Population dynamics of certain mites infesting sugar beet at Beheira and Sharkia governorates in Egypt

الملخص EN

The population dynamics of the spider mite Tetranychus cucurbitacearum (Sayed) (Acari: Tetranychidae) and the predaceous mite Amblyseius swirskii Athias-Henriot (Acari:Phytoseiidae) associated with sugar beet plants, Beta vulgaris L.

were recorded at Nobaria and Diarb- Nigm districts in Beheira and Sharkia Governorates, respectively, in Egypt during two seasons 2016-2017 and 2017-2018.

The population of the mite T.

cucurbitacearum had five peaks at Sharkia and four peaks at Beheira during both seasons, showing a highly infestation on sugar beet at Sharkia compared to Beheira district.

The predaceous mite A.

swirskii had one peak in both Governorates during the two seasons.

Statistical analysis showed significant correlation coefficient between the population of T.

cucurbitacearum and temperature during both seasons at two Governorates and it was highly significant at the second season at Sharkia Governorate.