CDFA Pest Prevention Plant Regulation Practice Exam

Which pest is known for feeding on a substantial number of different host plants?

1. white-fringed beetle

2. Japanese Beetle

3. sweet potato weevil

4. aphids

The correct answer is: Japanese Beetle

The Japanese Beetle is recognized for its ability to feed on a wide array of host plants, making it a particularly notable pest in agriculture and horticulture. This beetle has a diverse diet, consuming the leaves, flowers, and fruits of many different plants. Its preference for over 300 types of plants, including ornamental trees, shrubs, and crops, allows it to thrive in various environments, contributing to its status as a significant pest. In contrast, while the other pests listed also affect multiple plants, they do not match the Japanese Beetle's broad range of host plants. For example, the white-fringed beetle primarily targets a more limited group of plants, predominantly in the root systems. The sweet potato weevil is specifically associated with sweet potatoes and some related plants, which constrains its host range significantly. Aphids, while they can infest a variety of plants, usually specialize in particular species or families of plants. Therefore, given this context, the Japanese Beetle stands out for its extensive feeding habits across a diverse spectrum of host plants.