Arachnida, Acari, Eriophyidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: the vine.
- There are 3 biological races of this mite which are distinguishable by the type of damage caused. One causes erinea (characteristic swellings), the other, the rolling up on the leaves and the last attacks the buds ("bud mite").
- Adult: the female overwinters, sheltered at the base of vine shoots.
- The number of annual generations is about 7.
- In a 1st phase of "reproduction", the adults leave their shelters and move towards the green part of the bud which may be attacked from stage C. When leaves appear, the 1st galls become visible (*) ; the mites invade the young tissues, causing the development of a charaterisitc coating essential for their development and reproduction (*) .
The 1st eggs appear at stage E, the 1st nymphs at stage F. At this stage, the first 2 to 3 leaves at the base of the vine shoot are strongly infested.
- Then comes the "migratrion" phase during which the 1st adults migrate towards the terminal bud, the new leaves of the small branch, then the axillary buds. This migration begins at the end of May, intensifies after flowering and carries on for 2 months.
- The return migration begins in August and ends in October-November. The adults leave the leaves and return to the overwintering places at the base of the vine shoot.
- The bites on the young leaves induce the appearance of typical more or less spatially separated swellings (*) covered on their lower side with a very dense white or pink then brown coating. This coating is formed by the hypertrophy of the leaf hairs.
- Other tissue (axillary buds, bracts, peduncles, young fruits) may be found to be infested before becoming free from the terminal bud (*) ; the petioles, the stems and the tendrils are sometimes covered with galls and the growth of the plant is impaired.
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