Diallate will be released to the environment during its application as a pre-emergence herbicide for field crops such as sugar beets, flax, lentels, and peas. Releases may also occur during formulation, transport, and storage. Diallate released to the atmosphere as aerosols or by volatilization from soil will be subject to gravitational settling and photodegradation. If released to water, a combination of adsorption to sediment, photodegradation and microbial degradation will occur but no experimental data applicable to natural systems are available. Only moderate bioconcentration in fish would be expected.
Human exposure is principally occupational.
The major routes of loss in decending order of importance are biodegradation, adsorption to soil, and volatilization . There is some evidence that microbial degradation is more dominant when adsorptive forces are weaker . The kinetics of diallate loss from soil is complex and appear to lie between first and second order . The only volatile degradation product is carbon dioxide . When applied to field plots in May, all the diallate was degraded within the growing season .