The Vine Leaf Blister Mite
The vine-leaf blister mite (Eriophyes vitis) is an exceedingly small mite, having a white elongated body hearing two pairs of legs situated near the front. The mite passes through the winter beneath the bud-scales and commences to feed on the under-surfaces of the young leaves in the spring. At first, the injury results in the production of small yellow areas on the under-surfaces of the leaves, but later these become brown and have a felt-like appearance. Raised blister-like areas develop on the upper surfaces of the leaves.
The mite breeds continuously during the spring, summer and autumn, many generations being produced in one year. Finally, the last generation of mites, which mature in the autumn, crawl under the bud scales and there pass the winter.
Generally speaking, this mite is not a serious pest, but if most of the leaves are attacked the cropping of the vines will he seriously affected and sunburn of the berries may occur.
Some wine grape varieties, such as White Shiraz and Rutherglen Tokay, and table grapes like Gordo Blanco and Black Muscat, are particularly susceptible to this pest, whereas sultanas and Zante current are not troubled. |
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