Population Dynamics of Eutetranychus orientalis (Klein) and Predacious Mites Associated with Three Citrus Varieties (Navel orange, Grapefruit, and Lemon) at El-Sharqia Governorate

Document Type : Original Article

Authors

1 Shora company for chemicals

2 Agric. Zoology and Nematology Dept., Faculty of Agriculture, AL- Azhar Univ., Egypt

3 Plant Protection Research Inst., National Research Centre, Dokki, Egypt

Abstract

This work was conducted to investigate the population dynamics of citrus brown mite, E. orientalis (Klein) on Navel orange, Grapefruit, and Lemon varieties at El-Sharqia Governorate during two successive years, from March 2017 to February, 2019. The obtained results showed that the population dynamics of citrus brown mite, E. orientalis has been varied based on host plant verity. Meanwhile, it has one annual peak in August on Navel orange with total numbers (931 & 884 individual) and on Lemon (305 & 324 individual) at average temperature (31.58 & 31. 9 C°) and relative humidity (56 & 59 %) in the first and second years, respectively. While the highest population number of the citrus brown mite species on Grapefruit was recorded (844 & 833 individual) in September at average temperature (29.77 & 30.37 C°) and relative humidity (57 & 60.4 %) respectively. On the other hand, the population of predacious mites, Euseius scutalis (Athias-Henriot) and Amblyseius (Typhlodromips) swirskii Athias was recorded on the three citrus verities: Navel orange, Grapefruit, and Lemon, one annual peak in November during the first year when the highest number of predators were (246, 248 and 111 individual, respectively) at average temperature 23.77 C° and relative humidity  63 %. While in the second year the number of predators was (276, 341, and 210 individuals, respectively) at average temperature 24.40C° and relative humidity 63.5%.

Keywords

Egyptian Academic Journal of Biological Sciences. A, Entomology
Volume 13, Issue 3
September 2020
Pages 47-56

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