I 2016 gik langt flere enlige bier end sociale humlebier og honningbier i fælder opsat i æbletræer. Stort set alle de enlige bier var jordboende. Det stiller krav til redepladser, og her kan frugtavleren gøre noget for at forbedre forholdene
Far more solitary bees than social bumblebees and honeybees were caught in pan traps in apple trees in 2016. Virtually all the solitary bees were ground nesting bees.
Solitary bees require nesting sites and the fruit growers can do something to increase the number of sites