Shoot weights of peppermint in greenhouse pots infested with a single egg mass (300 eggs) were reduced by 23% after four months. Root weight was increased, but roots were shorter, thicker and brittle. These effects increased slightly with greater inoculum densities (Eshtiaghi, 1975). Galling often increases root weight at the expense of shoots, but the heavier root mass is still less functional than in noninfected plants. While concentrations of N, P, Mn, and Al decreased in infected shoots, Ca increased. Spearmint shoot weights at four months were reduced by 27% when rhizomes were planted into pots with 100 J2 (= 265/quart soil). Larger inoculum levels did not decrease yields further. Root weights were depressed by 18%, and severe galling occurred. However, except for reduced size and weight of shoots, plant tops appeared normal. Concentrations of N, P, Mg, Mn, Fe and Al were decreased in shoots. Reduction in plant nutrients in shoots is due to reduced plant uptake and to diversion of nutrients from shoots to roots and sites of nematode infection. Thus, tops may look nutrient stressed at high infestation levels.