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New Zealand Journal of Forestry (2010) 54(4): 16–18
©New Zealand Institute of Forestry

Refereed article
Root rot in radiata pine seedlings can be controlled

Tony Reglinski 1, Mike Spiers 1, Joe Taylor 1 and Margaret Dick 2

1 The New Zealand Institute for Plant & Food Research Limited, Ruakura
2 Scion, Rotorua

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.
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