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Examination of the soil and root systems of 34 landscape-grown Japanese holly, (17 rated as healthy/17 as declining) was undertaken to determine the role of Thielaviopsis basicola and phytopathogenic nematodes in plant decline. One hundred roots per plant were cultured on carrot discs and the recovery of T. basicola was recorded. Soil was assayed for phytopathogenic nematodes and tested for P, K, Ca, Mg, soluble salts and pH. Thielaviopsis basicola was found to have colonized 33 of the 34 plants and the extent of occurrence was positively correlated with the presence of decline symptoms. Declining plants had a total of 34% of intact roots colonized while healthy plants had 17%. Only one plant had a significantly high number of nematodes. Nematodes, soil pH, soluble salts, P, K, Ca, and Mg were not correlated with decline.

Occurrence of Thielaviopsis basicola and Phytopathogenic Nematodes on Healthy and Declining Landscape-Grown Ilex crenata ‘Helleri’