…The wood dust is powdery, but coarser than that made by powder post beetle larvae and more tightly packed ( see p. 128). Wood wasp exit holes in timber Woodwasps The exit holes have a diameter of up to 1 cm. They are circular, with completely smooth edges, and look as though they had been bored with a 10 mm drill. Wood wasps occur only in conifers, the larval tunnels being made in both sapwood and heartwood. The coarse wood dust is so tightly pac…
Search Results for: Lymexylon navale and larva
Methods of treatment in pest control
…eratures and will be killed in half an hour at 60° C this applies to eggs, larvae and adults. Thus, heating clothing will kill all vermin in it, and heating foodstuffs or wooden objects may also prove a rational method of treatment. 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…
Long-tailed Silverfish
…r intervals. In addition, small drops of poison should be placed in cracks and crevices and in dark places where long-tailed silverfish can reside. Good advice against long-tailed silverfish Some good advice to avoid getting long-tailed silverfish into your home is to keep an eye on the things you buy and bring into your home. Clothes that have been on holiday must be washed in a washing machine, groceries and packages you receive should be checke…
Mouse
…of all the destruction they cause and not just because the eat food stuff and candles. Beside eating from ones food stuff in the kitchen, the house mouse and the yellow-necked mouse can also bite in various textiles, such as curtains, padding, and bed linen, which is used in their nests. They do also gnaw in woodwork, which is used in their nests too. Not even cabels are safe; the house mouse and the yellow-necked mouse also bites into various el…
Flour moth in the industry
…fficulties 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 for dark corners of wherever they live. Therefore, the moth larva is rarely seen, as it simply digs deep into the stock of flour until it is fully grown. As a full-grown larva, it be…
Mealworm Beetle
…eetle belongs to the family of shadow beetles (Tenebrionidae). Both adults and larvae are nocturnal. The adult beetles can fly and can be experienced in the middle of summer. The adult female beetle lays about 200 eggs during its 2–4-month adult life. The eggs are laid in starchy products, such as flour, grain, bread, and cereals. It takes a long time for the mealworm to develop; the development from egg to larva and to adult beetles can vary betw…
Wasps
…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 few…
Bed bugs
…by body heat. They bite preferably on uncovered parts of the skin such as hands, arms, feet and neck, as opposed to fleas that often bites under close-fitting clothing. An adult bed bug eats 5-10 minutes and is then full. Then it pulls the proboscis back and crawls into hiding again. Here it sits and digests for a week until it gets hungry and crawls out from hiding again. People respond very differently to bed bug bites. Some people have severe r…
Wasps
…are occupied with reproduction while the workers build the nest, feed the larvae and defend the colony. Worker wasps are actually females with undeveloped reproductive organs. Unlike the honey bee, wasps have not developed methods of storing food for the winter, and in temperate regions their colonies only last for one season. Each colony starts to break up in the autumn, and the workers die of cold. However, before this happens new queens and ma…
Australian spider beetle
…le during the day. It is nocturnal and prefers to be active at night. Both larvae and the adult beetles all eat dried foods such as grains and bread products, cocoa, dried fruits, seeds, nuts, feathers, animal skin and dead insects. In heated houses, the beetles can have two to three generations in a year. Damage The Australian spider beetle can be an annoying guest to have in the home. Not only does it go into the cabbage and the contents of your…
Bread beetle
…and treats for signs so that any outbreak is not overlooked. Bread beetles and larvae can be killed by heating infected products at 60°C for about 10 minutes. It is also possible to get rid of the bread beetles by freezing, but it requires temperatures below -18°C for several days to get rid of all stages of the bread beetle, which is a lot more complicated. In addition, you can control the bread beetle with insect spray. Please note, however, tha…
Moths in the food industry
…egularly and thoroughly, as spilled food can be enough food for many moths and moth larvae. Control should be done quickly and effectively when moths are detected in the food industry. Control of moths in the food industry typically takes place with pesticides and other poisons, which will make a whole batch of food unsaleable, as it is impossible to prevent the pesticide from getting on finished products and raw materials. Treatment with phosphor…
Animals in timber
…d his home. Some of them are merely transferred from the forest as eggs or larvae, and cannot live in timber that has been worked. The species which had the most chance of survival, and which have become serious pests of timber, were those which could thrive in dry wood, for this is what is used in houses. In addition, there are several species which occur in places where timber structures have been damaged by damp and by fungus. Identification of…
Fur beetle
…indoors. A real sign of problems is when you observe several adult beetles and larvae in your home, including damage to your textiles, especially wool. If there are branches hanging over one’s roof where there are clear signs of bird nests, then remove the nest as soon as the chicks have flown from there. You treat against fur beetles, just as you treat against moths, by thoroughly cleaning the infested textiles. For certain types of wool, you can…
Brown dog tick
…suck blood, grow spherical and become light gray. They then leave the dog and seek refuge again, and over the next 23 days the brown dog tick changes skin and turns into a reddish-brown nymph with eight legs. After the transformation, it is time again to suck blood from a dog. This time the meal lasts for four to nine days, during which the nymph grows larger and again becomes gray and swollen. Once again, the tick leaves the dog and seeks refuge…
Faeces
…identify the species that has produced the faeces from their shape, colour and size, and from the conditions under which they were found. Spider faeces are greyish-white and liquid when deposited, and they occasionally contain the remains of the prey’s integument. They are found particularly under the webs, for example as spots on a window pane or as greyish stripes on walls. The faeces of spiders that live in houses are sometimes found behind pic…
Ticks
…ar by animal tracks. The development of the tick consists of three stages: larva, nymph, and adult. A blood meal is required at each stage. The total life cycle of ticks is typically two to five years. The larvae are just ½ mm and suck blood from mice. The nymphs are 1 mm long and suck blood from mice and larger mammals such as humans, foxes, deer, and dogs. Adult tick also sucks blood from larger mammals. The tick climbs into vegetation and grabs…
Rats
…tically omnivorous, they prefer cereal but they will just as well eat meat and can act as predators and even take chickens from chicken coops. The rats are particularly often found in stables, warehouses and homes. In cities there will be a constant population of brown rats in the sewer systems and invasions are often caused by “sewer rats” that come up through a breach. The brown rat is doing well in nature, in hedgerows, by streams and especiall…
Mole
…like Bornholm, Samsø, and Møn. A mole is an insectivore, just as hedgehogs and shrews, and it is something of a distinctive animal. Although they are useful in regards to the ecosystem, they can at the same time create a lot of damage in gardens and lawns, which is the most obvious reason why many people want to get rid of them. The mole is a powerful but annoying mammal, but useful, even when they leave molehills all over the place. The moles eat…
Flour moth in the household
…fficulties 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 for dark corners of wherever they live. Therefore, the moth larva is rarely seen, as it simply digs deep into the stock of flour until it is fully grown. As a full-grown larva, it be…
Moths in textiles
…here they are where fur moth larvae seek cracks and fissures in walls and moldings, so those areas should also be treated. Infested woolen clothes should be treated by washing and drying, as this will kill both the adult moths, eggs, and larvae. You can also dryclean the cloth. Remember not to use insect repellant directly on your clothing, as it may cause irritation. Adult moths that are flying around should be controlled with insect spray so tha…
Honeybees
…e insects that are winged, with almost glassy wings. The honeybee is brown and yellow and is almost furred on the front of the body. The workers will be between 12-13 mm long and the queen approx. 20 mm long. On the underside of the hind body, the bee has a series of glands from which it produces wax. It is this wax that is used to build new cells in the bees’ nest. Biology and behavior The bees are part of a highly developed organization that tog…
Bats
…are formed by a thin fold of skin that is located between the bat’s arm, hand, and fingers as well as the side and hind legs of its body and can be stretched out. There is also fly skin between the tail and the hind legs that continues all the way down to the feet. However, the feet are completely free of the skin. The feet have a completely different purpose, as the bat uses them when it hangs upside down and rests, or when it has to crawl aroun…
Head lice
…er 9-12 days after the female lice have hatched, she can even start mating and laying eggs. And until her death, she can lay between five and eight eggs a day. As described, lice can neither fly nor jump. But that does not mean that they cannot move quickly around the hair. For this purpose, they use their claws, which they use to hold on to the hair strands. Should the lice risk falling off its host, it can survive for about 48 hours before dying…
Drone fly larva
…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 remarkably like a honey bee (see p. 31). Some hoverfly larvae…
Merchant grain beetle
…grain beetles live in various grocery products, such as nuts, dried fruit and other dried and / or oily products. Appearance The merchant grain beetle grows to an average of 3 millimeters in length when fully grown. It has a warm, dark brown color all over its body and is very flat. It is longer than it is wide and has, as beetles typically do, six legs. As a larva, the merchant grain beetle larva has a yellowish-white color all over its body and…
Housefly
…ut 6-8 mm long. It can be recognized by the four black stripes on the back and black and orange parts at the hind body. The fly larva 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 2…
Pigeons
…d behavior The stray pigeons prefer to build their nests high up on ledges and the like. And they can manage with quite a bit of nesting material for the purpose. Often a pigeon nest consists only of a mixture of excrement and a bit of twigs or straw. And once a pair of pigeons have found a location, they like to fight a stubborn battle with beaks and claws to maintain it. A pigeon gets about 10 fly-ready cubs. The pigeon begins its egg laying in…
Cockroaches
…oaches are predominantly tropical animals, and kitchen cockroaches also demand heat and are not found outdoors. It is only during the last few hundred years they have gained a place in these latitudes. Earlier on our homes were too poorly heated. The German cockroach is not particular German, but Carl von Linné who named it Blatella germanica must have thought so. The first sign that you have cockroaches in your house is quite large, slightly flat…
Pigeon tick
…lived for a long period of time can therefore be hearths for pigeon ticks. And if the residence is abandoned, the pigeon ticks may find themselves searching for new hosts to spy on. It is therefore not without precedent that the pigeon ticks have sought further into the dwelling and possibly tried to bite sleeping people. However, human blood is not a good starting point for pigeons, as they can neither survive for long nor multiply on this type o…
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