3 2   mm . ▁An ten na e ▁are ▁fil iform . ▁Fore w ings ▁show ▁grey ish ▁ground ▁colour , ▁with ▁dark ▁brown ▁and ▁ash ▁brown ▁tras vers al ▁w avy ▁bands . ▁H ind w ings ▁are ▁pale ▁and ▁un mark ed . ▁The ▁lar va e ▁are ▁brown , ▁usually ▁with ▁a ▁w avy ▁white ▁line ▁on ▁the ▁sides . ▁ ▁Bi ology ▁ ▁There ▁are ▁two ▁gener ations ▁per ▁year , ▁as ▁this ▁species ▁is ▁b iv olt ine . ▁Ad ult s ▁emer ge ▁from ▁May ▁to ▁June ▁and ▁again ▁in ▁August . ▁The ▁second ▁generation ▁pup ate ▁in ▁the ▁ground ▁approximately ▁at ▁the ▁end ▁of ▁September . ▁The ▁pup a ▁over w inter s . ▁The ▁lar va e ▁feed ▁on ▁bar berry ▁shr ubs ▁( Ber ber is ) ▁from ▁July ▁to ▁October . ▁ ▁Human ▁relev ance ▁Bar berry ▁bush es , ▁on ▁which ▁the ▁lar va ▁exclus ively ▁feed , ▁were ▁mostly ▁elimin ated ▁by ▁far mers ▁in ▁the ▁United ▁Kingdom ▁because ▁they ▁can ▁act ▁as ▁a ▁host ▁to ▁a ▁rust ▁fung us ▁that ▁also ▁inf ect s ▁whe at . ▁R ust ▁resist ant ▁whe at ▁was ▁developed , ▁but ▁not ▁before ▁the ▁bar berry ▁shr ub ▁disappeared ▁from ▁most ▁of ▁Britain . ▁The ▁bar berry ▁car pet ▁moth ▁decl ined ▁in ▁parallel ▁with ▁the ▁decl ine ▁of ▁the ▁bush es ▁until ▁only ▁around ▁ten ▁colon ies ▁were ▁left ▁in ▁England . ▁ ▁Some ▁bar berry ▁car pet ▁moth s ▁were ▁re