Threat: Grape phylloxera is regarded as the worst pest of grapevines, as there is no effective way of controlling it in ungrafted vines. Infested vines decline in vigour and can eventually die.
About the pest: Phylloxera is an aphid that lives on the roots of grapevines.
Spread: The pest is spread by the movement of infested grapevine, rootlings, equipment and soil from infested areas.
