Stored product pests refer to the insects and mites that infest stored food and agricultural products, causing an estimated 10–20% loss of stored grain globally each year.

The most common stored product pests in Chinese households include: the rice weevil (Sitophilus oryzae) — adults are 2–3 mm long, dark brown, with round punctures on the pronotum; the female drills a hole in a grain of rice to lay an egg.

The larva develops inside the rice grain and is very difficult to detect from the outside.

Rice grains infested by the rice weevil have a small hole on the surface.

The Indian meal moth (Plodia interpunctella) — adults are small moths with a wingspan of about 15 mm; the base of the forewings is grayish-white, and the tip is reddish-brown.

The larvae spin silk webbing on the food surface, forming patches of silk and food debris mixture, most commonly found in flour, grains, nuts, and dried fruit.

The lesser grain borer (Rhyzopertha dominica) — adults are about 3 mm long, dark reddish-brown, and one of the most destructive stored product pests.

The cigarette beetle (Lasioderma serricorne) — about 2–3 mm long, light brown, and infests tobacco, spices, dried fruit, and medicinal herbs.

The focus of stored product pest control is prevention — airtight storage, regular inspection, and checking newly purchased grains before storage.