Common earthworm

Taxonomic position: The common earthworm (Lumbricus terrestris) belongs to the phylum Annelida, class Clitellata, order Haplotaxida, and family Lumbricidae. While often considered beneficial, their status as a pest is recognized in specific agricultural contexts, particularly within greenhouse production and nursery management.

Affected crops and damage types: This species frequently impacts young seedlings, greenhouse plants, and potted flowers. Damage occurs when worms consume delicate root hairs or disturb the soil structure around the root zone, leading to nutrient uptake inhibition, physiological stress, and sometimes the death of young seedlings.

Biology and lifecycle: Lumbricus terrestris is a hermaphroditic organism that deposits cocoons in moist, nutrient-rich soil. Their development is highly dependent on environmental conditions, including moisture levels and temperature. When organic matter is insufficient in confined greenhouse containers, they may turn to live plant tissues as a secondary food source.

Harmfulness: In controlled environments, high densities of earthworms can cause significant mechanical damage to root systems. Furthermore, their movement in restricted soil volumes can cause soil compaction or irregular aeration, which creates an entry point for root-rot pathogens and fungi, significantly reducing overall plant health.

Protection measures: Management involves using sterile potting mixes and high-quality organic substrates to prevent initial infestation. If necessary, soil management techniques such as solarization or steaming are recommended. Physical barriers, such as fine mesh screens, can also be utilized to prevent worms from entering pots, and mild biological controls can be applied to maintain safe population levels.