Which species is referred to as the Western yellowstriped armyworm?

The Western yellowstriped armyworm is correctly identified as Spodoptera praefica. This species is recognized for its distinctive yellow stripes along the sides of its body, which gives it the name "yellowstriped armyworm." It is a significant agricultural pest, particularly in western regions, where it can cause damage to various crops.

In contrast, the other species listed are known pests as well, but they are not referred to as the Western yellowstriped armyworm. Spodoptera exigua, for example, is known as the beet armyworm, while Mythimna unipuncta is commonly called the armyworm. Phyllocnistis citrella is recognized as the citrus leaf miner, with a different life cycle and impact on crops. Thus, while all options relate to pests in agriculture, only Spodoptera praefica is specifically associated with the designation of the Western yellowstriped armyworm.