Abstract
In greenhouse pot culture over a 6-week period, population density of Pratylenchus penetrans declined pronouncedly both under Rudbeckia hirta alone and under a R. hirta - tomato combination, whereas tomato alone supported the nematode population. Population reduction is attributed in part to the known nematicidal effect of thiarubrine C in R. hirta. Overall, the presence of R. hirta in the tomato pot only slightly suppressed growth of either plant during the 6 weeks.
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