the decisive environmental factors are favourable for the pest concerned and, where applicable, its vector, enabling it to survive periods of climatic stress and complete its life cycle;
go bhfuil na tosca cinntitheacha comhshaoil fabhrach don lotnaid lena mbaineann agus, nuair is infheidhme, a veicteoir, ag cur ar a cumas tréimhse brú aeráide a sheasamh agus a saolré a chur i gcrích;