RE: [APD] Aquatic Snail removal challenge

["Liz Wilhite" <liz_wilhite at hotmail_com>]

I might experiment with "Yandilla mustard meal" sold in Australia as slug 
killer, but I really mean experiment.  When wet, mustard meals releases 
isothiocyanates -- the same stuff that gives heat to horseradish and chinese 
mustard.  In small concentrations isothiocyanates kill slugs and snails, in 
somewhat higher concentrations they are herbicides, hence the reason for 
experimentation. (And a cupful of it could kill a fair sized group of 
people.) I know of experiments conducted in the US at University of Idaho on 
the efficacy of mustard meal as a slug killer, insecticide and herbicide.  
Generally, concentrations that kill slugs and snails *on dry land* do not 
affect plants but this might not translate to aquatic plants and snails due 
to possible heightened sensitvity on the part of plants or decreased 
sensitivity on the part of snails.  Mustard meal sprinkled on top of 
houseplants is the best fungus gnat killer around.

Liz


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