A nematode accumulation assay was used to monitor changes in the concentrations of attractants for Ditylenchus phyllobius within organs of Solanum elaeagnifolium during plant development. Most of the biomass of the plant was highly attractive throughout the season. Only flowers, fruit, and foliar apices were relatively unattractive. Attractant activity increased during plant development, and the greatest level of activity in stem tissues occurred in the bark. Weak activity in green berries was lost during ripening.
