Ornamental and Turf Pesticide Applicators Practice Exam

How can tiny mites on junipers and evergreens be detected?

1. Tapping the leaves against a white index card

2. Using a magnifying glass to inspect each leaf

3. Spraying water on the leaves

4. Observing the plants under direct sunlight

The correct answer is: Tapping the leaves against a white index card

Tapping the leaves against a white index card is an effective method for detecting tiny mites on junipers and evergreens because it allows for the collection of the mites in a manner that clearly reveals their presence. When leaves are tapped, any mites present will fall onto the card, contrasting against the white background, which makes them easier to see. This method is particularly useful for identifying spider mites, which are common pests that can cause damage to these plants. While using a magnifying glass to inspect each leaf provides a detailed visual assessment, it requires a more careful and time-consuming approach, which may not be as efficient for quickly diagnosing a possible infestation. Spraying water on the leaves does not provide any means for detection and can even drive the mites deeper into the foliage, making them harder to see. Observing the plants under direct sunlight can help in visualization but does not necessarily aid in detecting the mites effectively, as they can be very small and may blend into the foliage. In summary, tapping leaves against a white index card is a practical and efficient detection method that allows for the identification of mites through clear contrast and visibility.