Which pest is commonly found in citrus and exhibits a cottony texture?

The pest commonly found in citrus that exhibits a cottony texture is known as the cottony cushion scale, which is scientifically referred to as Icerya purchasi. This pest is notorious for its distinctive white, fluffy appearance, which resembles cotton. This cottony substance is actually a waxy covering that the scale insects produce for protection.

Icerya purchasi can cause significant damage to citrus plants as it feeds on the sap, leading to weakened plants and potential dieback. It can also secrete honeydew, which fosters the growth of sooty mold, further impacting the health of the citrus trees.

In the context of the other options, while Pseudococcus longispinus, Pseudococcus calceolariae, and Planococcus citri are also pests that can affect plants, they do not exhibit the same prominent cottony texture that is characteristic of Icerya purchasi. Pseudococcus species are commonly known as mealybugs, which also can appear cottony but are different in terms of their specific characteristics and generally do not have the same level of impact on citrus as cottony cushion scale does.