Drugstore Beetle (Stegobium paniceum)

The drugstore beetle, also known as the bread beetle or biscuit beetle, is a tiny but troublesome pest that can infest a variety of stored products in Sri Lanka.

Identification

  • Physical description: Small, reddish-brown beetle (around 2-3.5 mm long) with a rounded oval body. They have visible antennae with club-like tips.
  • Habitat: Found in stored products like grains, flour, cereals, spices, nuts, dried fruits, pet food, and even some medications (hence the name). They prefer warm, dry environments.
  • Feeding habits: Feed on a wide variety of dry, organic materials. They can chew through packaging to reach food sources.

Behaviour

  • Life cycle: Complete metamorphosis with four stages: egg, larva, pupa, and adult. The entire life cycle can take as little time as two months under ideal conditions.
  • Activity patterns: Primarily active at night, but can be active during the day if disturbed.

Signs of Infestation

  • Visual signs: The presence of adult beetles in stored food products is the most obvious sign. Look for tiny holes in packaging, frass (insect droppings) resembling fine powder, and shed skins.
  • Behavioral signs: Foodstuffs may appear webbed together by larvae, and you might notice a musty odor emanating from infested products.

Control Methods

  • Prevention: Practice good sanitation in storage areas. Store food products in airtight containers made of glass, metal, or thick plastic. Regularly inspect stored items for signs of infestation.
  • Non-chemical control: For small infestations, freezing infested products for a few days can kill all life stages of the beetle. Diatomaceous earth dust can be sprinkled around storage areas to deter and kill beetles.
  • Fumigation: In severe cases, fumigation by a licensed professional may be necessary. Fumigation ensures complete eradication from infested products and surrounding areas.

Additional Information

  • Drugstore beetles are known for their ability to chew through various packaging materials, including cardboard, plastic, and even some foil wrappers.
  • They are relatively tolerant of cold temperatures compared to other stored product pests.
  • Maintaining a clean and dry storage environment is crucial for preventing drugstore beetle infestations.