An aggregation first instar nymphs of the Green shield bug (Palomena prasina) [1] on Greater celandine (Chelidonium majus). First instars do not feed [2] and without any other information available I am not sure this is evidence of a direct plant relation.
Literature
1 Nederlands Soortenregister2 Jeffrey A. Lockwood, Richard N. Story, Adaptive Functions of Nymphal Aggregation in the Southern Green Stink Bug, Nezara viridula (L.) (Hemiptera: Pentatomidae) , Environmental Entomology, Volume 15, Issue 3, 1 June 1986, Pages 739–749, https://doi.org/10.1093/ee/15.3.739
