Generally, having maggots in a compost would not be a totally big issue. These little creatures are doing their part to help break down the organic matter. But they do gross out a lot of gardeners. But don't worry, there are good ways to deal with them. Even some of these grubs are beneficial & can be yummy treats for chickens.
What to do with the maggots in your compost
If you're worried about a fly invasion problem, then add some garden lime powder in your compost. This will help control the larvae growth & slow them down. In a couple of days, you'll see much fewer maggots wiggling around.
Try adding more browns to the compost like cardboard pieces, brown leaves or sawdust to help with the aeration & moisture. Keep the moisture down so the flies won't be tempted to lay their eggs there.
The flies like a moisture content around 70% or more, so any level lower than that might help. But don't go too dry because it may slow down the composting process. When you stop feeding the compost with greens like kitchen scraps, the maggot population will also naturally decrease.
If you don't want to kill the maggots, here are some ways to utilize them:
For pet feed
These little larvae are some of the most nutritional & delicious treats for many animals. If you enjoy fishing, don't kill the maggots. Collect them & use them as baits. Fish love these! When the larvae are submerged in water, they'll still be alive and wiggling for hours. Unlike some other insect baits like bee which stop moving when they're dipped in the water. This moving maggot bait is really an attraction point for the fish.
Also, if you raise chickens, feed the larvae to your guys and girls. Although some chickens may go 'Erhh, I'm not sure about that' when we first feed them with red worms, they'll come running for these larvae without any hesitation. Inside some grubs like the black soldier fly grubs, there's about 40-45% protein, plus calcium & phosphorous. This helps build the chick muscles, make beautiful smooth feathers & the best of all nourish healthy chickens.
Some people call the BSF maggots a million-pet feed. Because insects in nature are the natural food for animals. Hamsters, cats, reptiles, frogs, shrimps enjoy munching on these little guys. For cats or hamsters that get some of these treats, they'll develop smooth beautiful fur. In the end, people can save money on feed & get a renewable food source.
Why maggots appear
Houseflies, for example, love an environment that is wet or has a slightly stinky, putrid smell. They also do well in the lack of oxygen. This may suggest that the environment in your compost may be a bit too wet. Because of the excess moisture, it traps the oxygen, making the air around oxygen-lacking. The smelly smell may stem from the decomposing of high-protein or high-nitrogen stuff like meat, fish, diary, or too much green (grass clippings, young tender leaves). It creates an anaerobic environment that attracts houseflies, which give birth to maggots.
To fix this, pop in some cardboard or sawdust to absorb the moisture. Or let the fluid drain out of the drainage holes. You may also reduce the amount of fresh greens. Because those tend to hold & release quite a bit of moisture in the pile.
Leave out the milk, cheese or meat, especially if you're living in an apartment or condo, because these can stink really bad. Turning your compost once a week or every other week can also help with air circulation & get the compost done faster. A good terracotta pot can also help with getting oxygen in and out.
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