Anita from Watertown, New York writes
How long does it take to kill these insects? I sprayed 4 days ago and they are still alive.
Sevin Concentrate is labeled for both psylids and leafminers. The exact amount of time it takes to kill an insect will depend on a number of factors, such as where the insect is in its life cycle and how long it spent in contact with a treated surface. You should start to see results in a few days, but reapplication may be necessary per the product label, especially if the infestation is severe.
Answer last updated on: 05/15/2018