Daphnia

Daphnia (Daphnia) belongs to the phylum Arthropoda, subphylum Crustacea, order Cladocera. These microscopic organisms, often called "water fleas," inhabit primarily freshwater bodies with stagnant water. While not traditional agricultural pests for terrestrial crops, their uncontrolled proliferation in hydroponic systems or aquatic nurseries can cause significant disruptions to the growth environment.

In the context of plant cultivation, Daphnia does not cause mechanical damage to plant tissues, as it feeds primarily on phytoplankton, bacteria, and suspended organic particles. However, at high population densities, Daphnia can filter out beneficial microorganisms and nutrients added to the nutrient solution, leading to environmental imbalance and stunting the growth of young aquatic plants.

The biology of Daphnia is characterized by a high rate of reproduction through parthenogenesis under favorable conditions. The life cycle involves the production of female offspring without male fertilization. When conditions deteriorate, such as temperature drops or reservoir drying, males appear and resting eggs (ephippia) are formed, capable of remaining viable in harsh environments for many years.

The "pest" potential of Daphnia in agrotechnical systems is primarily indirect. Massive growth of these crustaceans in hydroponic setups leads to the rapid depletion of the nutrient solution and changes in its turbidity, which complicates monitoring of the root system. Furthermore, dense swarms can clog filters, pipes, and nutrient delivery systems, disrupting the overall functionality of the infrastructure.

Control measures involve a comprehensive approach to maintaining the purity of nutrient solutions. It is recommended to utilize robust mechanical filtration systems and monitor fertilizer concentrations to prevent excessive organic buildup.

• Regular replacement of nutrient solutions.
• Installation of fine-mesh filters on pump inlets.
• Consistent monitoring of pH and light levels in reservoirs.
• Use of specialized biological or chemical agents that are safe for plants but effective in suppressing crustacean populations.