Effects of nematicides on populations of soil microflora and Pratylenchus penetrans, soil enzymes and flue‐cured tobacco
Abstract Field experiments were conducted on Fox loamy sand to study the effects of Telone C17, Vorlex, Vorlex CP, dazomet and fenamiphos on populations of Pratylenchus penetrans, soil microflora, on soil enzymes and growth of tobacco. Nematicides were applied on May 10, 1978 except fenamiphos, which was applied on May 16. With the exception of fenamiphos, the nematicide treatments increased the yield of tobacco. Crop index followed the pattern of the yield. No significant difference was observed in the grades of tobacco in all treatments. Chlorine content in the tobacco was significantly lower in the Vorlex, dazomet or fenamiphos treated samples than in the plots treated with Telone C17. The levels of total alkaloids and reducing sugars were similar in the treated and untreated plots. Nematicide treatments other than fenaminophos resulted in significantly lower nematode populations in ridged soils on May 23, June 13, and July 11, and in root samples on June 27 and July 11. The number of nematodes before ...