Abstract
Field experiments were conducted on Fox loamy sand to determine the relative efficacy of certain fumigant and non-fumigant nematicides against Pratylenchus penetrans in flue-cured tobacco (Nicotiana tabacum L.). Control of nematodes in the soil shortly after transplanting was better with the fumigants than with the non-fumigant nematicides, but the degree of control in the roots was about the same. Initial nematode population densities in the soil were similar in 1971 and 1972, but the crop responded to nematicide treatments only in 1972. The response differences were attributed mainly to weather conditions. It was not possible to relate final yields of flue-cured tobacco to degree of control of P. penetrans in either the soil or the roots at any one time during the growing season.
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