Yes, I get the brown stuff in chips. When I peel them, I cut it all out, another ick.
No imidicloprid is in a class of chemicals called neonicotinoids and totally different from malathion which is what I think you meant. I might try Sevin again since I still have it but not suit up as carefully; guy at the nursery says he's been spraying it for over 30 years.
The LAT article is still up, well worth the read for both gardeners and farmers.
Marathon is a trade name for an imidicloprid.
I don’t think you can get Monitor. You don’t want it. It is highly toxic.
Back when I had a place to garden I lived in the same town as my dad. I would have him come over and do any bug killing. Then I didn’t have to worry about my kids getting into those poisons.