I also experienced almost complete defoliation of two quite separate yet large patches of Lysimachia (Ottawa valley). In both these instances, however, the loosestrife was ciliata 'Firecracker'. I chose to simply whack both patches to ground level, ridding the garden of most and eliminating a food source for the rest. Like Annette's pilars they seemed to be specific to this plant. Subsequently, about a month later, one of these patches had sent up a new flush of foliage, to about a foot high, and was indeed flowering in a sporadic yet delightful fashion. I checked the above website and I do not think this to be the same creature - mine were a powder white, up to about 2 cm, curl and drop from plant quite readily if disturbed, hairless. Any ideas?
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