If you've just completed your honey harvest for the year, you may have empty boxes of honeycomb to store. The bees invested a lot of work to produce this wax, work they can do only during a nectar flow (a time of mass flower blooming). Bees must eat 6 to 8 pounds of honey to produce just 1 pound of wax, so this is valuable stuff, and now is the time to protect your comb from wax moths!
Both the greater wax moth and the lesser wax moth coexist with bees and honeycomb in every part of the world. Bees from healthy hives will remove the moths' larvae as they find them, and wax moths will never be a problem in a strong, active hive. Wax moths are natures way of cleaning up weak and diseased hives. Wax moths find nutrition in the honey, pollen and debris left behind in used honeycomb. They seldom if ever attack pure wax cakes or new wax foundation. Wax moths target weak hives and stored, used honeycomb.
I've found 2 ways to store comb without chemicals. The best way is to freeze it. This kills all stages of the wax moth. I have 4 deep freezers dedicated to storing comb. Even so, some years I still don't have enough freezer space. A covered porch exposed to light and air but protected from rain is my next defense. Here I stack boxes half full of comb, leaving every other slot empty. Exposure to light discourages the wax moths and keeps my comb clean.