The Plantation Corporation of Kerala Ltd (PCK) has been resorting to aerial spraying of the pesticide endosulfan for about 2 decades, 2 to 3 times an year, in 4696 ha of cashew plantation owned by it in Kasaragod district of Kerala for the control of tea-mosquito bug. From 1979, there have been press reports on health abnormalities in the region adjoining the plantation.