Red-legged ham beetle

The red-legged ham beetle (Necrobia ruficollis) is a member of the order Coleoptera and the family Cleridae, commonly known as checkered beetles. Adult beetles are small, typically ranging from 3.5 to 5 millimeters in length. They are easily identified by their shiny, metallic blue-green elytra (wing covers) and a distinct reddish-brown pronotum and legs, which gives the species its common name.

This species is a well-known pest of stored products, primarily those of animal origin. It frequently infests cured meats, salted fish, cheese, hides, and dried animal products. While it is primarily associated with protein-rich materials, it can also be found in grain warehouses if there are secondary food sources like animal remains or populations of other stored-product insects that the larvae can prey upon.

The biological life cycle of Necrobia ruficollis progresses through complete metamorphosis: egg, larva, pupa, and adult. Females deposit eggs directly onto suitable food sources. Upon hatching, the larvae begin to feed immediately. The development time is highly dependent on ambient temperature and humidity; higher temperatures significantly accelerate the rate of reproduction and larval growth, potentially leading to multiple generations per year in temperate climates.

The damage caused by this beetle is significant in industrial food storage settings. Both the larvae and adults bore into the products, creating internal tunnels. This feeding activity leads to rapid weight loss of the stored goods and contamination by larval excrement, cast skins, and fragments. Infected products quickly lose their commercial value and become hazardous due to the secondary spread of bacteria and fungi during the feeding process.

Effective management and control strategies for the red-legged ham beetle include:

• Rigorous sanitation practices to eliminate spilled food scraps and debris in storage areas.
• Use of cold storage, which significantly slows down or prevents beetle reproduction.
• Regular inspection of stored animal-based products for signs of infestation.
• Professional fumigation of warehouses prior to the introduction of new products.
• Ensuring physical barriers, such as tightly sealed containers, are used to prevent insect entry.