhalothrin might be particularly important to prevent vector transmission of X. fastidiosa in citrus groves. Programa Nacional de Pos-Doutorado - PNPD/CAPES [23038.039426/2008-97] |
Identificador |
FLORIDA ENTOMOLOGIST, LUTZ, v. 95, n. 4, pp. 854-861, DEC, 2012 0015-4040 http://www.producao.usp.br/handle/BDPI/42610 10.1653/024.095.0406 |
Idioma(s) |
eng |
Publicador |
FLORIDA ENTOMOLOGICAL SOC LUTZ |
Relação |
FLORIDA ENTOMOLOGIST |
Direitos |
openAccess Copyright FLORIDA ENTOMOLOGICAL SOC |
Palavras-Chave | #CITRUS VARIEGATED CHLOROSIS #PHYTOPATHOGENIC BACTERIUM #LEAFHOPPER VECTOR #CHEMICAL CONTROL #KNOCKDOWN EFFECT #HOMALODISCA-COAGULATA HOMOPTERA #SUSCEPTIBILITY #BIOLOGY #ENTOMOLOGY |
Tipo |
article original article publishedVersion |