Silkworm caterpillars in western São Paulo are dying due to pesticide contamination from neighboring crops, leading to significant production losses. The breeders believe that the irregular aerial application of pesticides in sugarcane fields is causing this drift, which then contaminates the blackberry plantations used to feed the caterpillars. This issue threatens Brazil's position as the 6th largest silk producer in the world and could potentially change current pesticide use regulations. Over 150 pesticide derivatives have been identified in São Paulo, Paraná, and Mato Grosso do Sul, according to the Brazilian Silk Association (Abraseda).