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Chlorosis of Douglas Fir
Authors: J.W. GilmourPublication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1954, Issue N.Z.J.For. 7(5) 1958, pp 94-106, Dec 1958
Publisher: New Zealand Institute of Forestry
Abstract: Chlorosis followed by stagnation of up to 80% of the newly established Douglas fir at Akatore, Berwick, and Herbert State Forests is described. Field investigations indicated that this condition was caused by the poor development of a particular type of mycorrhiza in the heavy clay soils occurring in these forests and in Milton nursery. Only stands established with Milton raised seedlings have been severely affected. Interim results from planting trials showed that Tapanui seedlings and Milton seedlings treated with duff in the field, were far superior to untreated Milton seedlings in transplantability and survival. Lack of mycorrhiza development in Milton nursery appeared to be due to the absence of proper inoculation, certain unfavourable nursery practices and possibly periodic anaerobic soil conditions