Effects of fertilization with ammonium sulphate and potassium sulphate on the development of Sphaeropsis sapinea in Corsican pine |
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| Authors: | M de Kam C M Versteegen J Van Den Burg D C Van Der Werf |
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| Institution: | (1)  De Dorschkamp Institute for Forestry and Urban Ecology (IBG-DLO), P.O. Box 23, 6700 AA Wageningen, the Netherlands |
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| Abstract: | Potted plants ofPinus nigra subsp.laricio were fertilized with ammonium sulphate (AS) and potassium sulphate (PS) each year during 3 consecutive years. The then 5-year-old plants were artificially inoculated withSphaeropsis sapinea. The fungus caused much bigger bark necroses in plants that had been fertilized with AS, than in plants fertilized with PS. It is concluded thatP. nigra growing in poor sandy soil becomes more susceptible toS. sapinea when fertilized with an excess of AS. This may explain partly the increased incidence ofS. sapinea inP. nigra stands in areas with a high rate of atmospheric NH4-deposition in the Netherlands. |
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| Keywords: | Diplodia pinea nitrogen deposition air pollution plant water potential Pinus nigra predisposition |
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