02400naa a2200229 a 450000100080000000500110000800800410001902200230006002400390008310000170012224501450013926000090028450001040029352014560039765300160185365300160186965300130188565300100189865300180190870000170192677302270194310637882022-11-25       2022    bl uuuu     u00u1 u    #d  a1366-5863 (online)7 a10.1080/09670874.2022.21235702DOI1 aCOLLARES, M.  aEffect of Avena strigosa straw and rainfall on sulfentrazone and flumioxazin control effectiveness of Amaranthus spp.h[electronic resource]  c2022  aArticle history: Received 26 May 2022, Accepted 25 August 2022, Published online: 11 November 2022.  aABSTRACT.- Cover crops constitute an interesting option for cultural weed control. Expansion of herbicide resistant weeds in Uruguay, has been associated with an increase use of pre-emergent herbicides for their control. Crops residues could decrease their effectiveness. The objective of these work was to evaluate the effect of Avena strigosa straw and moment and amount of rain, in Amaranthus spp. control effectiveness by flumioxazin and sulfentrazone. Two experiments were carried out for each herbicide in pots, in a greenhouse. The design was in randomized complete blocks, with five repetitions and factorial arrangement of treatments. In experiments I, factors were: I) amount of A. strigosa straw (0 and 6 t ha-1); and II) amount of rainfall (20 and 80 mm), for each herbicide. In experiments II, factors were: I) amount of A. strigosa straw (0 and 6 t ha-1); II) amount of rainfall (20, 60 mm); and III) Days between application and rainfall occurrence (1, 7 and 14). Weed emergencies were quantified at days 8, 22 and 39 after rainfall (DAR). Results were independently analyzed using a model with gaussian distribution. Sulfentrazone effectiveness in Amaranthus spp. control was not affected by studied factors. In the case of flumioxazin, straw effect was consistently detected. Amounts of 6 t ha-1 of oat straw reduced Amaranthus spp. control effectiveness of the herbicide. © 2022 Informa UK Limited, trading as Taylor & Francis Group  aCover crops  aFlumioxazin  aRainfall  aStraw  aSulfentrazone1 aVILLALBA, J.  tInternational Journal of Pest Management, 2022, vol. 68, issue 4: "Uruguayan Society of Phytopathology (SUFIT): Plant protection for a sustainable agriculture", p.423-428. doi: https://doi.org/10.1080/09670874.2022.2123570