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In the adult stage, the moth is a small butterfly with a 10 mm body and a 16 mm wingspan. The base of the forewings is whitish-gray with dark spots; the tip is reddish-brown with coppery highlights, crisscrossed with irregular bands. The hind wings are silver-gray. The larva is a tiny caterpillar of 15 mm in length, whitish or pinkish with a brown head. Its colour varies according to the food it has ingested.
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How do you know if you have weevils?
There are several signs that may indicate the presence of weevils in your home:
- Insects Visible: Adult weevils are small brownish insects with elongated bodies, usually 2 to 4 mm long. You may see them in your cupboards, in the kitchen, or near food sources.
- Infested food products: If you see small holes in your food packages, or if you find insects inside your packages of cereals, flour, rice or other grain foods, it probably indicates an infestation of weevils.
- Larvae or cocoons: Weevils go through a larval stage before becoming adults. You might see these white larvae or the silk cocoons they spin in your food or on your pantry shelves.
- Powder or “flour”: Weevils often leave behind some sort of powder or “flour” as they feed and move around. If you notice this kind of residue in your cupboards or on your food, it is a potential sign of their presence.
- Unusual activity: If you see insects flying around your kitchen or coming out of your food packages, you most likely have a weevil infestation.
If you observe one or more of these signs, it is recommended that you call a professional to confirm the infestation and to help you remove the weevils from your home.
What attracts weevils?
Weevils are attracted primarily by food. They are particularly fond of cereals and grain products, but may also be attracted to other types of food. Here are some things that may attract them:
- Cereals: Weevils are most attracted to cereals such as wheat, corn, barley, oats and rice. They can infest grain bags stored in closets or grain bins.
- Grain products: Pasta, flour, bread and breakfast cereals can also attract weevils.
- Other foods: They may also be attracted to other types of food such as dried fruits, nuts, seeds and legumes.
- Heat and humidity: Weevils are attracted to warm and humid areas because these conditions favor their reproduction. This is why they are often found in kitchens and pantries.
To avoid a weevil infestation, be sure to store your food, especially grains and grain products, in airtight containers. Also, avoid storing large quantities of these foods for a long period of time. Finally, keep your kitchen and pantry clean and dry.
How do weevils enter house?
Weevils can enter a home in several ways.
- With purchases: Weevils may already be present in the food products you buy, especially if they are not stored properly. They are particularly common in grain products, such as rice, flour and cereals.
- Openings and cracks: Weevils can also enter through small openings and cracks in walls, windows or doors. They are very small and can squeeze through tiny spaces.
- Carried by other animals: Weevils can also be carried into your home by other animals, such as birds or rodents that may have picked them up in their fur or feathers.
- Infested items: Weevils can hide in furniture or decorative wood items you bring into your home.
Once inside, they look for food sources and can quickly reproduce and infest your home. That’s why it’s important to properly inspect the food you buy, seal any openings and cracks in your home, and keep your kitchen and pantry clean and dry.
When to treat the weevil?
The ideal time to treat a weevil infestation depends on several factors, but the general principle is to treat it as soon as possible after the infestation is detected. Here are some points to consider:
Early detection: Early treatment is crucial to prevent a significant infestation. Weevils reproduce quickly, and a small number of weevils can become a massive infestation in a short time.
Favourable conditions: Weevils are most active during warm, humid months. Therefore, if you detect an infestation during this period, it is recommended to act immediately.
Contaminated food: If you find weevils in your food, it is essential to remove them and treat the infestation immediately to prevent them from contaminating other products.
Treatment: Treatment usually consists of a combination of deep cleaning, the use of specific insecticides and, in some cases, a exterminator professional.
In conclusion, it is best to treat a weevil infestation as soon as you notice it to prevent damage to food and your home. If you have any doubts or questions, do not hesitate to consult a professional.

Name | Weevil |
---|---|
Class | Insects |
French name | Charançons |
Latin name | Curculionoidea |
Length | about 6 mm long |
Colour | Bright green or red, matte brown, black or beige |
Life | 2 to 4 months |
Description of the weevil
The white pine weevil is an insect that is rampant and causes a lot of damage to many conifer species. As an adult, this beetle is about 8mm (¼ inch) long. The upper part of its carapace is dark brown with white and yellowish spots. Like almost all weevils, its head is extended by a mouth organ called the rostrum very curved and very recognizable.
White pine weevil reproduction
The weevil goes through 4 life cycles:
- Egg,
- Larva,
- Nymph
- The adult stage.
Females lay 150-400 eggs in late April to early June in small notches in the bark of the pine or spruce leader.
The complete development cycle is about four months.
Living environment and potential damage
The white pine weevil can be interested in about twenty species of trees but it prefers white pine, jack pine and Scots pine, Norway spruce in eastern Canada. It has its favourites in Western Canada as well… They can cause much damage if their growth is not limited and monitored.
Hatching then larval state
- The hatching arrives two weeks after the laying. The larvae stay in groups to feed, marking the tree’s spire as they descend. It can be seen in the inner bark and between the wood and the bark.
- The damage inflicted prevents the circulation of the sap and causes the death of the stem after its deformation.
- Colonized trees lose the equivalent of several years of growth in height during the month and a half that the larvae feed.
Pupa then adult
The mature larvae build a pupal lodge in the stem to quietly transform into pupae. Adult in a month and a half during the summer, the weevil feeds on the branches of pines of its area, it will bury itself in a litter to spend the winter.
The damage caused by the white pine weevil is such that in Quebec, different tree species are chosen for reforestation projects. In western Canada, it is also known as the Engelmann spruce weevil and Sitka spruce weevil.