Effective control methods for the appearance of flies in winter

The previous article said "why there are still flies in the home in winter", mainly elaborated on the three ways of fly overwintering, namely pupae, larvae, and adults, and then this article continues to explain the relationship between wintering and temperature of houseflies, the wintering methods of different flies, and the control methods for wintering flies.

　　Pang Xiu's test results show that housefly eggs survive below 1 °C for less than 72 hours, survive at 4 °C for less than 100 hours, 3-year-old larvae survive less than 5 days at 1 to 3 °C, and pupae survive below 2 °C for less than 10 days. Adult flies survive less than 15 days at 3 to 5°C. According to the study of Danish scientist J. Kieidng, housefly eggs stop developing below 13 °C, larvae and pupae stop developing below 12 °C, and the lifespan of 4 insect states under 5 to 15 °C conditions is 0-20 days.

　　The temperature in northern China is up to 3 months long, the ground freezes 3 feet, and from the breeding ground of the housefly, it is impossible to find its living conditions from eggs to pupae in winter. In North China, the housefly is in the overwintering stage for 6 months from November to April, and adult flies that are active for feeding are not visible. From the perspective of life expectancy, there is no record of more than 6 months, according to the flight ability of houseflies 6~8km/h and the gradual migration of temperature changes, the migration and spread of houseflies should be considered. From central China to north China is calculated according to 1200km, the diffusion time is calculated according to 60 days, and the diffusion is 20km per day. Its diffusion is different from the one-time migration of armyworms, it is a gradual migration process of diffusion while propagating, from high density to low density. In China, the overwintering of houseflies can be imagined as winter breeding in the tropical regions of South China, where there are several insect states, and the spread of North China and Northeast China is the result of the spread of Central China.

　　Rearing at low temperatures and general wintering sites show that at lower temperatures, non-lethal temperatures range from 6 to 14 °C. As long as the food is provided to survive the adult flies, they can survive the cold winter. However, when the low temperature conditions (6-8 °C) when the housefly is hidden, stops eating, the fat body in the body increases, and the energy metabolized by the body is the body. It shows that in general, adult flies overwinter in a semi-dormant state. In the suitable temperature of 22 ~ 33 ° C, the food is sufficient in some workshops in the catering service industry. Adult flies, larvae and pupae of a larger number of houseflies can be found. It is explained that houseflies in suitable places continue to breed throughout the winter. This has important implications for its ethnic continuity.

Different flies "overwintering"

　　Generally speaking, the species of toilet flies, black flies and green flies are mostly overwintered in the larval state, and some species of city flies, stable flies, lilies and flies are mostly pupae overwintering, and stable rot flies, red-headed flies, and neolukuland voldemort flies can overwinter in the adult stage.

"Overwintering" fly control method

　　No matter what kind of insect state the flies overwinter, after a long winter, they will more or less die, especially in the pupae state or adult overwintering. Due to the very strong fecundity of flies, although the number of individuals surviving the winter is small, as long as there are suitable breeding conditions, the population density can quickly be restored to a considerable level.

　　For families

　　1. Family doors and windows should be installed with anti-fly curtains, screen doors and windows, which can effectively prevent flies from entering.

　　2. Prevent fly eggs from hatching in "stagnant water" and ensure that the sewer is unimpeded and the sink or gutter is not blocked.

　　3, indoor garbage should do a good job of garbage classification, timely cleaning, do not leave garbage indoors overnight.

　　4. For a small number of flies entering the room, they can be killed by physical methods such as fly shooting, fly extinguishing lamp, and electric fly shooting.

　　5. For indoor flies, drugs can also be used, that is, the use of tactile insecticidal water emulsion to kill. Touch kill knockdown is fast, and flies will die when they touch it.