Which pest is known as the cottony cushion scale?

The cottony cushion scale is identified as Icerya purchasi, making it the correct answer. This pest is a significant issue in agriculture, particularly affecting crops such as citrus and other ornamental plants. It is characterized by its white, fluffy appearance that resembles cotton, which is where it gets its common name.

The cottony cushion scale has a complex life cycle that includes both males and females, with the females producing a fluffy, protective covering for their eggs. This can make them challenging to control, as the scale can be hidden under this protective coating.

In contrast, the other mentioned pests are different species that have their own unique traits and do not share the cottony appearance or characteristics associated with Icerya purchasi. Understanding the specific characteristics and behaviors of various pests is essential for effective management and control in agricultural practices.