Macrocheles robustulus

Macrocheles robustulus belongs to the family Macrochelidae (order Mesostigmata) and is globally recognized as a highly effective beneficial predatory mite. Unlike pests that damage crops, this organism serves as a biological control agent that resides in the upper layers of soil and organic growing media, actively managing populations of soil-dwelling pests.

The biology of this mite is characterized by a rapid development cycle, highly dependent on ambient temperature and soil moisture. Under optimal greenhouse conditions—typically between +20°C and +25°C—the mite population can expand quickly, ensuring a consistent presence of predators to suppress recurring outbreaks of target insects.

The primary diet of Macrocheles robustulus includes eggs and larvae of various small flies, specifically sciarids (fungus gnats) and ephydrids (shore flies). By preying on these larvae, the mites effectively stop the life cycle of pests before they can damage the delicate root systems of young vegetable or ornamental plants.

The economic value of using this predator is significant, as fungus gnat larvae often cause severe root stress and facilitate the entry of soil-borne pathogens. By integrating this mite into a greenhouse management program, growers reduce the reliance on soil-applied chemical insecticides, thereby promoting healthier plant growth and root development.

Effective management strategy involves several key steps:

• Regular application of mite populations according to crop risk assessments.
• Maintaining adequate soil moisture levels to support predator mobility.
• Using yellow sticky traps to monitor adult pest levels alongside biocontrol.
• Avoiding the application of broad-spectrum pesticides that are harmful to predatory mite populations.