Abstract
THE development of Fragaria vesca L. var. semperflorens Duch. is very sensitive to day-length1. In short-day conditions the plants do not reach the reproductive stage. Days more than 12 hr. long are required. Short-day treatment also inhibits flower formation of Fragaria vesca plants which have previously reached the flowering stage in long-day conditions. During a season in the open field, the number of flowers found on such flowering plants varies according to the day-length as shown in Fig. 1. A maximum of flowers is found in the inflorescences growing during August–October, which have been initiated during June–July, in the longest days.
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