Abstract
Abstract The leaf homogenate (LH) most toxic in soil to Pratylenchus penetrans (Cobb) Chitwood & Oteifa was of white pine (Pinus strobus L.). Other toxic LH were of dogwood (Cornus florida L.), red oak (Quercus borealis Michx. f. maxima (Marsh) Ashe, tobacco (Nicotiana tabacum L.), sunflower (Helianthus annuus L.), pachysandra (Pachysandra terminalis Sreb. & Zucc.), tomato (Lycopersicum esculentum Mill.), geranium (Geranium maculatum L.) and bluegrass (Poa pratensis L.). Sodium nitrate at 100 mg/kg of soil increased the toxicity of new pine needles and new oak leaves. Some LH were toxic in water but not in soil. Acetone powders of some tree leaves were toxic. Some products of decay or organic matter or closely related and easily available compounds were toxic to another nematode, Tylenchorhynchus dubius (Bütschl:) or stylet nematode.
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