Chronic Toxicity and Chronic Effects
Part 2, Section 1: Pest Management
Using Pesticides Safely
Chronic toxicity and chronic effects
Any harmful effects that occur from repeated small doses over a period of time are called chronic effects. The chronic toxicity of a pesticide is determined by ovserving symptoms of test animals, which result from long-term exposure to the active ingredient. Some to the suspected chronic effects from exposure to certain pesticides include birth defects (teratogenesis); fetal toxicity (fetotoxic effects); production of tumors (oncogenesis); either benign (noncancerous) or malignant (cancerous/ carcinogenesis); genetic changes (mutagenesis); blood disorders (hemotoxic effects); and reproductive effects. The chronic toxicity of a pesticide is more difficult to determine through laboratory analysis than is acute toxicity. The product's MSDS also contains information regarding chronic symptoms of pesticide exposure.