Effects of Heterodera fici on the Growth of Commercial Fig Seedings in Pots.

ture, only a few second-stage juveniles of M. incognita develop and reproduce. Inoculated tomato genotypes that had only a few egg masses on the average when exposed to continuous high soil temperature showed greater resistance under thermoperiodic conditions than tomato entries showing greater numbers of egg masses when exposed to continuous high soil temperature. T h e results suggest that metabolic mechanisms of resistance, such as those postulated to involve chlorogenic acid (7) or ascorbic acid (2), will fail to be inhibi ted by high daytime soil temperature if the plant is exposed to a nonstress soil temperature at night.