Houseflies tend to move toward sunlight, so they will collect around doors and windows. Windows allow UVA light rays to penetrate, but block UVB rays, which may confuse the visual signals of flies or cause them to miscalculate what they are seeing. Insects are attracted towards natural light from window perceiveing it as way to get out.
The wire mesh or glass however prevent them to succeed. Sustained efforts over a time finish off reserve body fat and they die exhausted. This is the reason we see dead insects on window sills. As you know, house flies like to live off a liquid diet.
Because of this, their digestive system can move quite quickly, which means they defecate often. Birds and the bees. Why do they fly in squares? Beky Stoddart, London,UK Flies cannot fly in a curve, because they cannot move their wings at different speeds. Both wings are either 'on' or 'off'. To turn a corner, they turn the wings 'off' at an opportune moment and go into a momentary spinning freefall, turning the wings 'on' again when they are facing in the desired direction.
This is an error of perception, not a function of the flies, which rarely fly in a straight line, never mind turn corners. Ron Graves, Birkenhead England If they only fly in straight lines, how do they 'land' on ceilings? Nor do phorid flies have the fuzzy, moth-like bodies found on drain flies. And drain flies, since they prefer damp, dark locations, are almost always found near sink or floor drains—not usually the preferred location for phorid flies. Phorid flies include about 4, species of tiny flies within the Phoridae family.
Other precise identifying features are nearly impossible to spot by eye, given the fly's minuscule size, but these insects are notorious for feeding on decaying organic material, especially the corpses of animals. If small swarms of tiny flies appear at the same time as the suspicious odor of a decaying rodent, it is very likely you are seeing phorid flies.
This fly has also been known as the coffin fly because in years past it was sometimes seen in human coffins. Egg-to-adult reproduction for the phorid fly occurs in about 25 days or less. The cycle begins with adult flies laying eggs in decaying organic material.
In about 24 hours, the larvae emerge, then feed and grow for eight to 16 days before finding a dry spot in which to pupate. Within a few days, the pupae mature and emerge into adult insects. Phorid flies reproduce very quickly and will remain until the decaying material that provides them food and a breeding location are completely consumed. The very best solution for a phorid fly infestation is to locate and eliminate whatever decaying organic material being used by the flies to feed and breed.
But you can expect to have ongoing difficulties with phorid flies in areas where decaying organic material is common, such as around garbage cans or sewer floor drains.
Adult flies can be combatted with a contact spray containing pyrethrins. These pesticides use a natural compound derived from chrysanthemum flowers and will not harm pets or humans.
This substance is, however, toxic to fish, so it should not be used where runoff into rivers, lakes, and streams is possible. Pyrethrin is a contact killer only—the flies need to be hit with a direct spray. It doesn't do much to repel flies.
Bug lights " zappers " will also attract and kill adult phorid flies, along with other insects. These zappers can be somewhat annoying, however, as they cause insects to congregate wherever the appliance is positioned. Sticky pads or strips can be a useful method for trapping all manner of flies in areas where they habitually congregate, such as around garbage containers.
These products are coated with a sticky, waxy material and sweet-smelling bait; they hold the insects tight as soon as they alight. Birds and the bees. Marianne, Sydney Australia Cos if they walked they wouldn't be flies. Toby, Canterbury UK Because one wing is smaller than the other. Vincent Price, Canada Like vultures, they catch vortex-like thermals around lightbulbs that lift them up to the ceiling.
From this dizzy height they can scan the tabletops for succulent morsels of food. Richard Mauger, Bath Having never, to my knowledge, been circled by the same fly while in the open air, I assume it's because they are trying to get outside. Jay, Partick Scotland When looking for a mate, flies will gather around a noticeable landmark such as a bush or under a tree.
When indoors this is commonly under a lampshade or equivalent.
0コメント