Does Malathion cause mold like snail bait does?

[kmccormic]

This poor Phal deliciosa had 2 problems which I didn't notice for 3 months (2 months in quarantine) - snails and critters I think were Thrips. It came in with some pretty black roots at the top, but the rest of the roots were mostly green, which then turned black in some places as seen through the clear pot. I saw the critters, sprayed with Imidocloprid and then two weeks later trimmed the poor-looking roots, spraying roots and leaves with water thoroughly, and repotted into new moss. I drenched the new mix and plant with Malathion for good measure, in case I hadn't gotten all the eggs. I found 2 snails in the old mix (yuck!) so hopefully that's also the last of the snails. But now, 1 week later, I'm noticing fuzz and mold but only on the top of the pot, or on a few roots (small white dots in picture.) Does Malathion commonly cause this, and should I ignore it, just let it run it's course? Or should I trim more roots and repot the poor thing again?

Thanks again for your patience and advice.