Which is the correct order of the four common roaches from largest to smallest?

The correct order of the four common roaches from largest to smallest is American, oriental, German, and brown banded. The American cockroach is the largest among these, typically measuring 1.5 to 2 inches long. This makes it easily distinguishable compared to the others. The oriental cockroach follows in size, generally around 1 inch long, which is still relatively large but smaller than the American.

The German cockroach is smaller, typically about 0.5 to 0.7 inches, and is often recognized by its distinctive two dark stripes running down its back. Finally, the brown banded cockroach is the smallest of the group, usually around 0.5 inches long, and is characterized by its lighter color and the presence of bands across its wings.

Understanding this size hierarchy is key in pest control as it helps in identifying and managing these pests in various environments. Correct identification is crucial for effective treatment and control of these species, as their behaviors and habitats may differ significantly.