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The hyphae of Pleurotus ostreatus grow sparsely on water agar.  In the presence of nematodes the hyphae produce abundant secretory appendages that produce droplets of  a potent nematotoxin that paralyses the nematodes.  These droplets appear as little dark spheres and when a nematodes barges through a field of droplets it is paralysed within minutes  (click here).