Category A and E Pesticide Practice Test

The presence of spots or patches of white to grayish, talcum-powder-like growth is a classic sign of powdery mildew. This fungal disease typically manifests as a powdery white substance on the surface of leaves, stems, and flowers, making it easily recognizable. The growth is caused by various species of fungi that thrive in warm, dry conditions, often when there is high humidity. As the disease progresses, it can lead to wilting, yellowing, and eventual death of affected plant tissues.

Other options present symptoms related to different conditions or diseases. For example, green leafy growth may indicate healthy plant development or proper nutrient uptake. A sticky residue on leaves might suggest the presence of sap-sucking insects or honeydew, which is not related to powdery mildew. Dark patches on flower petals could indicate issues like fungal infections or cultural problems but would not pertain to the powdery mildew diagnosis. Understanding the specific symptoms associated with powdery mildew is crucial for accurate identification and effective management of this plant disease.