Farkas, Á., & Orosz-Kovács, Z. (2000). Continuous and discontinuous nectar secretion in some pear cultivars. International Journal of Horticultural Science, 6(3), 77–79. https://doi.org/10.31421/IJHS/6/3/106
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Hourly nectar secretion was studied in five pear cultivars between 1997-1999. Some cultivars (e.g. ‘Csákvári téli') secreted nectar continuously during the whole day, offering both nectar and pollen for pollinating insects. Discontinuous secretion (e.g. cvs. ‘Viki', `Nyárig tartó 6/19') is less advantageous from the viewpoint of insect attraction. In some cases, however, discontinuity or continuity of nectar secretion varied even within a cultivar (e.g. 'Solymári cukor', ’Jó szürke’) in different years.