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девственный лес stresses
gen.	virgin forest; untrod forest; primaeval forest; untrodden forest
agric.	virgin growth
biotechn.	primary forest (лес, не несущий черты влияния человеческой деятельности)
ecol.	old growth forest; old growth; original forest; primal forest; primary forest; primeval forest; undisturbed forest; wild forest; indigenous forest; pristine wilderness (Andrey Truhachev)
forestr.	primordial forest; old-growth forest (MichaelBurov); overmature forest (MichaelBurov); over-mature forest (MichaelBurov); over mature forest (MichaelBurov); overripe forest (MichaelBurov); over-ripe forest (MichaelBurov); over ripe forest (MichaelBurov)
Makarov.	trackless forest
poetic	wildwood
tech.	prime forest
девственные леса
ecol.	undisturbed forests
forestr.	oldgrowth; primary forest

девственный лес: 9 phrases in 5 subjects

Australian	1
Forestry	2
Makarov	2
Technology	1
Wood processing	3