Illinois Field Crop Applicators Practice Test

What characteristic identifies Japanese beetle grubs?

1. White and C-shaped, approximately 1 inch long

2. Brown and slender, approximately 2 inches long

3. Green and oval-shaped, about ½ inch wide

4. Yellow and flat, about ¾ inch in length

The correct answer is: White and C-shaped, approximately 1 inch long

The characteristic that identifies Japanese beetle grubs is that they are white and C-shaped, typically measuring around 1 inch long. This description aligns with the common physical traits of the larvae of the Japanese beetle, which are known for their distinct curled appearance as they live and feed in the soil. Their white coloration allows them to blend into the ground, which can provide some camouflage against predators and environmental factors. This identification is crucial for those involved in agricultural practices, as it helps in monitoring and managing pest populations effectively. Understanding the specific traits of these grubs aids in implementing appropriate control measures and timing for treatments. The other answer choices describe characteristics of different beetle larvae or grubs, which do not match the typical appearance of Japanese beetle grubs.