The responses of Mononchus aquaticus to chemicals and pH

Different concentrations of salts and furadan 3-G and pH gradients were used to determine their effects on the activity of the predatory nematode, Mononchus aquaticus. Except urea, the higher concentrations (0.06M) of all the other salts proved highly toxic and except for cupric sulfate and ammonia, the lower concentrations (0.001 M) had stimulating effect. Furadan 3-G proved very toxic, even at low concentration, suppressing activity much below control. pH 5.8 proved optimal for nematode activity. The effectiveness of salts, with some exceptions, was directly proportional to their molecular weight.