STIGMA RECEPTIVITY IS LIMITING FRUIT SET IN ALMOND IN WARM CLIMATES
The cause of erratic yields of two almond cultivars has been researched in order to recommend possible solutions. The lack of sufficient bloom overlap between Marcona and Fournat de Brézenaud in many years may be one reason for this erratic behaviour, but not the only one, as the same behaviour may be observed in two simultaneously blooming cultivars, Ferragnès and Ferraduel. The relatively high temperatures observed during the blooming period significantly reduced the stigma receptivity of these cultivars and, as a consequence, their effective pollination period, showing that stigma receptivity may be a limiting factor for fruit set in Marcona and Ferragnès resulting in their reduced yield under warm conditions. Thus, in the present context of global warming, the search for cultivars tolerant to heat stress during flowering will become important, as well as finding cultivars with the same chilling and heat requirements in order to ensure simultaneous bloom.
Kodad, O., Messaoudi, Z., Mamouni, A., Lahlou, M. and Socias i Company, R. (2013). STIGMA RECEPTIVITY IS LIMITING FRUIT SET IN ALMOND IN WARM CLIMATES. Acta Hortic. 976, 325-331
Prunus amygdalus Batsch., effective pollination period, temperature