Granary weevil Season for granary weevils Latin: Sitophilus granarius. The adult beetle is 2.5 to 5 mm long. The offspring is red-violet, and it later becomes brownish and old beetles are all black. It cannot fly. Its movements are quite slow and are somewhat similar to crayfish. In the winter cold storages, it is motionless and it becomes active when the temperature rises. The granary weevil does not live out in the open in Northern Europe. The…
Search Results for: Granary weevil
(7) The rice weevil and the granary weevil
…ice fields. It can fly and will often infest rice just before harvest. The granary weevil also lives in the tropics, but it cannot fly and is more common than the rice weevil as we approach the temperate zones. At our latitude, both of these granivorous insects are synanthrope. The rice weevil requires more heat than the granary weevil to develop and it is not as likely to survive cold winters. In Northern Europe almost all grain stores are infest…
Rice weevil
…ce wise, the rice weevil is like the grain snout beetle. However, the rice weevil is smaller. A rice weevil is in average 2.5 to 3.5 mm long so there is not talk of a very large beetle. It may also look like a corn snout beetle, as the two species, at first glance appears almost identical. A rice weevil has four red spots on the coverts. The hind and front body are more even in size than with other beetle species, which tend to have a larger hind…
Grain weevil
…nown pests when it comes to grain stocks, although one can also find grain weevils in the home. Grain weevil can enter your home via grain such as oats, barley, and wheat. However, one can also find them in dog biscuits, bird seeds, pasta, and other grain items. Grain weevil do not live outdoors in Denmark, so they will prefer to stay close to the food they know they can live on. In the summer, however, they can hike far from their safe areas, as…
The rice weevil
…evil Season for rice weevils Latin: Sitophilus oryzae. Very similar to the granary weevil, and you cannot tell the difference with the naked eye. With a little magnification however, it is possible to see that the rice weevil has four red spots on the elytrons. The rice weevil is on average slightly smaller and moves faster than the granary weevil. The rice weevil, unlike the granary weevil, flies, and in its natural habitats, in warm countries, i…
Index
…, rust-red Grain borer, lesser Granarium, Trogoderma Granarius, Sitophilus Granary weevil Grey flesh fly Haemorrhoidalis, Dermestes Ham beetle, black-legged Ham beetle, red-legged Hofmannophila pseudopretella Hololeucus, Niptus House cricket House fly House fly, lesser House moth, brown House dust mites House mite, common House mouse House sparrow Hymen optera Imaginary pests Indian meal moth Interpunctella, Plodia Jackdaws Khapra beetle Kuehniell…
The common bean weevil
…ort restrictions that apply to this entire family, see above. Common bean weevils are exterminated in the same manner as granary weevils….
Pine weevil
…ossibly attracted by the scents given off during the first few years. Pine weevil (left) can be confused with the Black vine weevil. Both have stains off yellow hair on the wings. The snout of the pine weevil is much longer. This species may easily be confused with the black vine-weevil (p. 203). Both are about the same size and have patches of yellow hairs on the elytra, but the snout is considerably larger in H. abietis. The Pine weevil is occas…
The corn weevil
…consider the two species to be one….
The coffee bean weevil
…ean roasting, and the damage done by these weevils should probably rather be considered from an economic perspective (weight loss during storage) than from hygienic-culinary beliefs. The coffee bean weevil is actually not a bean weevil, but belongs to a family that stands near the true weevils. Therefore, it is not subject to the restrictions relating to bean beetles….
Rice weevil
…(Latin: Sitophilus oryzae) This beetle is a little smaller than the grain weevil, and can be recognized by the four reddish spots on the elytra, which cover a pair of functional wings. Rice gnawed by rice weevil This is one of the most serious pests of cereal crops in the tropics and subtropics. It is often brought to northern Europe and is not uncommonly found in kitchen cupboards, usually in a packet of rice (see page 93). As in the grain weevi…
Nutmeg or coffee weevil
(Latin: Araeocerus fasciculatus) Coffee weevil aka. nutmeg weevil This beetle lacks the well-developed snout of the curculionid weevils. It is widespread in tropical and subtropical regions and is often brought to Europe in goods. It is now found quite commonly in Britain, mainly as a pest in cocoa beans, nutmegs and coffee beans. It has on occasions caused serious trouble to coffee exporters in south-east Asia. It requires warmth and a high humi…
True weevils snout beetles
…s or beans, but this is often irrelevant, because they do not thrive in mature dry seeds in a warehouse. Among the many weevils only three species are able to breed in stored foods: the granary weevil, the rice weevil and the corn weevil. They belong to the genus Sitophilus, but are often described under their old name: Calandra….
Common bean weevil
Common bean weevil (Latin: Acanthoscelides obtectus) This beetle mainly infests beans, but it may also occur in other related crops. It can lay eggs in fresh beans in the fields or in dried stored beans. The female lays several eggs in each bean. When the larvae are fully grown they gnaw their way out towards the surface of the bean and pupate, leaving a thin shell between themselves and the outside world. When the adult beetles are ready to emer…
Grain weevil
…lives a long time, at any rate until she has produced 200-300 eggs. Grain weevils can completely destroy a grain batch Grain weevils prefer wheat, rye and corn, but in default of these they may lay eggs in hard starch-containing products such as dry biscuits and pasta. The small larva has no limbs and cannot leave the grain. As it eats and grows the grain becomes a hollow husk by the time the larva is fully grown. It then pupates inside the husk…
Index
…septempunctata Cockroaches faeces scent Cocoa moth Codiosoma spadix Coffee weevil Coleoptera Collembola , Colletes daviesanus Columba livia domestica Common bean weevil Common clothes moth faeces Common cockroach Common flower bug Common furniture beetle Common gnat Common house mite Common house spider Common wasp Cone bug Coniophora cerebella Copeognatha Corvus monedula Corynetes coeruleus Cossus cossus Crab louse Cranefly larvae Crataerina pall…
Black vine-weevil
…Latin: Otiorrhynchus sulcatus) Black vine weevil This is one of the larger weevils. It moves around in a characteristic slow manner, and like all weevils it is vegetarian. The larvae live in the soil and feed on the underground parts of plants. The adults avoid the light and hide themselves during the day, often in the surface soil at the base of a plant, but they emerge at night to feed. They attack many different kinds of plant and may cause con…
Bean weevil
Latin: Acanthoscelides obtectus There are many different species within the bean beetle genus, which include Bruchus, Callosobruchus and Acanthoscelides. Common to them all is that they are serious pests. Especially in the warmer areas around the globe where they can ruin the harvest for the local farmers. The bean beetle originates from the tropical regions and is native to South America. But it is not unheard of for it to be shipped to other co…
Laboratory methods for detection of pests in food
…inspected every day. Staining: For detection of the “plugs” that rice and granary weevils close their egg holes with, use acid fuchsine in vinegar. It provides a red colour. A similar method uses UV alkaloid berberine, which gives the plugs a yellow-green fluorescence at 366 nm. Radiographs: Used for detection of cavities in cereal, macaroni, etc., in which gnawings and larvae can be seen. It takes some practice to interpret what you see. Uric ac…
Examination of raw materials and food on site
…s takes place a heavy perspiration. It may be a “warm pocket” with lots of granary weevils and other pests. In aerated flat storage, mites will be driven up to the surface when aerated from below. On the surface, they will form shapes following the most humid areas. These shapes are clearly visible as violet-gray dust piles. The colour is due to the reddish legs and gray-white bodies of flour mites. These shapes disappear when the aeration stops a…
B: The seed niche
…ain other moths. To them, flour, grains, baked goods and kernel damaged by granary weevils are just variations on the theme “damaged seeds.” The natural niches of these secondary grain pests are probably birds’ nests, where they feed on the spilled feed, when the birds feed their young. 2. Leguminous plant pests: Seeds of the pea family (peas, beans, lentils etc.) are infested mainly by the specialist species, bean weevils, which in warmer countri…
(5) The merchant grain beetle and the saw-toothed grain beetle
…found in unheated grain storages. In heated rooms, such as kitchens, the two species are equally frequent. In the Danish grain storages the saw-toothed grain beetle is particularly attached to warm areas that eventually occur around local granary weevil infestations. During the slightly warmer conditions in England, grain which is placed too warm can be strongly affected by saw-toothed grain beetles in a matter of weeks. This phenomenon is not kno…
Temperature
Fig. 3.6. The development time for granary weevil eggs, larvae and pupae at different temperatures. The form is basically the same for all insects and mites. Temperatures and time factors are different. It is old knowledge that flies in the kitchen like to sit on a warm stove. House flies prefer to sit on objects and surfaces where the temperature is about 35 ° C. All insects will, if they have the opportunity to choose, seek out a particular tem…
Bug Indentification
…ruitfly Fungus mite German cockroach with egg capsule Golden spider beetle Granary weevil Groundnut beetle Tysk kakerlak, hun Tysk kakerlak, han Ham beetle house fly pupa house longhorn house marten excrements House mouse excrements House rat excrement Indian meal moth and larva Jet black ant Khapra beetle and larva Larva from beetle Lesser grain borer Lesser house fly and larva Lesser mealworm beetle Maggot – Larva from blowfly Male odd beetle Od…
5. Non-chemical control measures
…layer, and when they lose water too quickly, they die. Against established granary weevil infestation in stored grain, diatomatic earth will not be the first choice because the larvae are securely protected in the kernels. For beetles and moths living freely between the kernels, the method provides good results. Mites, booklice, plaster beetles and brown house moths are dependent on a damp environment and are easiest fought by drying-out the premi…
Competition for food
…to pests, fungus and respiration which are difficult to separate as one often follow the other. In many development countries storage loss can exceed 50 %. In the USA the storage loss is 9 %. In Denmark the granary weevil causes a loss of stored grain at about 2 %, but usually this loss is noted as regular stock loss. Among other quantitatively important storage pests are rats, mice and birds….
The saw-toothed grain beetle
…ain beetle is practically only found in grain that already contain granary weevils. In such goods, weevils provide heat and damaged kernels which make it possible for the saw-toothed grain beetles to develop. Adult, pupa and larva of the saw-toothed grain beetle The optimal temperatures, which gives the shortest generation time is 31 to 34 ° C. At these temperatures, the number of the saw-toothed grain beetle in a population is increased by up to…
Some insects are unhealthy to eat
…did not lead to sickness when they ate living confused flower beetles and granary weevils. In this study, the psychological effect to eating pests must have had some effect on the results. It is a fact that pests in food and other places in the environment result in some degree of discomfort for many people. Bowel disorder can be the result of eating food that contains moth and beetle larvae, beetles and mites. This symptom is primarily the natur…
An old problem
…al with today in modern food storages. That includes, among other species, granary weevils, confused flour beetles, drugstore beetles, lesser grain borers, saw-toothed grain beetles, spider beetles and cigarette beetles. Our ancestors might have acted casually having beetles in their food, but they too had to take precautionary measures to ensure their own share of the food. In ancient Egypt and the Roman Empire, storage methods which prevented bo…
The brown rat
…ng and products, as well as contamination of food. There is no doubt that rats (and mice) are responsible for a large part of the food poisoning caused by Salmonella bacteria. The brown rat breed all year round. One pair of rats that are doing well in a granary or stable can in the course of a year produce 800 rats. Rats live in herds and they recognise each other by smell. The rats are shy animals that are primarily active during the dark hours….