I have collected Spruce cones from several places in Bucks this spring to see if Cydia strobilella emerges from them. Almost as an after-thought I picked up some from my back garden in Chorleywood. There is only one Spruce tree there and I have never caught this species with my home light-trap. Nevertheless, the bag of cones had only been brought indoors a few days ago but several individuals have already emerged. The caterpillar feeds on the seeds in the cones through autumn into spring. In my experience, once one hatches out the other individuals follow it pretty closely.