THE INFLUENCE OF WEATHER ON THE FREQUENCY OF BEECH MAST YEARS IN ENGLAND

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Abstract
Latent root primordia form in lignified parts of new stems of Populus × robusta trees from early in July, as revealed by examination of bark rings. Such primordia, in the summer and autumn of their inception, cannot emerge as roots from stem cuttings placed in darkness. Older preformed root primordia can emerge in the following spring from cuttings maintained above 12°C throughout the winter. Provided that latent roots were sufficiently mature in the cortex the presence of buds and a period of chilling were other factors which increased emergence of such roots.

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