Certified Professional Horticulturist (CPH) Practice Exam

What are the most common indoor plant problems?

1. Aphids, Whiteflies, Mites

2. Ants, Fungus gnats, sooty mold

3. Mealy bugs, Powdery mildew, and rust

4. Leaf gall, root rot, Whitefly

The correct answer is: Aphids, Whiteflies, Mites

The selection of the most common indoor plant problems as aphids, whiteflies, and mites is insightful when considering the typical pests that affect indoor plants. Aphids are small, sap-sucking insects that thrive in warm, sheltered environments, making them a prevalent problem indoors where climate conditions are often controlled. Similarly, whiteflies are also sap-sucking pests that can quickly infest indoor plants, leading to wilting and yellowing of leaves. Mites, particularly spider mites, are notorious for hiding on the undersides of leaves and can cause significant damage by feeding on plant tissue, leading to stippling and eventual leaf drop. While other options mention relevant issues, they encompass a broader range of plant health problems that may not be as common as the pests listed in the correct choice. For example, mealy bugs and powdery mildew also present problems but are not as frequently encountered as the three mentioned in the chosen answer. Understanding these specific pests helps in recognizing and addressing common issues affecting the health of indoor plants effectively.