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Tetranychus mcdanieli McGregor
Arachnida, Acari, Tetranychidae .

McDaniel spider mite

Description, Biology, Life Cycle, Damage, Common Names, Images

- Female: light orange (*) .
- Host plant: apple, plum, vine, ornamental plants, and more than 30 species of weeds.
- Described for the first time in the United States in 1931, its presence in Europe was detected in 1981; the cause of its introduction is unknown.
- The impregnated female spends the winter under the bark just under the canopy, or in twigs ripened by the August sun, at the level of the upper part of the trunk. It emerges in spring and immediately feeds on the vine buds, unlike the two-spotted spider mite (Tetranychus urticae).
- When the population density increases (in July-August), the spider mites migrate towards the peripheral branches; the whole plant takes on a brownish grey appearence.
- 7 to 9 generations a year.
- Duration of the life-cycle during the summer: 11 days.

Damages caused by this pest is very important, particularly when the hot and dry summer favours development of infestations.
The leaves are wowen together by the silk produced by the spider mite. The attack become evident by spots (due to the removal of chlorophyll), then - if it continues - the leaves turn red and drop. When the terminal leaves are attacked, they become wrinkled.

[R]Common Names
DE: McDaniell-Spinnmilbe ES: Acaro de McDaniel FR: Tétranyque de McDaniel IT: Ragnetto di McDaniel PT: Aranhiço de McDaniel GB: McDaniel spider mite

[R] Images

  1. Tetranychus mcdanieli McGregor (Rasplus J.-Y. / INRA Versailles)
    Colony Adults, immature motile stages and exuviae under leaf of vine leaf.
  2. Tetranychus mcdanieli McGregor (Cotton D. / INRA Montpellier)
    Female on bean

To read this page in French

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