What shape is the grub of the Japanese Beetle?

The grub of the Japanese Beetle is "C" shaped or curled, which is a characteristic feature that helps in identifying these larvae. This distinct shape results from the way the grub resides within the soil, which allows it to easily curl up into a compact form. The "C" shape is typical of many beetle larvae and is often associated with their developmental stage.

In contrast to the "C" shape, the other options do not accurately describe the physical form of Japanese Beetle grubs. For instance, a spiral shape would imply a more complex twisting form than what is observed, while a flat shape wouldn't provide the protective curvature that a "C" shape allows. A spherical shape also does not accurately reflect the appearance of the grub, as these larvae are elongated and exhibit the characteristic curl when disturbed or at rest in the soil. Recognizing the "C" shape of Japanese Beetle grubs is essential for effective pest management and control strategies.