An update regarding my previous answer:
Snowy Escape's adventure gear and Selvadorada's repellents/relief do not work vice-versa, the beekeeper's suit from Seasons also does not work, and Outdoor Retreat's Herbalist potions do not work for Mt. Komorebi's "wildlife".
That said (as pointed out by @Childrenofhurin ) Outdoor Retreat's Herbalist potions - specifically the 'Insect Repellent Liniment' and 'Soothing Skin Balm' - work to repel and soothe the effects of Belomisia's Bees and Spiders (unless one receives the "Feeling Icky" moodlet which progresses to poison). Indirectly, the 'De-stressing Decoction' works to relieve the Tense moodlet from Fire Flies, whilst the 'Deodorizing Cream' (same as the 'Waterfall In a Bottle') replenishes the hygiene loss from their attack.
Mt. Komorebi's denizens are tied directly to their respective adventure gear, and whilst I'm sure there are other ways to relieve their effects (as well as Lightning Bugs and Plasma Bats from Belomisia), anything further would be outside of the scope of this endeavour.
