Not a lexical word.
昆虫及 is the tail of a longer noun phrase that THUOCL's word-segmenter mis-grouped —
及 ("and") is a literary conjunction that never stands alone at the end of a phrase. In real text it is always
昆虫及 + something (e.g.
昆虫及其天敌,
昆虫及节肢动物).