Ant fleas - Ants only

...It is also used as an ingredient in canned goods, juices, jams, etc. [Isao Shimura]
[Japanese Folklore]
Because the pronunciation of the word pear is similar to the Japanese word for "nashi," people are afraid of planting them on their houses, as it is believed that this will lead to the loss of wealth and good fortune, or that people will die, and it is sometimes referred to as ari no mi, or "ari no mi," as a lucky charm. On the other hand, it is said that if pears are used as building materials for a house, there will be "nothing" and theft will not occur, and in some places people are happy to plant them in the direction of the demon's gate, as this will ensure that there is no demon in the direction.

*Some of the terminology that mentions "ant fleas" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また缶詰，ジュース，ジャムなどの原料にも用いる。【志村 勲】
［日本の民俗］
　ナシは語音が〈無し〉に通ずるため，財産や幸運がなくなるとか人が死ぬといって屋敷に植えるのを忌み，縁起ことばでアリノミと言い換えることもある。反対に，家の建材にナシを使えば〈何もなし〉で盗難にあわぬといい，鬼門に植えて〈鬼門なし〉だと喜ぶ所もある。…

※「アリノミ」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報