d-Phenothrin is photolabile, i.e. the molecule easily decomposes in the presence of sunlight. The half-lives of d-Phenothrin in water in the presence of light range from 9.1 to 13.9 hours depending upon the location of the radiolabel. The degradation products of d-Phenothrin are nonpersistent. Moderately rapid aerobic and anaerobic soil degradation was found in the absence of sunlight. The half-lives for d-Phenothrin in aerobic soil ranged from 18.6 to 26.0 days, depending upon the location of the radiolabel.
In Soil and Water
d-Phenothrin is not readily transported from the site of application. Very little movement of d-Phenothrin and its degradation products from soil into plants or through soil columns was observed using radiolabeled material. d-Phenothrin hydrolyzes in water, or breaks down into lesser components, at pH of 9 or greater. d-Phenothrin does not bioaccumulate and is subject to both oxidation and cleavage of the ester linkage in biological systems.
On Nontarget Species
Studies conducted in the absence of sunlight found the 96 hour LC50 for fish ranged from 17 to 200 μg/liter. The 3-hour LC50 for daphnia was 25–50 mg/liter. The LD50 for bobwhite quail was greater than 2500 mg/kg body weight and the LD50 was 5000 ppm of diet for the bobwhite quail.