I have a `SpatialPolygonsDataFrame` in R that I want to export to shapefile.  I used `writeOGR` to export but the cells with that contain text values with accents (é, è, à, ê, etc) are blank. When I export only the data slot as a `csv` file, the values are preserved. 


I have used the following when exporting: 

    writeOGR(obj=for.ana, dsn=".", layer="for_export",driver="ESRI Shapefile", encoding="UTF-8")

When I want to import a similar shapefile with French accents, I use the following code that works:

    readOGR(".","file", use_iconv=TRUE, encoding="UTF-8")

What is the equivalent code for exporting?

---------------------------
Details on file:

My data attributes have these properties

    > str(for.ana@data)
    'data.frame':   994 obs. of  14 variables:
     $ gr.for     : chr  "Peupleraie" "Érablière à sucre pure ou à feuillus" "Érablière à sucre pure ou à feuillus" "Érablière rouge" "Érablière rouge" ...
     $ SUP_nrm    : num  0.388 0.388 0.388 0.388 0.388 ...
     $ FORME_nrm  : num  0.413 0.632 0.444 0.75 0.464 ...
     $ RAR_nrm: num  0.116 0.116 0 0 0.116 ...

The only value that shows up in the exported file when I open it in `QGIS` is `Peupleraie` (i.e. the one without accents). 

Here is more information on the shapefile I want to export.

    new("SpatialPolygonsDataFrame"
        , data = structure(list(gr.for = c("Érablière à sucre pure ou à feuillus", 
    "Érablière à sucre pure ou à feuillus", "Érablière rouge", "Érablière rouge", 
    "Érablière à sucre pure ou à feuillus"), SUP_nrm = c(0.387667865408362, 
    0.387667865408362, 0.387667865408362, 0.387667865408362, 0.387667865408362
    ), FORME_nrm = c(0.41326538523008, 0.632328804567057, 0.444390436010826, 
    0.749753344765862, 0.46396738636008)), .Names = c("object_ID", 
    "gr.for", "SUP_nrm", "FORME_nrm"), row.names = c(175L, 150L, 
    671L, 522L, 168L), class = "data.frame")
        , polygons = list(<S4 object of class structure("Polygons", package = "sp")>, 
        <S4 object of class structure("Polygons", package = "sp")>, 
        <S4 object of class structure("Polygons", package = "sp")>, 
        <S4 object of class structure("Polygons", package = "sp")>, 
        <S4 object of class structure("Polygons", package = "sp")>)
        , plotOrder = c(4L, 2L, 5L, 3L, 1L)
        , bbox = structure(c(319443.511198756, 5046058.007804, 321702.427432819, 
    5048250.11169816), .Dim = c(2L, 2L), .Dimnames = list(c("x", 
    "y"), c("min", "max")))
        , proj4string = new("CRS"
        , projargs = "+proj=tmerc +lat_0=0 +lon_0=-73.5 +k=0.9999 +x_0=304800 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
    )
    )



(I can't share the shapefile because it is proprietary)