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post-emergence
post-emergence adj. and n. 
/ˌpoʊstiˈmərdʒəns/ (a) adj. occurring, performed, or applied after the emergence of seedlings from the soil; (b) n. a soil treatment for killing weeds performed after the emergence of the wanted seedlings from the soil.
Brit. /ˌpəʊstᵻˈməːdʒ(ə)ns/
, /ˌpəʊstᵻˈməːdʒ(ə)ns/U.S. /ˌpoʊstəˈmərdʒəns/
, /ˌpoʊstəˈmərdʒəns//ˌpoʊstiˈmərdʒəns/ΘΚΠ
the world > food and drink > farming > cultivation or tillage > cultivation of plants or crops > [adjective] > after emergence of seedlings
post-emergence1938
1938 Amer. Jrnl. Bot. 25 182/2 Formaldehyde and Chloropicrin were very effective when used in treating soil to control post-emergence damping-off of tomato seedlings.
1955 Sci. News Let. 2 July 10/3 Post-emergence is designed to kill undesirable plants that exist in areas where plants are already growing.
1962 Times 12 Nov. 17/4 Another avenue of research which is leading to useful results is that involving pre-emergence spraying of cereal crops instead of the traditional post-emergence method.
1990 Top Producer Feb. 15/2 Although there were herbicides for postemergence broadleaf control, grass remained a problem.
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