What are the difficulties and common problems in fly maggot farming?

1. Taming breeder flies is somewhat difficult and also takes a fairly long time.
The solution is: introduce stock directly.
2. Breeder flies do not lay eggs.
The breeder flies keep staying in the brighter areas and are unwilling to come down to eat, and they do not lay eggs or lay very few. The reasons for this are: first, mainly environmental factors, such as temperature being too low, light being too dim, unpleasant odors in the breeding room that flies dislike, food trays and sponges not being cleaned and thus giving off odors, the food fed to the flies having spoiled, the manure material not being fresh or being over-fermented, the egg-collecting material not being fresh, the breeder smoking in the maggot room, the breeder moving around the breeding room carelessly and shooing the flies, too many male flies and very few female flies, and so on. The solutions are: the temperature in the breeding room should be above 22°C and below 38°C, the light must not be too dim, other odors such as paint should be eliminated, food trays and sponges should be washed once every 2 days, sponges should be replaced with new ones every 20 days, fresh food should be used every day to feed the breeder flies, the manure material for raising maggots should preferably be fresh (within 3 days), the egg-collecting material should be mixed and used immediately, EM or substances flies dislike must not be added to the egg-collecting material, smoking is strictly forbidden in the breeding room, breeders or visitors entering the breeding room should walk gently, shooing or frightening the flies is strictly forbidden so the flies know we are not their enemies, and good manure material should be used to raise the maggots kept for breeding so as to ensure enough female breeder flies. Once the above problems are solved, it is very easy to get the flies to lay many eggs.
3. The maggots crawl out before they have grown up.
Under normal farming conditions, maggots crawl out of the manure pile only after they have grown and matured, but during farming, some crawl out before growing up, and a large mass of small maggots crawls around chaotically on top of the manure pile, unwilling to burrow into the manure pile to eat. The main reasons are: first, the temperature in the manure material is too low; when the manure material temperature is below 27°C, it is very hard for the maggots to absorb the nutrients in the manure material. If the manure material is not fresh or is over-fermented and no longer ferments after entering the maggot room, the temperature in the manure material is too low, and the maggots cannot absorb the nutrients in the manure pile, so they have no choice but to collectively crawl out of the manure pile to look for food. The solutions are: raise the temperature in the breeding room, and the temperature of the manure material will rise accordingly, so the nutrients can be absorbed by the maggots; place fresh manure material on top of the maggots that are crawling around everywhere, and the maggots will immediately burrow into the new manure material to feed; second, there are too many maggots and not enough manure material, the nutrients in the manure material have all been eaten by the maggots, and with no food left, the maggots have no choice but to come out and look for other food. The solution is simply to add new manure material. The above situations occur most often in spring and autumn.
4. The maggots do not self-separate or do not separate cleanly.
The principle of automatic separation is to make use of the physiological characteristics of maggots. After growing and maturing, maggots are about to pupate, but they all dislike pupating in the manure pile where they have been growing, so they crawl out of the manure pile, but they are blocked by the walls of the maggot-rearing pool, so they have no choice but to walk along the wall toward both sides. When they are almost at the maggot-collecting bucket, they encounter a tiny slope, and instead they scramble even more to climb up it. Just as they reach the edge of the maggot-collecting bucket, a sudden downward slope (maggots have no eyes) catches them off guard and they fall into the maggot-collecting bucket and can never climb out again. Sometimes, especially in winter and spring, the maggots are always found not to separate cleanly, and many maggots pupate in the manure. The reasons are: first, the temperature in the breeding room is too low, below 20°C, while the temperature in the manure pile is above 30°C, and as soon as the maggots crawl out they sense that the outside temperature will be unfavorable for pupation, so they have no choice but to pupate in the manure pile; second, the manure pile being farmed is too large, the maggots at the sides separate automatically, but the maggots living in the middle of the manure pile crawl for a long time without yet getting out of the manure, and having no eyes they think the manure pile is boundless, that further crawling is futile, and so they simply pupate in the manure pile; third, the frequent activity of the maggots loosens the manure and always ends up filling even the edges of the maggot-rearing pool with manure, so the maggots do not even have a “path” to crawl out. The solutions are: the time for automatic separation of maggots is from 3 to 9 o'clock, and the temperature during this period should be above 20°C, the manure weight in each maggot-rearing pool should be below 100 kg, and 2 to 3 times a day the manure material blocking the edge of the maggot-rearing pool should be shoveled to the middle so that the path along the wall of the maggot-rearing pool is unobstructed.