1. Color differences:

Blow fly: looks like a mung bean and is customarily called a mung bean fly.

Red-headed fly: The head is red and the back is bright green.

2. Differences in evolution:

Blow fly: Mung bean fly is a kind of blowfly widely distributed in most parts of the world. Its scientific name is "mericia green fly".

Red-headed fly: The red-headed fly is domesticated from the green fly among wild flies and is commonly found in farmhouse toilets.

3. Differences in living habits:

Blow flies: Mung bean flies mostly feed on decaying organic matter. The adults are most sensitive to smelly fish meat, so they are common in environments with poor hygiene. Mung bean flies have licking and sucking mouthparts, which can contaminate food and spread diseases such as dysentery.

Red-headed flies: The larvae mainly feed on human and animal feces, and are more common in cesspools in rural toilets in summer.

Extended information:

Factors affecting the growth and development of larvae:

1. Temperature:

The temperature is directly related to the growth and development of fly maggots. Length of development time. The optimal environmental temperature (culture material temperature) is 34 to 40°C, and the development period can be shortened to 3 to 3.5 days; when the temperature is 25 to 30°C, the development period is 4 to 6 days; when the temperature is 20 to 25°C, the development period is It lasts 5 to 9 days; when the temperature is 16°C, the development period lasts for 17 to 19 days. The lowest temperature during the development period is 8 to 12°C, and if it is higher than 48°C, it will die prematurely.

2. Humidity:

(1) The suitable environmental humidity for 1st to 2nd instar fly maggots is 61 to 80, and the optimal humidity is 71 to 80. The 3rd instar fly maggots The most suitable environmental humidity is 61 to 70 degrees. If it exceeds 80 degrees, it will not be able to develop normally.

(2) It can be seen that the development of fly larvae requires a certain humidity, but higher is not always better. In production practice, the suitable humidity is 65 to 70 degrees; below 40 degrees, the development of fly maggots will be stagnant, pupation will be very rare, and even death of fly maggots will occur.

3. Ventilation:

Air circulation is beneficial to the growth and development of fly maggots. In garbage dumps, fly maggots are often distributed in corners and wall roots with large gaps.

Baidu Encyclopedia - Green Fly

Baidu Encyclopedia - Red-headed Fly