He has to fight with a lot of insects around his house in every summer, which have caused repeated trouble and anxiety to him.
Could I call them haunting insects indicating the effect they are bringing? If not, what's the appropriate phrase?
He has to fight with a lot of insects around his house in every summer, which have caused repeated trouble and anxiety to him.
Could I call them haunting insects indicating the effect they are bringing? If not, what's the appropriate phrase?
Another word that fits in context is pesky.
Pesky, however, do only conveys the meaning of being annoying or making you feel upset. I don't know any word that has the additional connotation of becoming anxious because of something what is bothering you. For that reason, I'd phrase it like that.
He's worrying about pesky insects.
Aside: On COCA pesky is the second collocation (11 usages) with insects which partially conveys the idea you're looking for. The first is annoying (16 usages). On BNC the first word which matches is offending (only 2 usages).
Words like stitching, biting, harmful, poisonous etc. may incidentally convey that insects will likely be annoying or worrying but their meaning doesn't include that sense at hand.
I would rather call them "bothersome/bothering insects" or "annoying insects".
Flies, mosquitos, & similar insects that keep buzzing around your house and refusing to go away or be caught are pesky insects.
A large number of fleas, bedbugs, ants, or other insects that are ruining things in your home is an infestation.
A colony of termites that is causing structural damage to your home is a disaster.