THE INFLUENCE OF SPRING AND FALL APPLICATION OF NEMATICIDES ON PRATYLENCHUS PENETRANS AND QUALITY OF FLUE-CURED TOBACCO GROWN WITH VARIOUS FORMS OF NITROGEN

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Abstract
Field experiments were conducted to determine the effect of two chlorinated hydrocarbon nematicides on control of the root lesion nematode Pratylenchus penetrans (Cobb) and on the yield and quality of flue-cured tobacco. The nematode was effectively controlled with a spring or fall application of either D-D or Telone. Fall application resulted in an increase in total nitrogen and total alkaloids and a decrease in reducing sugars and ethanol extractables in the cured tobacco leaf, effects which are associated with low quality. Evidence indicated that fall fumigation inhibited the nitrification of ammonium nitrogen fertilizer applied to the rye straw in the summer preceding the tobacco crop. Excessive amounts of mineral nitrogen became available to the tobacco plant during its growing season. Spring application increased the chlorine content of the leaf but had no other adverse effects on chemical composition.
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