The use of "losses to [causal agent]" is common, and will be readily understood by most speakers of English.
1954 Jrnl. Operations Res. Soc. Amer. 2 10 The actual figures were used from World War II campaigns for forces dispatched, aborts, losses to enemy aircraft and ground fire, operational losses, [etc.].
(From the cited source; quote via the OED.)
There are certainly more losses to diseases and pests today....
(From "Putting the Hive back to Mother Natures Height".)
The cursory research I completed suggests the uses are most common with reference to agricultural and husbandry losses, but as the first quote (above) suggests, the uses are by no means restricted to such losses.
Further research reveals that the construction is also common with reference to military losses, as suggested by Edwin Ashworth in the comments on your question and by the first quote I give above.