Gp. Cobb et al., UPTAKE, METABOLISM AND TOXICITY OF TERBUFOS IN THE EARTHWORM (LUMBRICUS-TERRESTRIS) EXPOSED TO COUNTER (R)-15G IN ARTIFICIAL SOILS, Environmental toxicology and chemistry, 14(2), 1995, pp. 279-285
Earthworms (Lumbricus terrestris) were exposed to COUNTER(R)-15G in ar
tificial soils for 32 d in four treatment blocks. Simulated rainfall a
nd temperatures were used to approximate conditions during planting ti
me in the U.S. corn belt. Maximum mean uptake of terbufos was noted on
the 8th d following pesticide treatment. Terbufos sulfoxide uptake by
earthworms was higher than terbufos uptake, and the concentration max
imum was observed on day-16 post-application. Maximum concentrations o
f terbufos sulfone were detected in earthworm tissues on day-32 post-a
pplication. No significant earthworm mortality was observed on any sin
gle collection date, but temporal differences in mortalities were note
d between control and treatment groups. Total concentrations of terbuf
os and oxidative metabolites in L. terrestris substantiate existing re
sidue data from field investigations.