Sentence:  Parthenogenetic reproduction, as a rule, takes place in the summer months, as seen in the Aphides, Crustacea ("Daphnia"), and Cecidomyiæ, where we see the asexual reproduction taking place during the summer, and at the approach of cold weather the process of <WSD>ovation</WSD> taking its place. 
Meaning of the word marked with <WSD> tags:  The act or state of laying eggs.