Sevin, also known by its generic name carbaryl, should be used only by commercial producers. Read the safety data sheet here: https://www.backedbybayer.com/~/media/BackedByBayer/msds/en/Sevin_SL_Insecticide.ashx
The California Integrated Pest Management Program provides additional information about carbaryl here: http://ipm.ucanr.edu/TOOLS/PNAI/pnaishow.php?id=20
Warning labels on the home-use version of carbaryl indicates that you can ingest leafy vegetables that have been treated with carbaryl after waiting 14 or more days. You should wash all plants thoroughly before eating them.
The U.S. Department of Health and Human Services provides a list of products like carbaryl and its use, safety, and warnings: https://hpd.nlm.nih.gov/cgi-bin/household/prodtree?prodcat=Pesticides&purpose=home+garden&ty...