害虫

1. Origins, structure, and basic meaning

• Structure: 害虫, read がいちゅう, denotes insects that damage crops or harm people's living conditions.
• Basic usage: In 農家は作物を害虫から守る方法を工夫している。, farmers devise ways to protect crops from damaging insects.

2. Common pitfalls and similar expressions

• A label based on harm
  • 虫 refers broadly to insects or bugs, whereas 害虫 classifies them by the harm they cause. The sentence about checking a guide asks whether the insect belongs to that category.