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Nine treatments, arranged in a RCB design with 4 replications on 20m rows/plot, were all soiled applied and incorporated under black polyethylene mulch, prior to planting. The treatments were: methyl bromide (MB) 98 and 67 &amp; chloropicrin at 168 kgha -1 , metham sodium at 17 &amp; 34 1ha -1 , oxamyl at 1.6 &amp; 3.21 1ha -1 , fosthiazate 6.5 &amp; 13 kgha -1 , and a control. Four week-old `Crimson Sweet' watermelon  (Citrullus lanatus)  transplants were established 3 weeks after chemical applications were made. Soil samples were taken in the plastic row-middle, plastic edge, 30 cm off the plastic edge and 15, 30 &amp; 45 cm deep at each sampling location 3 and 6 weeks after transplanting. The presence of Root-knot Nematode, RKN,  (Meloidogyne spp. ) was established by using `Mountain Pride' tomato as a bioassay. Fruit size and total yield were recorded and the economic return for each control practice calculated. The 1.6 1ha-1 oxamyl plots yielded 6,832 kgha -1  more than the control which corresponds to a return of $183 for the investment of that control. The 3.2 1ha -1  plots had a yield increase of 7,728 kgha -1  and a return of $103, followed by, in order of yield response, 17 1ha -1  Metham plots, 18,592 kgha -1  &amp; $498, 34 1ha -1  Metham plots, 25,872 &amp; $693, MB 67 plots, 35,952 kgha -1  &amp; $752, and MB 98 plots, 37,072 kgha -1  &amp; $851.

290 COMPARING THE EFFICACY OF CHEMICAL CONTROLS FOR ROOT-KNOT NEMATODE ON WATERMELON