These developments are reflected in the 4,4'-DDD concentrations of the single profiles (Fig. ). The increase after World War 2 is present in all studied lakes where the core covers this time period (except Lake AR which only shows one increase from 1970 and subsequent decrease after 1975). The main application period in the 1950s and 1960s is especially prominent in Lakes FH, BL, SL, OR, and even in the forest Lake ST. Probably as a result of the stepwise ban, concentrations are lower with the beginning of the 1970s in Lakes FH, BL and OR, while the latter is demonstrating a gradual decline. In some areas, local farmers or foresters might have resorted to applying higher rates than usual in order to dispose of their remainders of the soon banned pesticides. This in turn could have led to high concentrations in Lakes CR, PL and AR in the 1970s, and through them to the peak in Fig. . In other studies of lake sediments, the main peak of DDX concentration was also found in the mid-1960s to mid-1970s in European countries: GB , Germany ), Italy and Norway ), but also in several lakes throughout Canada ) and the USA (van Metre and Mahler 2005). The secret operation against the nun moth in 1983/1984 is impressively visible in Lake TF, and is indicated to a lesser extent in Lakes and .