Likewise, pesticides with high K oc values are more likely to run off than leach. Nonpoint sources are broad, undefined areas in which pesticide residues are present. Figure 3 . Pesticides can enter water supplies from point sources or from nonpoint sources. Most pesticide contamination does not come from normal, correct usage.
Problems arise from misuse or careless handling.
A checklist is provided to use when applying any pesticide. Use this guideline to help safeguard water sources near your nursery operation. Evaluate the location of water sources. Read and follow pesticide label directions. When possible, use the pesticide with the least potential for surface runoff and leaching.