field trials of molluscicide (wl 8008) in bilharziasis control project area, in iran

field trials of molluscicide wl8008 (n-tritylmorpholine) were carried out in khuzestan, iran. the liquid 2 (fx/28), a 16.5 w/v emulsifiable concentrate in tetrachloroethylene in concentrations of 0.25 ppm and 0.5 ppm was used against bulinus truncatus and lymnaea gedrosiana in standing and running water systems . bio-assay tests and laboratory experiments were made parallel to the field trials. only a few of the b.truncatus were affected by 0.25 ppm of n-tritylmorpholine, but l.gedrosiana proved to be more susceptible to the chemical and an almost complete kill of l.gedrosiana was achieved. a concentration of 0.5 ppm completely killed both b.truncatus and l.gedrosiana, but had no effect on egg-masses. n-trityl-morpholine may play an important part in future snail control projects, particularly on lymnaea snails.