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Survey on Rice Weed Management and Public and Private Consultant Characteristics in Southern Brazil

  • Bruno de Lima Fruet (a1), Aldo Merotto Junior (a2) and André da Rosa Ulguim (a3)

Abstract

Identification of common weeds and problems with weeds is fundamental to determine adequate recommendations for management practices. The aim of this study was to identify the patterns of weed management adopted by rice farmers and the characteristics of consultants who work in flooded rice areas in Rio Grande do Sul state (RS), Brazil. Fifty-three public and fifty private consultants who worked with rice in RS in 2017 and 2018 were interviewed. Data were analyzed by descriptive statistics. Both weedy rice and Echinochloa sp. were the most important species in terms of occurrence and escape from chemical control, since they remained in field until harvest in 59% of the area. According to consultants, the main reasons for reduced weed control were related to herbicide resistance and late herbicide applications. Fifty-six percent of farmers used imidazolinones rates greater than the label in the POST applications. The consultants’ main problems were related to management of weed escapes, resistance management, and guidelines on herbicide rates. Therefore, results show that the use of herbicide rates above the label, and the consultants’ work on control of weed escapes are directly related to the high occurrence of herbicide resistance.

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Copyright

Corresponding author

Author for correspondence: Federal University of Santa Maria, Department of Crop Protection, 1000 Roraima Ave, 97105-900, Santa Maria, Brazil. E-mail: andre.ulguim@ufsm.br

Keywords

Survey on Rice Weed Management and Public and Private Consultant Characteristics in Southern Brazil

  • Bruno de Lima Fruet (a1), Aldo Merotto Junior (a2) and André da Rosa Ulguim (a3)

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