Causes of Flour Infestation & How to Prevent It

18 September 2025

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Have you ever come across flour infested with weevils or even smelling musty?
It can be very frustrating, especially if you’ve been using it often and only just realized it now. In this situation, you might wonder, how could this happen? and are weevils in flour dangerous to health? Find out the answers in this article!

Causes of Flour Infestation

Wheat weevils are very small, sometimes even hard to see with the naked eye. Because of their tiny size, they can enter the flour and lay eggs without us realizing it. In fact, most of these weevils have already started breeding inside the wheat grains that are later milled into flour.

In other words, weevils may already be present in the flour before it is even packaged. That’s why it’s important to choose flour from trusted producers who prioritize the quality of raw materials, such as PT. Manunggal Perkasa. In our factory, every flour product is handled with care and according to standards to prevent contamination from the very beginning.

Another cause of flour infestation is improper storage, such as leaving it uncovered or using non-airtight containers. This allows weevils to enter and lay eggs.

Furthermore, flour stored in damp and warm places is also highly prone to infestation. This is because weevils thrive in such environments, allowing them to reproduce quickly.

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Are Infested Flours Harmful to Health?

You may be wondering, is it safe to consume flour that has been infected with weevils? Fortunately, wheat and flour weevils are not harmful to human health. They don’t bite, sting, or contain toxins, so you don’t need to worry if you accidentally consume them.

However, there are a few things to note. If the infestation has grown significantly, the flour may develop a musty odor and its quality will decline. This can affect the final outcome of your cooking or baking.

In addition, flour weevils can spread mold spores that may cause fungal growth. If you consume contaminated flour, there is a possibility of developing allergies or skin irritation. In rare cases, some individuals may experience throat swelling and difficulty breathing. In such situations, seek medical help immediately!

Therefore, flour that is already infested with weevils or other insects should not be used for cooking. This is to avoid cross-contamination and to maintain kitchen hygiene.

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How to Prevent Flour Infestation

To keep your flour free from weevil contamination, here are some simple steps you can follow:

  • Store flour in tightly sealed containers, such as airtight plastic or glass jars, to prevent weevils from entering.
  • Avoid storing flour in damp places or under direct sunlight.
  • Always use older flour stocks first.
  • Before using flour, check for signs of weevils such as tiny insects, larvae, or small clumps in the flour. These may indicate an infestation.
  • Regularly clean your flour storage area and kitchen with soap and warm water. Pay attention to hard-to-reach corners, as these can be breeding spots for weevils.

By applying the above methods, you can prevent flour infestation and maintain the quality of the ingredients you use for cooking or baking. Don’t forget to always use high-quality flour, such as the products from PT. Manunggal Perkasa, to ensure your cooking results meet your expectations!.(pj/mkt)