Dynamics of three phytophagous mites Tetranychus urticae, Panonychus citri and Eutetranychus orientalis (Acari, Tetranychidae) on citrus in Tunisia

Abstract

Phytophagous mites of the family Tetranychidae are important pests of citrus in Tunisia, reducing the quality of the product in marketing value every year. In this study, the population dynamics of Tetranychus urticae, Panonychus citri and Eutetranychus orientalis were studied in the nursery and in the field from the beginning of February until the end of May. The results showed that the population dynamics of these three mites varied with temperature. The evolution of the T. urticae population showed three peaks in February, mid-March and April. In addition, the population of E. orientalis showed four peaks in February, March, April and May. For P. citri, this mite is active in winter and spring when climatic conditions are favourable for its development. Field monitoring has shown that the fauna of predatory mites linked to these three plant pests is diverse. Three species (Neoseiulus californicus, Phytoseiulus persimilis, Euseius stipulatus) of the phytoseiid family have been identified. Given the diversification of predatory mites and their importance in the regulation of phytophagous mites, it is necessary to favor biological control by conserving these species, for which it is important to reason chemical control.