Dendrolaelaps acornutus

Systematic position: Dendrolaelaps acornutus belongs to the class Arachnida, order Mesostigmata, and family Digamasellidae. While many members of this group are predatory, this specific mite can cause significant damage in protected cultivation environments by feeding on plant tissues and facilitating secondary infections.

Crops affected: This pest primarily targets vegetable crops grown in greenhouses, such as cucumbers, tomatoes, and peppers. Furthermore, ornamental plants grown in organic peat-based substrates are highly susceptible if sanitary conditions are not strictly maintained within the root zone.

Biology and life cycle: The life cycle progresses through the egg, larva, protonymph, deutonymph, and adult stages. These mites thrive in high-humidity environments with ample organic matter. They are characterized by rapid reproduction rates, allowing the population density to escalate quickly in favorable greenhouse conditions.

Nature of damage and harm: The mite primarily attacks the root neck and root system of young plants. Feeding activities create entry points for soil-borne pathogens, leading to tissue decay and necrotic lesions. Affected plants exhibit yellowing, stunted growth, and sudden wilting, which can eventually lead to total crop failure if left unchecked.

Protection measures: Effective management relies on a combination of cultural and chemical practices:

• Sterilizing substrates and greenhouse equipment regularly.
• Monitoring the root zone for signs of mite colonization.
• Optimizing irrigation to prevent excessive soil moisture.
• Applying acaricides specifically labeled for greenhouse mite control.
• Utilizing biological control agents to keep pest populations at low levels.