What is a key identifying feature of the adult white grub?

The key identifying feature of the adult white grub is the raster pattern, which refers to the arrangement of the setae (bristles) on the last abdominal segment of the insect. This pattern is essential for distinguishing white grubs from other similar species, especially since many beetle larvae can appear similar in color and size. The unique raster patterns serve as important taxonomic features that entomologists and pest control professionals rely on to accurately identify the species of white grub.

While color, size, and behavior can offer some hints about the identity of an insect, they are less reliable for definitive identification due to variations within species and environmental influences. For instance, similar species might exhibit similar colors or sizes, and behavior can vary depending on factors like age or health, but the specific arrangement of the raster remains a consistent and reliable characteristic for accurate identification.