Incidence of Resin-Soaked Roots in Subsoiled Loblolly Pine Seed Orchards on Sandy Soils
Abstract:The root systems of 70 loblolly pines (Pinus taeda L.) from three subsoiled seed orchards were excavated to determine the association of subsoiling with the incidence of resin-soaked lateral roots. The number of lateral roots and the proportion of resin-soaked and healthy root tissue were recorded. Chips from the resin-soaked margin of lateral roots were incubated for 10 days at 24°C on two general media and two media selective for Heterobasidion annosum (Fr.) Bref. Verticicladiella procera Kend. was isolated from 30 percent of the declining/subsoiled trees at one seed orchard. Monilia spp. were also isolated. Of the lateral roots severed by subsoiling, 60 percent were resin-soaked from 10 to 45 cm in length.
Document Type: Journal Article
Affiliations: Associate Professor, Department of Plant Pathology and Physiology, Virginia Polytechnic Institute and State University, Blacksburg
Publication date: 1982-05-01
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