Abstract
Over the past twenty years, the winter climate has shown a tendency to become progressively milder. We asked ourselves how a collection of apricot varieties, growing in a Mediterranean Tuscan coastal area, reacts to a strong reduction in the Chilling Unit accumulation as recorded during the last autumn-winter season. In the following spring, between March 1 st and April 10 th , on more than 200 apricot adult accessions, observations were conducted on the bud phenological stage evolution, amount of flowering and fruit set. The climatic trend for the year 2006-2007 allowed classifying the genotypes based on their yield response. Some genotypes coming from the southern Mediterranean area show the ability to heavy crop also under unusually mild winter conditions.
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