
having one brood a year
Found on
http://phrontistery.info/u.html

having a single generation in a year
Found on
http://www.encyclo.co.uk/local/21517

one generation per year.
Found on
http://www.encyclo.co.uk/local/22036

Refers to an organism that has only one generation per year.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

univoltine 1. Of certain silkworms: producing one brood per annum. 2. There are multivoltines. Some species produce one, two, three, four, six, or even eight broods per annum, and in the commercial world are distinguished as, univoltines, bivoltins, trivoltins, quadrivoltins, etc.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2231/7

a species having one brood per year.
Found on
https://www.amentsoc.org/insects/glossary/begins/with/u/

Having one brood per season.
Found on
https://www.encyclo.co.uk/local/20499

Having only one brood or generation per season.
Found on
https://www.encyclo.co.uk/local/22342

having but a single generation a year
Found on
https://www.encyclo.co.uk/local/22346
No exact match found.