EUTETRANYCHUS ORIENTALIS PDF

Taxonomic placing: Acari , Prostigmata , Tetranychoidea , Tetranychidae. Common name: Oriental spider mite, citrus brown mite. Geographical distribution: The oriental spider mite occurs in the eastern Mediterranean countries, in Asia from India to China and in most of Africa. Host plants: The oriental spider mite may develop on over two hundred host plants, mostly dicotyledons. Morphology: The adult female is about 0. Figure 1: A colony of Eutetranychus orientalis on a citrus leaf The male is reddish, smaller, its hysteronotum is pointed and the legs are longer than the body.

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Taxonomic placing: Acari , Prostigmata , Tetranychoidea , Tetranychidae. Common name: Oriental spider mite, citrus brown mite. Geographical distribution: The oriental spider mite occurs in the eastern Mediterranean countries, in Asia from India to China and in most of Africa.

Host plants: The oriental spider mite may develop on over two hundred host plants, mostly dicotyledons. Morphology: The adult female is about 0. Figure 1: A colony of Eutetranychus orientalis on a citrus leaf The male is reddish, smaller, its hysteronotum is pointed and the legs are longer than the body. The dorsal setae are short, spatulate and placed on small tubercles.

The rounded eggs are pale-brown. Life history: The mites colonize the upper side of leaves whereon their eggs are deposited along the midrib. Each female produces eggs during two-three weeks. The pest raises about 20 annual, largely overlapping generations. The Oriental spider mite is arrhenotokous , its sex ratio is usually 0. Economic importance: The oriental spider mite is an important pest of citrus , especially in drier areas.

It is the most persistent citrus pest in Upper Egypt and an occasional serious pest in the south of Israel. The mites colonize the upper side of leaves where they feed, and their damage develops as yellow-grey stippled spots which cause leaf wilting and drop. Reduced irrigation increases the damage. Lemon trees are more damaged than other citrus species and varieties, whereas oranges are little affected.

Management Chemical control: The oriental spider mite has not yet developed resistance to pesticides. Thus it may still be be controlled by commonly-used acaricides like amitraz and dicofol, the organotin fenbutatin oxide and even petroleum oils.

However, the pest seems to be less susceptible to some of these chemicals, and continuous monitoring for resistance is thus necessary. Biological control : The pest is attacked by many indigenous predatory mites of the families Phytoseiidae and Stigmaeidae.

The phytoseiid Euseius scutalis appears to regulate this pest in Jordan, but little is known about its specificity and the ability of other predators to reduce pest outbreak populations. References Klein, H. Contributions to the knowledge of the red spiders in Palestine.

The Oriental red spider, Anychus orientalis Zacher. Hadar 9: , Kaspi, R. Eds In Hebrew. Kamran, M. The spider mites of the genus Eutetranychus Banks Acari, Trombidiformes, Tetranychidae from Saudi Arabia: two new species, a re-description, and a key to the world species, ZooKeys Khanjani, M.

New spider mites Acari: Tetranychidae of the genera Paraplonobia and Eurytetranychus from Iran, and a description of all life stages of Eutetranychus orientalis Klein. Acarologia Momen, F. Suitability of the citrus brown mite, Eutetranychus orientalis as prey for nine species of phytoseiid mites Acari: Tetranychidae, Phytoseiidae.

Osman, M. Petroleum oils as a component of integrated pest management of phytophagous mites. Arab Journal of Scientific Research Tanigoshi, L. Euseius scutalis Athias-Henriot a predator of Eutetranychus orientalis Klein in Jordan: toxicity of some acaricides to E. Arab Journal of Plant Protection 8: Zaher, M. Survey of mites associated with citrus trees in Egypt and Gaza Strip.

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