益えき虫ちゅう

noun

beneficial insect; useful insect

Refers to insects that are helpful to humans, such as pollinators or natural pest controllers. Often contrasted with 害虫 (pest).

• テントウムシはアブラムシを食たべる益えき虫ちゅうです。

  Ladybugs are beneficial insects that eat aphids.

• 農のう家かは益えき虫ちゅうを増ふやすために農のう薬やくの使し用ようを控ひかえた。

  The farmer reduced pesticide use to encourage beneficial insects.