To attract black soldier fly, use foods that give off quite a strong smell. Rotting fish, chicken, bad eggs, old veggies are good attractants. This signals to the mother flies around your natural environment that there's good food for her babies. She'll then be naturally attracted to come.
Preparing the attractant
Black soldier flies like the smell of smelly foods or waste. In nature, they usually gather around quite a lot near outdoor toilets or waste piles. Or especially during the season when the fishermen dry their caught fish outside.
Similarly, you can use stuff like animal guts, organs, bad fermented foods, veggies or spent grains to attract them. The bodies of older BSF are a good attractant. It's advisable to pre-treat them with some enzyme or ferment them for 4-5 days before using. This helps eliminate the smell that many of us can't stand.
If you place the attractant outdoors, the smell may not last as long as the indoor cage. To make the attractant smell last for longer, put in some fish fins or again the dead black soldier fly bodies. That'll be really attractive & smelly.
Making the egg collectors
Black soldier flies usually like to lay eggs in the crevices of wood. This helps keep their eggs protected from other predators & keep them from drying out. To make the egg nests or collectors, you can use cardboard pieces, wood stacks, aquarium bio-balls or the craft wood sticks (or tongue depressors).
The good thing about using wood pieces is that you can re-use them many times for a long time. When it's time to collect the eggs, you can just take the whole stack and place it over the feeding bed prepared for the young hatchlings.
After you've made the stacks, place them adjacent to the food source you've prepared. BSF will lay eggs adjacent to the food source & not directly on it. So this is a good location to place your egg collectors.
Between each piece of wood stacked together, leave about 0.8-1 mm. If you have a steady stream of eggs to collect each day, it's good to color-code the stacks with some colored ties–each for one day of the week.
The environment around
If you place your attractant box outside, make sure the environment around it is quite clear. Or there's no trees with holes in the trunk around. These might distract the mother flies. She may lay the eggs there & not directly into your prepared stacks.
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