COLOMERUS VITIS PDF

The populations of this species may be mixed, especially in Egypt, with those of Colomerus oculivitis Attiah. Taxonomic placing : Acari , Prostigmata , Eriophyoidea , Eriophyidae. Host plants : Grapevine Vitis vinifera L. Morphology : The body of the grape erineum mite is yellowish, about 0. The prodorsum bears a pair of forward-pointing setae and several weak, longitudinal ridges along its entire length. The featherclaw is five-rayed.

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The populations of this species may be mixed, especially in Egypt, with those of Colomerus oculivitis Attiah. Taxonomic placing : Acari , Prostigmata , Eriophyoidea , Eriophyidae. Host plants : Grapevine Vitis vinifera L. Morphology : The body of the grape erineum mite is yellowish, about 0. The prodorsum bears a pair of forward-pointing setae and several weak, longitudinal ridges along its entire length. The featherclaw is five-rayed. Life cycle : The mite lives on the lower side of grape leaves and in the buds, overwintering there and in bark crevices.

In the spring the mites move onto leaves as soon as they unfold and feed there, forming large colonies within the protective erineum. They may also be carried on the growing shoot from the bud, settling first in the basal buds, their numbers gradually diminishing in the more distant buds.

Dispersal between plants is by winds, insects and especially by transferring propagation canes from infested stock to new areas. A life cycle is completed in about a fortnight, and annual generations may be raised. Reproduction is by arrhenotoky ; spermatophores are deposited by males on the leaves and taken up by the females. Economic importance : This pest causes different forms of damage to the grape, believed to be due to different mite races.

Feeding on the lower leaf surfaces induces the appearance of white-grey patches, made up of unicellular hairs erineum that grow out of depressions between the veins, and corresponding blisters that bulge out of the upper leaf sides.

The patches later become brownish and may cover the entire leaf, leading to its premature drop. Such leaf damage is of economic importance only in nurseries, as it may retard plant growth.

Another form of injury is due to feeding in the buds each of which is a cluster of buds , resulting in deformations and stunting, and even death of buds. Finally, in heavy infestations the leaves curl, plant growth is retarded and yield is affected. Grape decline may continue for several years before the causative agent is discovered.

Pest damage to various grape varieties depends on the type of buds carried on the canes. When only the primary bud can be fruitful, mite damage is far more severe than if the lateral buds are also capable of producing fertile shoots. Cultural control : Mite numbers can be considerably reduced by careful, strain-dependent pruning, which requires prior knowledge about the distribution of the pest in the various buds.

Varieties whose buds are very tightly compressed can accommodate fewer mites and are therefore relatively undamaged by the pest.

Plant resistance : Varieties with higher levels of indol acetic acid IAA were found in Iran to be less affected by the mite than other varieties. Chemical control : Acaricides in common usage applied in the spring the only season when the pest is exposed , along with the pruning regime, may reduce injury. However, as damage is dependent on individual growth pattern, control decisions should individually be made for each variety, as well as according to the perceived damage - if any.

Biological control : Abroad C. Craemer, C. Frequent quarantine interception in South Africa of grapevine Colomerus species Trombidiformis: Prostigmata: Eriophyidae : taxonomical and distributional ambiguities. International Journal of Acarology 39 : Dennill, G. A pruning technique for saving vineyards severely infested by the grape bud mite Colomerus vitis Pagenstecher Eriophyidae. Crop Protection 10 : Dusso, C. Elsevier, Amsterdam. Harpaz, I. Occurrence of the bud mite strain of Eriophyes vitis Pgst.

Proceedings XI Congress of Entomology 2 : Khederi, S. Sources of resistance to the erineum strain of Colomerus vitis Acari: Eriophyidae in grapevine cultivars. Systematic and Applied Acarology 23 : Ocete, R. Les parasites des populations de la vigne sylvestre, Vitis vinifera silvestris Gmelin Hegi des Pyrenees Atlantiques France.

Vitis 34 : Colomerus vitis Pagenstecher The populations of this species may be mixed, especially in Egypt, with those of Colomerus oculivitis Attiah. Common name : Grape erineum mite. Host plants : Grapevines , Vitis vinifera. Geographical distribution : Almost wherever grapes are grown. Management Cultural control : Mite numbers can be considerably reduced by careful, strain-dependent pruning, which requires prior knowledge about the distribution of the pest in the various buds.

References Craemer, C.

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Colomerus vitis

Resistance of three grapevine cultivars to Grape Erineum Mite, Colomerus vitis Acari: Eriophyidae , in field conditions. Amrine, J. In : Lindquist, E. Avgin, S. Acarina: Eriophyidae on the yield and quality of grapes in Islahiye, Gaziantep.

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The present experiment was aimed at determining the influence of the grape erineum strain of Colomerus vitis GEM Acari: Eriophyidae on responses of local grapevine cultivars. GEM was applied at five density levels to each of five cultivars, i. The experiment was performed in a full factorial design 12 replicates each and effects of the mite on the relative content of leaf chlorophyll, internode and cane length, leaf area and weight, number and size of the erinea, and percentage of leaves with erinea were investigated. Also mite density on leaves and in buds was assessed. Data were analyzed with a two-way ANOVA followed by Tukey's test to separate means among treatment levels and cultivars.

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