An unclear term, best avoided. If you wish to indicate that an insect is a pest, it is better to write "pest insect" to make the meaning clear. The term "insect pest" is especially [..]

and plant pest

Producing disease in insects (adjective).

A host other than the target host for parasitoids, one that biocontrol practitioners may more readily rear than the target host in a laboratory, thus implying that the biocontrol agent is not absolute [..]

Said of a pest that damages the unmarketed part of a plant (e.g., the leaves, when it is the fruit that is marketed); contrast with direct pest.

A collective term for parasites, parasitoids, pathogens, predators, and competitors that inflict mortality on a population of a species.

A parasite, parasitoid, or pathogen that, at least in the area specified, is monophagous.6

, and prey-specific

was coined by Lockwood (1993, 1996) to explain a subset of the controversial kind of biological control advocated as "new associations" by Hokkanen and Pimentel (1984). There is controversy [..]

[but see preferred term because these organisms are parasitoids rather than parasites] (noun); a special case of hyperparasitism [but see preferred term hyperparasitoidism] occurring in the chalcidoid [..]