Abstract
ABSTRACT Urea rates of 0, 0.05, 0.10, 0.15, 0.20 and 0.25 g/plant were mixed with fixed rates of 0.5 g/plant and 0.06 g/plant single superphosphate (P205) and muriate of potash (MOP), respectively. Germinated seeds of three soybean cultivars: Samsoy-1 (highly susceptible to M. javanica), TGX 813-6D (moderately susceptible), and TGX 536.02D (highly resistant) were planted separately in potted clay loam soil and eighteen days later inoculated with M. javanica at 500 larvae/plant. As the rate of urea increased, galling decreased consistently in Samsoy-1 and TGX 813-6D cultivars. At rates between 0.15 and 0.25 g/plant, the two cultivars showed no root gall. The highly resistant TGX 536-02D cultivar showed no root gall at any urea rate.
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