Chemoattraction of Normal and Echinostoma revolutum-Infected Helisoma trivolvis to Romaine Lettuce (Lactuca sativa longefolia)

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Abstract
The chemoattraction of uninfected planorbid snails, H. trivolvis, and those infected with larval stages of the trematode. E. revolutum, to boiled romaine lettuce (L. sativa longifolia) was studied for 1 h in Petri dish cultures containinig pond water. Snails that contacted the lettuce were considered attracted. Snails infected with E. revolutum larvae were not significantly attracted to the letttuce, whereas uninfected snails were. For uninfected snails, the hydrophilic lettuce fraction elicited a significantly greater total contact time than the lipophilic fraction. Uninfected snails responded by chemoklinotaxis within 2.5 cm of the lettuce.