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Forestry 1976 49(2):143-152; doi:10.1093/forestry/49.2.143
© 1976 by Institute of Chartered Foresters
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Effect of Pre-sowing Moist-chilling Treatments on Seedbed Emergence of Sitka Spruce Seed Infected by Geniculodendron pyriforme, Salt

A. G. GORDON1, G. A. SALT2 and R. M. BROWN1

1Forest Research Station, Forestry Commission Alice Holt Lodge, Wrecclesham, Farnham, Surrey GU10 4LH
2Plant Pathology Department, Rothamsted Experimental Station Harpenden, Herts

Burial of seed in moist sand for several weeks during winter (pit stratification), and early sowing have been common practices in forest nurseries for breaking dormancy of conifer seed. However, in the experiments reported here the emergence of Sitka spruce was greatly reduced when seeds naturallly infected by Geniculodendron pyriforme, were moist-chilled for 6 weeks in a stratification pit or in moist sand in a refrigerator at about 4° C. Reduction in emergence was less when seed was refrigerated without sand (naked), and negligible when the seed was treated with Thiram or Captan before chilling. Sowing 6 weeks early produced erratic results, often giving fewer but larger seedlings. Moist-chilling of seed did not increase total emergence but normally made it 1–2 weeks earlier so that the seedlings were larger by autumn. Addition of extra water to the seedbeds did not increase emergence or growth, even in a dry season.


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