Pesticide degradation within the plant is an important mechanism of detoxification. It helps reduce the hazard of residues in food. Aerial Movement Pesticide movement from soil to the atmosphere and atmosphere to soil occurs under many conditions. With aerial application, winds can carry the pesticide outside the target area. It may return to the earth's surface at places far from the point of application.
Pesticides move from soil into the atmosphere by volatilization and wind erosion.
Not all pesticides are subject to volatilization, but for a few this is a major pathway of loss from soil. Volatilization within a few hours after application can be substantial under warm and windy conditions but often can be reduced by incorporation of pesticides into soil. Leaching and Run-off Excessive rain or irrigation can cause pesticide leaching. Water that moves down through soil or through cracks and worm tunnels transports water soluble substances. The herbicides 2,4-D and Tordon are leached easily in soil.