Which of the following are common pests that affect floral crops?

Aphids, spider mites, and whiteflies are indeed common pests that significantly impact floral crops. Aphids are small, sap-sucking insects that can quickly infest plants, leading to weakened growth and the potential spread of plant viruses. They are often found in colonies and can reproduce rapidly, making infestations difficult to control.

Spider mites, while technically arachnids rather than insects, can also cause extensive damage. They thrive in warm, dry conditions and feed on plant sap, resulting in stippling on leaves and overall plant stress. Their presence often goes unnoticed until significant damage occurs.

Whiteflies are another problematic pest known for their ability to proliferate rapidly. They also feed on plant sap and secrete a sticky substance known as honeydew, which can lead to secondary fungal issues like sooty mold. Their capacity to transmit plant diseases further complicates their management in floral crops.

In contrast, the other options list pests that are either less common or do not specifically pose the same level of threat to floral crops as those mentioned in the correct answer. Understanding these specific pests helps in developing effective management strategies to protect floral crops from damage and ensure healthy growth.