Do lesser grain borers only eat grain?

Do lesser grain borers only eat grain?

Lesser grain borers are not picky, but they have a clear preference order:

First choice: whole kernels

They prefer intact, unbroken grain kernels, especially wheat, rice, corn, sorghum, etc. They bore directly into the kernel from the outside with their strong mandibles and hollow out the interior.

Second choice: dried goods and medicinal herbs

If grain is insufficient, they will also feed on various dried goods and Chinese medicinal herbs, including flour (but less preferred), dried noodles, beans, herbal slices, etc.

Last resort: wooden utensils

Their most unusual trait is that when starved, they will chew on wooden rice bins, shelves, and wooden boxes, boring holes in the wood to pupate. This is not for feeding (they cannot digest cellulose) but to find a safe place for metamorphosis.

Impact on households

Because they can eat both grain and wood, they are more damaging than other stored-product pests:

• Grain is hollowed out, producing large amounts of broken rice and powder.
• Wooden storage containers are damaged with boreholes, shortening their lifespan.
• Insect bodies and feces contaminate grain, leading to mold and spoilage.

Therefore, controlling lesser grain borers requires not only sealing grains but also paying attention to crevices in wooden storage cabinets. Apply food-grade diatomaceous earth to wood joints for protection to prevent them from hiding and pupating in the wood. If wooden rice bins are severely damaged, replace them with plastic or metal sealed containers—borers cannot chew through these materials.