…deficient water and breathe air. When fully grown and ready to pupate, the larva, often known as a rat tail larva, creeps out on to the land and seeks a suit- able dry place in which to pupate. In so doing it may enter porches or cellars. The pupae are 10-12 mm long, grey-brown, almost oval, but they retain the long ‘tail’ and look somewhat like tiny grey mice. From the pupa emerges a hoverfly, but unlike those •already mentioned, this species is…
Search Results for: Dronefly larva
Fur beetle
…The larva of a fur beetle is unique in their appearance compared to other larvae. A typical larva is an elongated little creature that is white, yellowish, or beige. But a fur beetle larva has a brown color and is hairy. In the end, it has a hair-brush, which makes it easy to recognize, size wise they are up to 1 cm long. One can take the ordinary fur- or carpet beetle larvae as a brown carpet beetle larva, as they are related. The easiest way to…
Flour moth in the household
…nd other dry goods, depending on where their eggs have been laid. Then the larvae begin to spin silk threads. The flour moth larvae have a sticky web. It is this web that creates difficulties for the industry. The larva’s sticky silk attracts flour, dust, and the larva’s own excrement. This can give small pockets of extremely unsightly odor and contaminated flour. Both adult flour moth and their larvae will try to create a dark habitat or search f…
Life cycle
…stage is unknown, and the pre-larva does not leave the egg. Inside the pre-larva, a six-legged larva is developed. It is similar in appearance to adult fur mites. When hatching, the empty skin of the pre-larva is left inside the egg while the larva crawls out through the top of the egg. After a while, the larvae attach to a hair, the mouth opening is plugged shot and the larvae remains completely still while the next stage with eight legs develop…
Flour moth in the industry
…nd other dry goods, depending on where their eggs have been laid. Then the larvae begin to spin silk threads. The flour moth larvae have a sticky web. It is this web that creates difficulties for the industry. The larva’s sticky silk attracts flour, dust, and the larva’s own excrement. This can give small pockets of extremely unsightly odor and contaminated flour. Both adult flour moth and their larvae will try to create a dark habitat or search f…
Moths in textiles
…o eat as well as a steady temperature around 25 degrees. Both clothes moth larvae an fur moth larvae spin sticky threads, which protect the individual larva from drying out. This sticky web also helps to create a ‘tail’ of excrement, remnants of food and dirt. The larvae of the cloth moth move around whit this web is glued to the surface. The fur larva drags its web behind it in a tubular shape. Damage You know if you have moths in your textiles i…
Pale mottled willow
…it is a larva, it will be gray, brown, white and look like other butterfly larvae. Butterfly larvae have a main capsule, legs and what are called wart feet. Biology and behavior As mentioned, this larva is often found on or under different roofs, which gave it the name “roof worm”. It will typically be thatched roofs of straw. The reason why it is found here is that the “roof worm” lives on grass and hay and is therefore brought to the house with…
Australian spider beetle
…e the small, hatched larvae can feed on the surrounding material. Here the larvae have every opportunity to develop. The small larvae spin their own whitish cocoon in which they pupate. The cocoon has an almost tissue-paper-like appearance, and the webs of the larva can be seen as thin threads and spun cocoons in the infested area. The development from larva to fully adult thief beetle lasts about 3 to 4 months if the larva has good conditions e.g…
Trombiculosis
…40 micrometers and the internal channel is only 5-10 micrometers wide. The larva feeds on lymphatic and dissolved tissue through the stylostome. At the same time, the stylostome functions as an anchor to harvest mite larvae. The identification is ensured by placing the mites found on a microscope slide with a drop of Hoyer’s Medium for further examination in microscopes of high magnification. The animals can be easily be caught on a piece of adhes…
Pigeon tick
…for the first 2 to 10 days of its life. When it has finished its meal, the larva hides in hiding in a crack or crack no more than a few meters from the nest, where it moves to change skin. The larva goes through several stages – where it alternately seeks out its meals on the pigeon and seeks shelter to change skin – until it is finally fully developed as either a sexually mature male or female. If the larva ends up as a male, it only has to worry…
Mealworm Beetle
…emperature and humidity of the environment as well as the nutrition of the larva. The ideal temperature for the mealworms is 26 degrees. When the larva is fully developed, it will pupate. This stage lasts just two weeks, after which it is a fully grown mealworm beetle. You can of course find mealworms in grain and flour, but you can also observe them in sparrow nests, where they survive on wasted feed and they can easily hide in the nest. Damage M…
Destructive flour beetle
…alworm beetle, it is most likely a Destructive flour beetle. Likewise, the larva of the Destructive flour beetle can at times be mistaken with the larva of the mealworm beetle flour beetle, which is commonly called a mealworm. This is probably because the two species both belong to the same family, namely shadow beetles, also called Tenebrionidae. Biology and behavior Destructive flour beetle can become surprisingly old, in fact over three years….
Woodboring beetle
…les like temperature, humidity and the quality and nature of the wood. The larva will usually be fully grown after two or three years. Once the larva is fully developed, it will pupate, which happens in the fall, and within a few weeks, the pupa will have developed into an adult beetle. However, the beetle will remain inside the tree until May-June, and then it will emerge from the tree, through a characteristic fly hole of a diameter of 2-3 mm. T…
Bread beetle
…oduces from the food that surrounds it, and which is put together with the larva’s saliva. Here the larva stays for a couple of weeks until it turns into a beetle and gnaws itself out, leaving a fly hole of 1-2mm in the food. The development from egg to adult beetle lasts between 2 to 6 months, depending on the conditions. The warmer the temperatures, the faster the development. If the temperature is between 20-22 degrees, the development from egg…
Deathwatch beetle
…nature of the wood, the type of wood, humidity, and temperature. Once the larva has undergone its development, it will begin to pupate. This often happens in the month of July or August. After a few weeks in this condition, the larva is transformed into an adult deathwatch beetle. However, it does not move from its nest immediately, but stays inside the tree until the following spring, after which it gnaws out of the tree. The tree bears visible…
The hen flea
…f the adult fleas, which consists of undigested blood from birds. Once the larva has undergone its development, it spins a cocoon. In the cocoon, the larva undergoes its full transformation into a full-grown and sexually mature hen flea. A single bird’s nest can accommodate hundreds of cocoons with future generations of hen fleas. Under normal circumstances, the fleas break out of their cocoon in the month of April when the warmer temperatures occ…
Tanbark borer
…ing dust, which consists of the undigested parts of bark and wood from the larvae’s excrement. The larval development normally takes about 2 years. The adult larva pupates in an L-shaped passage of 2-3 centimeters, which it gnaws itself. Once the larva has gone through the process from larva to adult tanbark borer, it goes back through the pupae. It then gnaws its way through the bark of the tree, leaving an oval fly hole with smooth edges of abou…
House longhorn
…ature and the nutritional content of the timber. The average length of the larval life is probably about 3-4 years, but it can be much longer. The larva feeds mainly on the sapwood and often gnaws outwards towards the surface until only a thin papery layer separates it from the outside world. The house longhorn’s fly hole can be recognized by its irregular shape When fully grown it pupates in a special pupal chamber which is sealed with coarse chi…
House longhorn beetle
…ourney goes towards the outermost layer, which is the most nutritious. The larvae eat the layer without at the same time gnawing through the surface of the wood. After this, the larvae gnaw further inwards, but no further than to the very core of the pine tree, which they cannot digest. There are many factors that come into play in relation to the larval development process. Under normal circumstances, the development from egg to adult beetle will…
The harvest mite
…ther developmental stages are free-living predators that attack and suck out small insects and other mites. The harvest mite larva is a parasite of warm-blooded animals: rats, mice and birds. The larval stage cannot complete its development in humans, because we usually manage to scratch off the larva before it has time to eat. Larval bites are not felt. When bitten, a rash, Trombiculosis, occurs as the skin reacts to the mite saliva. The mites ca…
Dermestes lardarius
…e a consistent dark brown color on the body. However, the underside of the larvae is slightly lighter. The larvae are clearly articulated and have long bristles protruding from all its joints. The rear visible joint is equipped with two dark chitin hooks. The larva grows up to 13 mm long. Biology and behavior The Dermestes Lardarius belongs to a group of insects that specialize in cleaning up nature, feeding on the remains of animals and tissue. I…
Wharf borer Beatle
…es or tunnels, which is otherwise the custom for most of the tree-drilling larvae. Their development from larva to adult wharf borer beetle lasts between 1 to 3 years, depending on the conditions in the tree. Damage There is no doubt that wharf borer beetles can do great damage if they attack in the wrong places. It can for instance be an extremely difficult task if the beetles attack basements in houses located on framed wooden poles (piloting)….
Tetropium luridum
…tunnels, which have a diameter of up to 1.5 cm, are full of wood dust. The larva first gnaws 2-4 cm directly into the tree and then turns and follows the grain of the wood, the tunnel having a total length of 4-6 cm. Pupa passages from black spruce beetle, Tetropium castaneum var. luridum When fully grown the larva makes a slightly enlarged chamber, which it closes behind it with coarse wood fibres, and then pupates. When the adult beetle emerges…
Larder beetle larvae hairs.
…beetle larva has nasty hairs on the abdomen. (Peterson) Many of the beetle larvae that are common in Denmark, especially the larder beetle larvae (Dermestidae), have very crafty hair. Some larder beetle larvae have spines on their tale end. The spines end in something that resembles a harpoon with 4-6 long barbs and along the shaft are 30-40 shell crests of barbs facing upwards. If larder beetle larvae feel threatened by other bugs, they turn the…
Violet tanbark beetle
…lt to distinguish from each other, as they appear as pale, chubby, or flat larvae. In the front, the larvae are wider with a strong and dark cheekbone. An adult violet tanbark beetle is equipped with laying tubes at the rear end which is used to lay and place eggs in cracks and crevices. Biology and behavior This insect only lays its eggs in conifer, dead or demolished trees, still bark clad. The larvae live in the layer between the bark and the s…
Flour beetle
…ized by its lively behavior. Since the flour beetle is an insect, it has a larval stage. The flour beetle larvae are somewhat larger than an adult flour beetle, it can be 6 mm long. It is not only the size that differs. A larva of a flour beetle has a yellowish brown or beige color. Both front and hind are slightly darker. A flour beetle larva can also be taken as a worm with its chubby shape. Biology and behavior The confused flour beetle belongs…
Powderpost beetles
…fer fresh wood. The females lay up to 50 eggs in the trees pores. When the larva is fully developed, it gnaws below the surface of the tree, and where it pupates. Inside the pupa, the larva transforms into an adult powderpost beetle. The beetle leaves the tree through a small fly hole that is round and diameter vice about 1 mm. The larval passages are round and 1mm in diameter, they can go all ways into the tree. The drill flour is light, fine, an…
Human flea
…h jumps. As an insect, the human flea also has a larval stage. During this larval stage, one can recognize it by its completely white color. The larva can grow up to 5 mm long, so it is remarkably larger than an adult human flea. Biology and behavior Both males and females of this species feed on blood from their host or host animal. Therefore they also mate while they are on the host. When the female lays eggs, the eggs usually fall off the host,…
Small housefly
…equipped with six rows of thorny, thread-like attachments, which allow the larva to attach itself on several surfaces. However, it can often be difficult to find housefly larvae, as they are typically covered in dirt and sludge because of the attachments. Biology and behavior When the housefly lays its eggs, it is typically done in moist and filthy material such as manure or rotting plant parts. Inside, they can also lay eggs in drains from the ki…
Merchant grain beetle
…, as beetles typically do, six legs. As a larva, the merchant grain beetle larva has a yellowish-white color all over its body and a dark head. The larva becomes about 3 to 4 millimeters long. The merchant grain beetle is sometimes confused with the sawtoothed grain beetle, as the two species are closely related. However, there are easy ways to tell the difference between the two, for instance by keeping an eye on the behavior of the specific beet…
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