Canne à sucre, herbicides et pollution des eaux à La Réunion : bilan et perspectives au terme de la première décennie de suivi

Abstract : In Reunion Island, water resources have been monitored for pesticides pollution since 1999. The BRGM, the French geological and hydrogeological survey, compiled data from three local agencies involved in water quality. The compilation included data from 247 sites monitored between May 1999 and January 2010. Positive results were found in 55% of the sites. Among the 398 substances checked, 73 were found and 65 were quantified: 35 of them were herbicides or herbicide degradates, and 17 were involved in sugarcane weeding. 1,811 results were positive, 1,407 results were quantified and 251 results had concentrations over the drinking water threshold (0.1 ppb). Sugarcane herbicides, including glyphosate, were responsible for 80% of the results over 0.1 ppb. Two sugarcane herbicides widely used in the past, atrazine and diuron, were responsible for 80 % of the quantified results and 67 % of the results over 0.1 ppb. Four herbicides currently in use have been found at concentrations over 0.1 ppb. They are being tested in laboratory by the BRGM in order to assess the pollution risks for groundwater when applied on some native soils.
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José Martin, Vincent Petit, Bertrand Aunay, Cyril Lucas, Ludovic Maillary. Canne à sucre, herbicides et pollution des eaux à La Réunion : bilan et perspectives au terme de la première décennie de suivi. 22e conférence du COLUMA, journées internationales sur la lutte contre les mauvaises herbes, AFPP, Dec 2013, Dijon, France. pp.CD. ⟨cirad-01023218⟩

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