Phenological Response of Pear and Orange Trees to Air Temperature at Regions of Thessaly and Peloponnesus, Greece
This research assessed the phenological response of pear (Pyrus communis L. cv. Krystalli) and of orange (Citrus sinensis L. cv. Washington Navel) trees to air temperature at the regions of Kato Lechonia in Thessaly and at Agiorgitika, Ligourio and Amycles in Peloponnesus, Greece. Phenological observations took place in order to evaluate the start dates of various phenophases of the studied cultivars, from the “end of bud swelling” to the “fruit development” stages. Also, air temperature data were monitored from meteorological stations located near the experimental orchards. The results showed that the warmer conditions at Kato Lechonia in comparison with those of Agiorgitika caused an earlier appearance of pear tree phenophases. The timing of the “end of bud swelling” at Kato Lechonia and Agiorgitika correlated negatively with the air temperature of the late winter (February) as did the timing of “bud burst” and of “appearance of flower buds” at Kato Lechonia. As regards to the orange tree, similar phenological behavior during the examined period was observed between the regions of Ligourio and Amycles due to their “similar” thermal conditions.
KeywordsStart Date Malus Domestica Citrus Sinensis Pear Tree Phenological Observation
The authors thank the observers of the Peripheral Centers of Plant Protection and Quality Control of Volos and Nafplion for their valuable work regarding the pear and orange trees phenophases. Thanks are also due to the agronomists Mr. C. Pinnas, G. Zegginis and, Mrs. D. Balomenou of the aforementioned Centers of Volos and Nafplion, respectively for providing the phenological and meteorological data as well as the Hellenic National Meteorological Service for providing the meteorological data.
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