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If you open the lid of the flour jar and see small worms crawling inside, it’s probably a grain weevil. Cereal weevils are actually small, reddish-brown, flying bugs. Since cereal weevils can lay several eggs a day for many months, you may have to deal with them for a while. Clean out the kitchen and store the flour in a hard, airtight container. It may take some time to get rid of all the cereal weevils eggs, but improving storage conditions in the kitchen will help prevent weevil growth.
Steps
Clean up and improve the kitchen environment
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Find the source of cereal weevils. Although able to fly, the cereal weevil prefers to be near a food source. If you see red-brown bugs in the flour, they may also be hiding in other foods in the kitchen. You need to check for grain weevils near your pet’s food dish as this can be a food source for weevils. Check for cereal weevils in: [1] X Research Source
- Grains (oats, rice, quinoa, rice bran)
- Crunchy biscuits
- Spices and herbs
- Dry pasta
- dried fruits
- Chocolate, candy and nuts
- Dried beans
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Throw away food with grain weevils. Although you can’t see weevil eggs in food, you will see adult cereal weevils. Check flour and kitchen foods for adult grain weevils and discard if present. If not, you can store and use flour or food.
- Do not eat any food containing live grain weevils. But if you accidentally bake a cake from flour that contains the grain weevils, you can eat the cake because the weevils are dead.
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Vacuum and clean the kitchen. Remove food from cupboards and use a vacuum cleaner to remove food debris or flour. Use a cloth dipped in soapy water to wipe down the entire kitchen cabinets and any food spills. If you see grain mites in other rooms of the house, you should also vacuum them thoroughly. [2] X Research Source
- Immediately empty the vacuum cleaner’s canister into a large outside trash can so that no grain weevils are left in the kitchen trash.
- There’s no need to use commercially available insecticides to kill grain beetles or kitchen moths if you clean your kitchen and eliminate their food source.
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Use white vinegar or eucalyptus oil to clean kitchen cabinets. After cleaning the kitchen cabinets, you should wipe down one more time the liquid that the grain moth hates. You can wipe the mixture of water and vinegar at a ratio of 1:1 or use eucalyptus oil. Just dilute the essential oil with a little water and spray it on the kitchen cabinets. [3] X Research Sources
- You can try using neem leaf, tea tree or pine essential oil to prevent cereal beetles from destroying the kitchen.
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Store all foods in hard, airtight containers. Because cereal beetles can eat through cardboard boxes or bags, you need to store food in hard plastic containers or airtight jars. If you’re buying baking powder (such as cake or muffin) you’ll need to check for grain moths and then put the dough in the container. Can be color coded or labeled on the container for ease of use. [4] X Research Sources
- Instructions for use on food packaging can be cut from cardboard and stored in a container in the kitchen.
Preventing cereal weevils
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Buy less flour. If you don’t use too much flour, consider buying small amounts of flour at a time. If flour is left unused for an extended period of time, weevils can lay eggs inside. The faster the flour is used, the fresher the flour and the less chance of contamination by weevils.
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Freeze flour. As soon as you bring it home, you should store the flour in a freezer bag and put it in the freezer for at least 1 week. This helps to kill the grain weevils or their eggs in the flour. You can then take the flour out and store it in a hard, airtight container or keep it in the freezer until you’re ready to use it. [5] X Research Sources
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Place fresh bay leaves in flour. Place a fresh bay leaf in each flour storage container or bag. Some people believe that bay leaves can prevent cereal weevils from causing damage. You need to replace the leaves every few months or when the smell of bay leaves no longer smells.
- Fresh bay leaves can be purchased at a farmer’s store, near a stall selling other fresh herbs.
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Use a Pheromone trap. You can buy small bags that trap grain weevils. These pouches use attractants to attract grain weevils and kitchen moths. The trap has a sticky space to trap kitchen pests. Place several trap bags throughout the kitchen and replace them each time they are full. [6] X Research Sources
- If the cereal weevils are overgrown (thousands of them crawling on floors and walls, for example), you should contact a pest control professional.
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Regularly check the kitchen for grain weevils. The kitchen should be checked every 1-2 months for grain weevils. This step is especially important because adult weevils can live for at least 1 year. Be sure to clear out hard-to-reach areas in the kitchen where weevils can start to thrive. [7] X Research Sources
- This is a good opportunity to clean out the kitchen cabinets again. Keeping the kitchen clean helps to prevent the return of cereal weevils.
Advice
- Do not throw grain-infested food in the kitchen. Take it outside and throw it in a large trash can to prevent the cereal weevils from continuing to wreak havoc in the kitchen.
- If you have just purchased flour and you find a grain bug inside, you should seal the bag of flour in an airtight container and return it to the store.
- If your cupboards have stickers, you should remove them before you clean them out, as cereal beetles can hide underneath.
Things you need
- Rigid, airtight container
- Vacuum cleaner
- Piece of cloth
- Dish soap
- Eucalyptus oil or vinegar
- Plastic bags for storing frozen foods
- Laurel leaves
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 31,665 times.
If you open the lid of the flour jar and see small worms crawling inside, it’s probably a grain weevil. Cereal weevils are actually small, reddish-brown, flying bugs. Since cereal weevils can lay several eggs a day for many months, you may have to deal with them for a while. Clean out the kitchen and store the flour in a hard, airtight container. It may take some time to get rid of all the cereal weevils eggs, but improving storage conditions in the kitchen will help prevent weevil growth.
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