 Along with the Lundy cabbage , Psylliodes luridipennis has been listed in the United Kingdom Biodiversity Action Plan , and an action plan for its conservation , along with the conservation of other endemic species , has been prepared . This plan revolves mostly around the control of Rhododendron ponticum , an alien species which threatens the Lundy cabbage . The beetle is threatened by fluctuating numbers of Lundy cabbages . Though it is quicker than P. napi to recolonise new growth after bad years for the cabbage , it is slower to recover than the cabbage itself . 
