Factors Influencing the Population Fluctuation of Pratylenchus penetrans in Soils of High Organic Content. I. Effect of Soil Fumigants and Different Crop Plants12

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Abstract
Seven selected fields situated near Newland, Indiana, were sampled at monthly intervals during 4 growing seasons to determine the population levels of Pratylenchus penetmns (Cobb) Filipjev and Stekhoven. During the course of the study several of the fields in which sampling sites were situated were treated at various times with I or more of the following nematicidal chemicals: D-D®(1,3-dichloropropene and 1,2-dichloropropane mixture) , Telone® (dichloropropenes mixture), or Vorlex® (mixture of dichloropropenes, dichloropropanes and related chlorinated C3 hydrocarbons plus methyl isothiocyanate). During the first and second growing seasons following fumigation, the P. penetrans population tended to remain low irrespective of crop grown. In the absence of this “fumigation effect” the nematode developed high populations on all crops grown in the rotations, which included onion, corn, potato, spearmint, and peppermint. In a greenhouse test potato, peppermint, onion, and corn were grown in soil naturally infested with P. penetrans at 2 different levels of infestation. In this test the smallest buildup of the nematode occurred on onion.

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