02115naa a2200169 a 450000100080000000500110000800800410001910000210006024501920008126000090027352014460028265000210172865000200174965000330176970000230180277301200182511323262022-09-12       2022    bl uuuu     u00u1 u    #d1 aCASTILHOS, R. V.  aSeed treatment with insecticides was not effective on reducing Dalbulus maidis incidence and further occurrence of Maize rayado fino and Maize bushy stunt diseases.h[electronic resource]  c2022  aIn this work we evaluated seed treatment using different insecticides on Dalbulus maidis natural infestation and the further incidence of Maize bushy stunt phytopla s ma (MBSP) and Maize rayado fino virus (MRFV) diseases , in a field experiment. The experiment was conducted in second grow ing season of 2020/21 agricultural year in Chapecó, SC, with the P4285 VYHR maize genotype, sown in plots of 24m 2 in a density of 62.500 plants ha 1 . The insecticides evaluated were thiametoxam, imidacloprid, imidacloprid + thiodic arb and clothianidin, all at the  maximum dosage recommended for D. maidis management. A control treatment (absence of insecticides) was also evaluated. For each treatment it was used five replicates (plots). The  number of leafhopper per plant was counted at 3, 7, 10, 14 and 17 days after emergence. At 90 days after emergence the incidence of MBSP and MRFV diseases was evaluated. The number of leafhoppers per plant in the plots subjected to seed treatment did not differ significantly from control in all evaluation dates, showing that pe rhaps the chemical protection of seeds was not effective in suppress D. maidis incidence in early stage s of the crop . Also, there was no significant difference in MBSP and MRFV incidence among treatments, suggesting that seed treatment as a single practice may be ineffective in D. maidis management and stunt disease prevention, especially in cases of high infestation.  achemical control  acorn leafhopper  ainsect transmitted pathogens1 aSILVA, M. C. C. R.  tIn: ENCONTRO SUL-BRASILEIRO DE FITOSSANIDADE, 1., 2022, Chapecó, SC. Anais... Chapecó, SC: Faem Faculdades, 2022.