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Effects of Some Nitrogenous Materials and Wetting Agents on Survival in Soil of Lesion, Stylet, and Lance Nematodes. P. M. Miller, Department of Plant Pathology and Botany, The Connecticut Agricultural Experiment Station, New Haven 06504; Phytopathology 66:798-800. Accepted for publication 15 December 1975. DOI: 10.1094/Phyto-66-798.

Urea at 1.0 and 0.2 g/kg of soil was toxic to lesion nematodes (Pratylenchus penetrans), stylet nematodes (Tylenchorhynchus dubius), and lance nematodes (Hoplolaimus spp.). Chitin at 1.5 and 4.5 g/kg of soil and collagen at 4.5 g/kg of soil reduced nematode populations nearly 75%. Casein or casamino acids at 8 g/kg of soil were toxic to these three nematodes. Tween-20 at 1.0 and 0.3 ml/kg increased populations of lance nematodes, but reduced numbers of stylet and meadow nematodes. Surfactant-F at 1 ml/kg of soil increased populations of stylet nematodes, but decreased populations of meadow nematodes; at rates of 0.3 and 0.1 mg/kg of soil, however, it reduced populations of all three nematodes. Other treatments affected only one or two of the three nematodes.

Additional keywords: Pratylenchus penetrans, Hoplolaimus, Tylenchorhynchus.