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Leaf roller
This pest is a beetle of the Byctiscus betulae species. It has the peculiarity of being able to roll the grapevine's leaf in the shape of a cigarette or cigar. This insect hibernates in the soil, either near the vines or under the trunk or branch rhytidome. By May, this blue, green or golden insect starts biting the grapevine’s leaves. After mating, the females make an incision in the leaf’s petiole in order for it to become flabby and able to be rolled in the shape of a cigarette. It is inside the leaf that the females will lay eggs (1 to 5 eggs). Later, the leaves end up drying and dropping.
Leaves:
- Bites on the leaves, usually in a straight line, at the start of flowering. - Characteristic rolling of leaves.
Chemical control:
- azinphos-methyl
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