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Pecan tree [Carya illinoinensis (Wangenh.) K. Koch] is grown in Argentina since the mid-twentieth century. Due to dry fruits enlarged commercial interest in the last years, the pecan acreage increased significantly lately in our country. Pecan is a monoecious tree exhibiting dichogamy. The knowledge of floral behavior is essential for cultivar selection in less traditional areas, such as the north-central zone of Buenos Aires. The objective of this study was to establish moments of appearance and senescence of male and female flowers in young pecan trees, grown in the mentioned region. The trial was located in Navarro (Bs. As.), in a commercial plantation. The moment of appearance and senescence of the female and male flowers in four pecan cultivars, 'Stuart', 'Desirable', 'Shoshoni' and 'Pawnee', were determined, over three consecutive years. Preliminary results showed that both types of flowers were present for an average period of 10 weeks, from late September to early December. All cultivars showed bloom overlapping. This knowledge provides useful information to growers for cultivar selection, agrochemicals applications to avoid flower damages, and to obtain better fruit quality and yield. The information will also allow adjusting periods of pollen shedding and stigma receptivity considered key moments for the production of this crop.

Fenología del pecán: resultados preliminares sobre el comportamiento floral en el centro-norte de la provincia de Buenos Aires