All the exit-holes made by pests in timber on this- and the following pages are shown natural size. Chalcids’ exit holes in timber close to furniture beetle’s Chalcids The exit-holes have a diameter of less than 1 mm (see arrow). They are always found close to the holes made by furniture beetles, on which the chalcids live (see p. 152). Common furniture beetles The exit-holes have a diameter ol 1.5-2 mm. This furniture beetle occurs in many kinds…
Search Results for: The aphomia sociella moth and larva
House longhorn beetle
…milky white, but also has some dark chitin parts placed around its mouth. The larva is equipped with small legs that are barely visible to the naked eye. It can be up to 25 mm long. Biology and behavior The house longhorn beetle belongs to the family wooden bucks (Cerambycidae). It is rare to see the adult house longhorn beetle as they mostly stay in their hiding place in the tree. In the middle of summer, however, the beetles emerge to mate. But…
Methods of treatment in pest control
…. Cold At temperatures below 10° C most insects stop moving and developing and they cease to lay eggs. However, even lower temperatures are required to kill them, and there is considerable difference in the tolerance of the different species. Insects that are adapted to a temperate climate tolerate much lower temperatures in winter than those from the tropics (see p. 189). It is perhaps fortunate for man that a large number of household and foodst…
Long-tailed Silverfish
…hreads are far from as distinctive as those of the long-tailed silverfish, and they are at most half as long as the body itself. As mentioned, an adult long-tailed silverfish will be 15-19 mm long, while the nymphs are 2 mm when the egg hatches. Difference between long-tailed silverfish and silverfish There are very clear differences between long-tailed silverfish and silverfish when both are adults. However, it can be difficult to distinguish bet…
Wasps
…are seven different species of social wasp in Britain and northern Europe, and they all have the same general appearance with the black-yellow barring, and the same habits. The wasps usually seen in or near houses are the common wasp Vespula vulgaris, the German wasp, Vespula germanica, and the hornet Vespa erabro. In social wasps, as in many bees and ants, the characteristic feature is a division of labour within the colony. Among the wasps the q…
Flour moth in the industry
…rom America in 1877. The flour moth originates from somewhere between Asia and the Middle East, and it has since invaded mills, grain warehouses, and bakeries throughout Europe and North America. Flour moths is rarely a problem in private homes, but it can nonetheless be a problem in certain situations. Most often, the moths and moth larvae found in private homes are instead a two-colored seed moth. Flour moth is more often a problem in the indust…
Yellow shadow ant
…rk staining of delimited floor sections can be a good gossip handle for whether there should be an ant colony under the floorboards. At the trail of flying ants in the house, one should also be on guard. Control of the yellow shadow ant is best tackled by locating the ants’ nest and removing and destroying their nests. Here, a dark staining on the floor as described can be a good indicator. The infested woodwork as well as the nearby woodwork shou…
Wasps
…and she lays an egg in each. When the eggs hatch, she must fetch food for the larvae, and only after the first litter of workers hatches about a month later, the queen can relax and concentrate on laying eggs. The workers are now taking over the work of expanding the nest and fetch feed for the new larvae. It is a vulnerable period and if the weather is cold, many queens die before they are finished with the work, and that means a year with only…
Flour moth in the household
…rom America in 1877. The flour moth originates from somewhere between Asia and the Middle East, and it has since invaded mills, grain warehouses, and bakeries throughout Europe and North America. Flour moths is rarely a problem in private homes, but it can nonetheless be a problem in certain situations. Most often, the moths and moth larvae found in private homes are instead the Indianmeal moth. Flour moth is more often a problem in the industry….
Brown dog tick
…rance An adult brown dog tick grows between three to five millimeters long and the body is reddish brown. When the females have eaten and is filled with blood, they are almost one centimeter long and the body has a gray-blue color, while their hind bodies are swollen. The brown dog tick is equipped with two pairs of mouthparts with effective hooks, which help the tick to adhere to the host animal’s skin. The upper jaws of the tick are shaped like…
Bats
…common bats in Denmark are the dwarf bat, the southern bat, the water bat, and the mold bat, which are only found in North Zealand. The bat species are quite different. Some look almost like dogs, while others are small sizes at just 4-6 grams. In Denmark, some of the species are even vulnerable and endangered. In fact, all bats in this country are protected. Appearance The bat is, as described, the only mammal that can actively fly. The bat’s two…
Skin beetle
…idalis becomes about 7-9 millimeters long. Its body is almost boat-shaped, and the color is evenly black. On the underside of the body, however, the color is slightly different, as a series of small hairs gives the beetle an almost golden touch. The Dermestes haemorrhoidalis larvae have a dark brown body. The underside of the larva is also lighter, and here it is also clear to see the subdivisions of the underside, from which brown bristles stick…
Mouse
…types of mice that resides in houses. It is the house mouse, Mus musculus, and the yellow-necked mouse, Apodemus flavicollis. Although there are several species of mice in Denmark, they rarely enter one’s home, and if they do, they prefer to get outside again as they do not thrive indoor. The house mouse and the yellow-necked mouse can cause plenty of trouble, as they easily sneak in through small holes and overwinter in homes and other buildings,…
Animals in timber
…egard the process as injurious. Timber is, in fact, very poor in nutrient, and there are only a few organisms which digest its principal constituents, which are lignin and cellulose. The bacteria and fungi which live on wood produce digestive enzymes which are able to break down the lignin and cellulose to substances, such as various sugars, which can be absorbed as food. A few insects which feed on timber secrete the same kinds of digestive enzym…
The brown house moth
…feed. Appearance The brown house moth can grow up to 1.5 centimeters long. The moth has an almost bronze-brown color, while its forewings are characterized by some small dark spots that are quite clear in expression. The larvae of the brown house moth can grow up to 2 centimeters long. Their bodies have a whitish color, while their heads are dark brown. Biology and behavior When the female moth lays her eggs, she does so individually. And if she h…
Moths in textiles
…. These species are the clothing moth, also known as Tineola bisselliella, and the fur moth known as Tinea pellionella. One of these moths, the clothing moth, is believed to have arrived in United Kingdom during the 18th century, when heating in homes made it possible for the moth to survive the cold weather. Before heating, this moth kept more to the south, where the weather was hot and humid enough for them to survive. As danish homes were equip…
Woodboring beetle
…le family – more precisely Anobiidae. Appearance The beetle is 5-6 mm long and the color is black with strips on the cover wings. In addition, the beetles have a couple of spots of yellow silky hairs on the back corners of the chest. If you are in doubt of the species of a specific beetle, these yellow spots will be characteristic for the Hadrobregmus pertinax. Its head is hidden under the neck shield. The larva is c-shaped and is white with yello…
How to comb lice out of your hair
…ious”. And before long, the lice may have spread to the rest of the family and the rest of the circle of friends. So, it is never too early to start combing your hair. Continue combing your hair for at least 2 weeks Unfortunately, treatment against lice is not a one-time affair. It takes a lot of time and patience to get rid of lice. Therefore, it is also necessary to continue combing for a minimum of two weeks. During this period, at least four c…
Hercules ant
…herculeanus, is not very common in Denmark. It is only found in North Jutland and North Zealand, where it lives in the areas’ coniferous forests. Appearance Although the Hercules ant as described is the largest ant in Denmark, not all the species’ ants are the same size. The queen is barely two centimeters long, but the workers have to accept being somewhat more modest in size. The smallest working ants grow to about five millimeters, while the l…
Bread beetle
…arvae hatch, they leave circular holes in the material they have lived in. And these holes are confusingly like the holes in a tree that has hosted the borer beetle larvae. Bread beetles are not limited to one region, but are found all over the world. And often it is through shipping that the beetles are spread across the globe. Their history of shipping is not exactly good, as the bread beetles liked to be annoying and unwelcome guests on board t…
The itch mite
…gins. And in the following months until its death, it will work its way further and further in through the skin parallel to the skin surface. The itch mite only digs a few millimeters forward every day, but every day it lays 2-3 eggs in the skin at the same time. When the eggs hatch, the small larvae begin to dig their own small passages. The mating between the sexually mature male and female mites takes place in a fold of skin on the skin surface…
Housefly
…rva is white and have approximately the same length as the adult fly. When the larvae hatch from the egg, they enveloped in a pupa for a few days, where they develop into an adult housefly. After the pupa stage they move along walls and crack to a dark hole. In the dark hole, they develop and unfold their wings. After 24 hours, the flies can fly, eat, and mate. Biology and behavior The housefly often lives in places where there is fertilizer or ma…
Powderpost beetles
…they are 2.5 – 8.0 mm long, at the same time they are slightly flattened. The larvae can be 5-6 mm long, and these are yellowish white in color except the head, which has dark brown jaws and a yellow-brown head. Biology and behavior The two species are similar behaviorally vice. The powderpost beetle is a group of wood boring beetles, which worldwide includes 70 species. The common powderpost beetle (Lyctuc Linearis) is especially associated with…
Head lice
…n humans, there are three different types of lice that have adapted to us, and the head lice (Pediculus capitis) has gradually become a true classic that most people have become acquainted with during their lifetime. Appearance The head lice are a flat little insect with an oblong oval shape. They are quite small, and an adult louse grows only between two and three millimeters long. As it is often the case in the insect world, the male is slightly…
Brown carpet beetle
…eetle grows between 3 and 5 millimeters long. The brown color continues in the larvae of the brown carpet beetle. They have an almost golden brown color. At the back tip, they have a small hair tuft that has the shape of a brush. The larvae can grow up to 8 millimeters long. Biology and behavior The brown carpet beetle is a beetle in the subfamily (Attageninae), which all share the same common feature. They live on the dry remains of plants and an…
Soft wood boring beetle
…ondingly darker brown. The head is partially hidden under its neck shield. The larvae of the soft wood boring beetle can grow up to 8 millimeters long. They are curved and their legs are quite short. The bodies of the larvae have a yellowish-white color, while their heads are dark brown. Biology and behavior The soft wood boring beetle belongs to the family of borer beetles (Anobiidae) under the family soft borer beetle (Ernobiinae). Conifers are,…
White-shouldered house moth
…e moth can be recognized by its whitish or beige color. The head is white, and the sensory horns are long and curved. White-shouldered house moth moths have beige and brownish wings, but the chest, like the head, is completely white. In addition, a white-shouldered house moth has dark eyes, which are large and distinct. The white-shouldered house moth larva is reminiscent of a maggot in appearance. It is a whitish color in the body, while the head…
Australian spider beetle
…le also counts family members such as the common thief beetle (Ptinus fur) and the brass thief (Niptus hololeucus), both of which are common pest in Denmark. Appearance While the Australian spider beetle is still a larva, it can grow between 3 to 5 millimeters long. The larva has a curved shape with quite small legs and a dark head, while the rest of its body has a yellowish white hue. A fully developed Australian spider beetle is approximately 3…
Deathwatch beetle
…t deathwatch beetle larva grows about 1 centimeter long. The body shape of the larva is curved, and it is generally pale. However, its head is yellow-brown, while its jaws are dark brown. Biology and behavior In the period from March to June, it is mating time for the deathwatch beetle, and here it is noticed by a special kind of knocking. Through 6 to 8 quick knocks – which are repeated at short intervals – the two sexes signal to each other so t…
Wharf borer Beatle
…Nacerda melanura The wharf borer beetle belongs to the genus Oedemeridae, and the beetle is especially encountered along the Danish coasts and around the port cities. The wharf borer beetle is also called by its Latin name Nacerda melanura. There is a reason for the beetle’s name with maritime associations. Because it is not only in Denmark that the beetle prefers to settle in coastal and port areas. The beetle is widespread in similar places thr…
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