Agave

Agave spp.

1. Identification and origin

The genus Agave, described by Linnaeus, belongs to the family Asparagaceae, and is native to arid and semi-arid regions of North and Central America. The species are distributed mainly in Mexico and the south-western United States, and were later introduced into tropical, subtropical and Mediterranean areas of several continents. They are plants traditionally used for fibres, fermented beverages and ornamentation.

2. Economic importance

Agave species have growing economic relevance, especially in agricultural systems of dry regions. They are used in the production of fibres, fermentable sugars, traditional beverages and industrial products. Their ornamental use and their adaptation to conditions of low water availability increase the commercial interest in landscaping and soil recovery.

3. Botanical characterisation

Perennial succulent plants, generally forming rosettes of thick, rigid leaves with spiny margins. The leaves have a high water-storage capacity. The stem is reduced or underground. The inflorescence is terminal and large, emerging only once before the death of the plant (monocarpic). The fruits are capsules containing numerous seeds. There is great morphological variability among species.

4. Edaphoclimatic requirements

They prefer hot, dry climates with high light. They are highly tolerant of drought, but sensitive to waterlogging. They develop best in sandy, stony or well-drained soils with low to medium fertility. Compacted or moist soils favour root rots. The crop adapts well to arid and semi-arid environments.

5. Main pests

• Scale insects (Diaspididae, Pseudococcidae): cause weakening and favour sooty mould.
• Mites: cause discolouration and leaf damage.
• Specific weevils and borers: affect leaves, roots or the stem, depending on the species and region.
• Pests associated with water stress or poor drainage tend to intensify the damage.

6. Main diseases

• Root and collar rots caused by soil fungi, aggravated by excess moisture.
• Occasional leaf spots caused by opportunistic fungi.
• Rots in conditions of poor drainage.
• The incidence of diseases is generally low in dry, well-drained environments.

7. General cultural management

It includes establishment in well-drained soils, the choice of sites with high light, weed control, minimal irrigation only at establishment, pest monitoring and the removal of plants affected by rots. The crop requires low maintenance and adapts well to extensive systems. The use of healthy plants and the prevention of waterlogging are essential for the longevity of the plantation.

Bibliographic references

• Gentry, H. S. (1982). Agaves of Continental North America. University of Arizona Press.
• Nobel, P. S. (1988). Environmental Biology of Agaves and Cacti. Cambridge University Press.
• Nobel, P. S. (2010). Agaves: Living on the Edge. University of Arizona Press.
• FAO. Agave Production Systems. FAO technical documents.
• García‑Mendoza, A. J., & Chiang, F. (2003). Contributions to the taxonomy of Agave (Agavaceae). Instituto de Biología, UNAM.
• Valenzuela‑Zapata, A. G., & Nabhan, G. P. (2003). Tequila: A Natural and Cultural History. University of Arizona Press.