Adjective
preemergence (not comparable)
(of herbicide use) Before the emergence of the plants being targeted.
EARLY RISERS: If rain doesn’t occur within a week after a preemergence herbicide is applied, early-emerging weeds may escape control due to lack of herbicide activation. Source: Internet
D., AgriLife Extension turfgrass specialist, Dallas, said applying the correct preemergence herbicides now to lawns will disrupt the germination and emergence of unfavorable plants in the spring. Source: Internet
"If we apply our post application within a 21- to 28-day window of preemergence application, we're controlling a lot more weeds before they even emerge." Source: Internet
Using preemergence herbicides can help prevent the spread of resistant weeds. Source: Internet