Pesticide mismanagement potentially has high risks for farmers, households living in the community and the environment. In Papua New Guinea where farming is the primary occupation, there is evidence of dangerous herbicide application methods being used by coffee growers. Using original survey data for coffee smallholders from four provinces, we assess the factors driving farmers’ use of personal protective equipment when preparing and applying herbicides, and farmers’ disposal of agro- chemical containers. We control for households’ demographic variables and measure the impact of farmers’ training in pest and disease management. We use the special regressor method to estimate binary choice models featuring an endogenous binary regressor (training). Our results show that human capital (education) and training are important drivers of farmers’ pesticide-handling practices, with marginal effects estimated at 10 and 22 per cent, respectively.