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Root rot in radiata pine seedlings can be controlled
Authors: Tony Reglinski, Mike Spiers, Joe Taylor, Margaret DickPublication: New Zealand Journal of Forestry, Volume N.Z.J.For. 2009, Issue N.Z.J.For. 54(4) 2010, pp 16-18, Jan 2010
Publisher: New Zealand Institute of Forestry
Abstract: Phytophthora root rot is an intractable disease affecting pine seedlings that can cause substantial losses in nursery production. In trials conducted over three seasons at Te Ngae Forest Nursery, Rotorua, foliar sprays with phosphorous acid before root pruning almost completely controlled root rot in radiata pine seedlings. Metalaxyl-M was ineffective when applied at seedling emergence and provided only moderate control when applied at root pruning. Other treatments, including Trichoderma spp., humate and lime, and methyl jasmonate were ineffective.