Abstract
The effect of
Tylenchorhynchus nudus
on growth of Kentucky bluegrass was investigated under controlled environmental conditions in both a phytotron and a greenhouse. The nematode significantly reduced weights of clippings, crowns and roots. Pathogenicity was greater in sandy loam soil than in loam and was enhanced by submitting plants to nutrient and/or moisture stresses; soil nutrient level was most critical. The results suggest that
T. nudus
contributes significantly to summer decline of bluegrass lawns in South Dakota.