CDFA Pest Prevention Plant Regulation Practice Exam

Where would you look for larvae of the Colorado potato beetle when inspecting tomato plants?

1. In soil about the roots

2. On leaves and stems of plants

3. In the stems

4. In the flower buds

The correct answer is: On leaves and stems of plants

The larvae of the Colorado potato beetle are primarily found on the foliage of host plants, which include tomatoes. These larvae feed on the leaves and stems, often causing significant damage to the plant. When inspecting tomato plants for these larvae, one should closely examine the upper and lower surfaces of the leaves, as this is where the eggs are laid and where newly hatched larvae are most active. The choice to look specifically on the leaves and stems is justified because these areas provide the necessary nourishment for the larvae, allowing them to grow and thrive. Additionally, the feeding habits of the larvae can lead to noticeable damage, making them easier to spot when they are present. In contrast, searching in the soil about the roots, in the stems, or in the flower buds would not yield results for locating these larvae, as their active feeding occurs above ground on the green parts of the plant. This understanding is fundamental when conducting an effective inspection for pest management in these crops.