Solution 1:

Adult breeding is the most crucial aspect of black soldier fly reproduction. The main problem faced by many people in breeding black water flies is the low mating rate, low mating quantity, and insufficient egg laying of adults, making it difficult to expand the population and ensure production and application. There are many factors that can cause low mating rates in adult insects, and different coping strategies should be chosen according to different situations.

Solution 2:

Insufficient lighting. Usually, long-term cloudy and rainy days lead to insufficient lighting, resulting in a low transaction rate. And the lifespan of adults is very short, and if it exceeds 4 days, they cannot mate. Some adults will lay unfertilized eggs or die directly. The requirement of light for adult black soldier flies is mandatory. The solution in the absence of light is to use artificial light sources as a supplement, such as the fly sun, which can replace sunlight for supplementary illumination. Utilizing the small sun of flies to supplement light is important for breeding wet manure in excess areas of southern China.

Low mating scheme diagram of adult black soldier fly

Solution 3:

Low environmental temperature is the most important issue limiting the breeding of black soldier flies in most regions of China. Because the mating requirements for adult black soldier flies are relatively high in temperature, if the highest temperature during the day is below 25 ℃, there will be no adult mating. We adopt diverse heating methods to address the low temperature. For example, by covering with insulation film and using artificial heating methods such as stoves, heaters, and air conditioning. In the northern regions of China, it is necessary to build insulated double-layer film greenhouses in winter to meet the conditions for adult breeding. The optimal temperature for sustained high-temperature activity of adult black soldier flies is 25-35 ℃. When the ambient temperature continues to exceed 35 ℃, it is easy to cause climate dryness, and most insects are prone to dehydration and death. The same applies to adult black soldier flies, which not only reduces their mating and egg laying rates, but also easily causes a large number of adult deaths. When the ambient temperature exceeds 35 ℃, it is necessary to cool down the adult activity area. Cooling is usually achieved by spraying clean water. Increasing the frequency of spraying water on leaves where adult insects are active can not only ensure that they absorb water and reduce insect mortality, but also effectively increase air humidity and lower local environmental temperature. Visit more plants in the cage to regulate the microclimate inside. In addition, by using the method of using air conditioning to move the fan for heat dissipation, the effect of installing a shading net on the top of the cage is very obvious in the afternoon when the light is too strong.

Solution 4:

The mating and egg laying of black soldier flies are more common when the air is too dry at a humidity of 70%. When the relative humidity in the environment is below 50%, adult mating will decrease, and adults are also prone to dehydration and death. It is a good way to add water to the adult cage spray every 1-2 hours by installing a timed spray in the cage room, which can not only increase the environmental humidity, but also add water to the adult cage. On the other hand, planting more green plants in adult breeding areas can significantly regulate local climate.

Solution 5:

The cage space is too small, and the adult size of the black water fly is relatively large. At the same time, the flight activity of the water fly is not as flexible as that of the house fly, and the activity in the small space is very poor. For example, when the volume of the insect chamber is less than 1 square meter, the adult's flight and mating activities are restricted, and the mating rate is very low. The selected cage size for simple production is 1.5 meters or more in length, width, and height. For example, a 2x2x2 cage is not only convenient for personnel to operate, but also has strong mobility for water flies and a sense of freedom for adults.

Solution 6:

Poor adult physique is crucial for obtaining high-quality breeding of black soldier fly larvae through wet manure cultivation. Many water flies make insufficient mistakes during the larval stage, resulting in insufficient accumulation of nutrients in their bodies. Adult individuals are small and have a short lifespan, making it impossible for them to mate and lay eggs normally. Usually, such adults are not suitable as seed insects. If such situations arise during production and it is necessary to use such populations for breeding, the solution can be to supplement nutrients to the adults. The specific method is to feed 10% brown sugar water or honey and spray it on the plant leaves inside the cage to attract adults to feed. It has been proven that feeding adults has a significant stimulating effect on mating and egg laying in populations with poor quality.

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