In 2 trials, TLm96values of 43 and 78 ppm Bayer 73 were recorded for non-fed 1st instar larvae ofS. fuscipennis. TLm96values of 30 and 33 ppm sodium pentachlorophenate were recorded for non-fedS. fuscipennislarvae. Larvae that had been fed prior to testing were far less resistant to both molluscicides. The TLm48value for non-fed 1st instar larvae ofDictyasp. was 35.5 ppm Bayer 73.