My basil plant was recently overrun with small black dots and died. I think it might have been caused by thrips. It was kept on a shelf with lavender, patchouli, chocolate mint, and catnip. The mint seems to be showing signs of these black dots as well, while the others appear to be fine. Is it okay to treat the plants with a systemic insecticide (such as Bonide's systemic houseplant insect control) if I am planning to eat or make tea with the mint?