Abstract
Plant growth and yield variables of closely related resistant and susceptible lettuce cultivars (440-8 and Salinas, respectively) were compared in microplots at Davis, CA, in soil infested with Rhizomonas suberifaciens, the causal agent of corky root of lettuce. To validate the results for large scale lettuce production, the same variables were compared for 440-8 and Salinas in fumigated soil and soil naturally infested with R. subenfaciens at Salinas, CA. Most plant growth variables for 440-8 in infested microplots were not significantly different from those for 440-8 or Salinas in uninfested microplots (...)
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