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.

Slight paleness due to moderate nutrition during fruit set

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

Interdonato lemon fruits exceed 200 grams

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.

Video

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

Video

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 intelligence tools for educational, informational, and technical communication purposes.

Educational and outreach activities carried out in collaboration with:

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