Guillaume is 26 years old. He is a vineyard worker in Saône-et-Loire when he falls victim to mandatory insecticide treatments against the flavescence dorée leafhopper. Since it is impossible to make himself heard, he decides to quit his job and investigate the issue. He meets many people in the wine and scientific world, such as Emmanuel Giboulot, a winemaker who refused to treat with insecticides. Or Jean-Marc Bonmatin, a CNRS researcher and whistleblower on the catastrophic effects of the use of this type of pesticide on the environment. The couple Claude and Lydia Bourguignon provide him with a lot of information on the impact of these chemicals on soil fauna. Not everything is so bleak in this affair, because a collective of winemakers is trying to move the issue towards greater respect for the environment. This is an investigation of more than two years in which the young director of "La Clef des Terroirs" has engaged! This documentary society on pesticides in agriculture highlights the impact of the use of insecticides in the environment. Through the spectrum of organic winegrowers, organic farming and the world of organic wine, we become aware of the environmental issues that await us.