Citrus macrophylla

Citrus macrophylla, commonly referred to as the alemow, belongs to the Rutaceae family. It is a vigorous, evergreen citrus species primarily cultivated as a high-quality rootstock for commercial citrus production, particularly for lemons and limes, due to its exceptional graft compatibility and growth rate.

Originating from the Philippines, this species has become a staple in tropical and subtropical citrus industries worldwide. Its natural hardiness and biological robustness make it a preferred choice for growers looking to maximize yield and plant longevity in varying orchard environments.

Botanically, Citrus macrophylla is distinguished by its large, leathery leaves with winged petioles and heavily thorned branches. The root system is notably aggressive and expansive, which allows the grafted scion to grow rapidly and withstand temporary stresses, making it highly valued in nursery management.

Agronomic requirements center on a warm climate with no frost exposure, as the plant is highly sensitive to freezing temperatures. It thrives in well-drained, fertile soil types and requires consistent irrigation and nutrient management to maintain its high physiological activity throughout the growing season.

While primarily used in rootstock propagation, the tree remains susceptible to specific pests and pathogens. Growers must monitor for the presence of the citrus nematode, scale insects, and aphids. Additionally, maintaining proper soil hygiene is crucial to prevent soil-borne diseases such as gummosis and phytophthora root rot.