Interdonato Lemon in the “Sele” Plain: Production Hidden Among the Leaves
In July 2025, we return to the Interdonato lemon orchard that we visited between March and April, before flowering. From a distance, the fruit is barely visible: the lemons are still green and blend in with the leaves. As we move closer, however, we discover lemons that have already reached a good size, approximately three months before harvest.
The trees appear slightly yellowish. During fruit set, we deliberately limited nutritional inputs to avoid excessive vegetative growth. From mid-July onwards, we will gradually resume nutrition through fertigation and targeted foliar applications, based on the results of leaf analyses, to support fruit enlargement. This is a balance that requires careful management: young shoots can compete with developing fruit for resources, but nutritional deficiencies can also reduce the ability of the leaves to produce the sugars needed to support fruit development. The objective is to moderate vegetative vigour without weakening the tree. Study on fruit set in citrus
As the fruit develops, its
increasing weight causes the branches to bend. Along these curves, we observe
the emergence of new vegetative growth, which contributes to the renewal of the
productive canopy. Our task is to maintain a well-lit canopy while providing
sufficient space both for the lemons developing this season and for the new
vegetation that will contribute to future production.
In this orchard, the average
production observed is 70–80 kg per tree. With approximately 700 trees per
hectare, this corresponds to 450–500 quintals per hectare. These figures refer
specifically to this orchard and its management practices; they demonstrate the
production potential of a well-structured productive canopy.
Interdonato is an early-season
lemon. Here, harvesting generally begins in early October and continues
throughout the month. Along the Ionian coast of Messina, its area of origin,
harvesting can begin as early as late September. The fruit can exceed 200 grams
in weight, although at the beginning of autumn the peel will not necessarily
have the intense yellow colour characteristic of lemons harvested in winter.
The drop in temperature promotes chlorophyll degradation; therefore, peel
colour alone does not tell the whole story of fruit maturity. Study on lemon peel coloration
In this orchard, losses
attributed to mal secco have been kept low, at around 2%. A study conducted in
Sicily also classifies Interdonato among the lemon cultivars showing field
tolerance. The pathogen may be present, but the tree is able to maintain canopy
development. Tolerance, naturally, does not mean immunity. Study
on tolerance to mal secco
Editorial Note:
Original content by Agronomist
Dr. Vito Vitelli, developed and refined with the support of artificial
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