A study of controllable "predator-prey" system parameters as a biological pest control method, demonstrated using lacewings and aphids

Mark Markov, Russian Federation 13-15

Field experiments were conducted to perform a comprehensive study and calculation of biological parameters when using the common lacewing for biologically fighting an insect pest, the aphid, in three temperature modes during different periods of seasonal larvae colonization—period 1 (11°C to 14°C), period 2 (19°C to 25°C), and period 3 (25°C to 35°C)—and in different environmental conditions: environment 1, a production environment at a horticultural enterprise; and environment 2, a garden on a household plot. Two groups of larvae were studied separately: those raised in a laboratory and those caught in a natural environment. Parameters of the "predator-prey" biological system were calculated as demonstrated by interrelations between lacewing larvae and aphids, including parameters of intake and biological efficiency of lacewing release according to average quantitative values for three aphid species as destroyed by three different ages of lacewing larvae. These interrelations were evaluated using the Lotka-Volterra mathematical model on the basis of calculation of the model parameters, which included intake ratios and the biological efficiency ratio of lacewing release, and were obtained during quantitative assessment of the research. Assessment and consideration of these parameters help in addressing stability and management issues in the agricultural ecosystem being studied.

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