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Trench inserts improve trenches for long-term control of oak wilt

Trench inserts improve trenches for long-term control of oak wilt

Phytopathology 91(6 Supplement): S95, June

Trenching to sever root connections between trees in advance of expanding oak wilt infection centers is the principal means for controlling short-distance spread (root transmission) of the oak wilt fungus, Ceratocystis fagacearum. Four trench insert materials, including water permeable Typar and Biobarrier, and water impermeable Geomembranes of two thicknesses, were tested for their long-term effectiveness in preventing root transmission. In the first few years following trenching, an abundance of adventitious roots commonly formed in the loose backfill soil from small roots (<2 cm) severed during trenching. Trench inserts did not significantly improve trenches during the first few years, but certain inserts did effectively improve trenches beyond the third year and extended trench longevity indefinitely. The water permeable inserts were more effective root barriers because they did not direct root growth along the face of the material following contact. The water impermeable inserts, however, did direct root growth, facilitating growth of roots under or over the material leading to root graft connections across the trench.

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Accession: 035985053

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