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I know that male mealy bugs fly (to the females) and they resemble "fluffy" gnats.

The most common issue people have with grubs is with the lawn. If you are just planting flowers, you should be ok planting seeds before you treat. If you are planning on planting grass seed, I would hold off until after you treat.

After you treat for grubs, you can plant any seeds. The method you use to treat for grabs, chemical or otherwise, should not interfere with plant growth.

The same techniques can be applied to outdoor plants affected by these pests as well. Remove scale insects from plants using a soft cloth or sponge dipped in insecticidal soap. Insecticidal soaps or neem oil are good choices, but keep in mind that these are not cures. You will need to follow up with a spray mixture of insecticidal soap and horticultural oil to control scale insects. The oil smothers the slow-moving insects. You might also want to consider introducing predatory insects (such as the parasitic wasp), which feed on these pests.

Pill bugs, also known as sowbugs or “rollie pollie,” feed mostly on decaying vegetation and do not pose a great threat within the garden unless over population occurs. If this happens, marigolds can often take care of the problem. Pill bugs are found under logs, stones, and in damp basements. Keeping your homes and the areas around them clean and dry will also help.

This article has some things you can try:
https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-of-ants.htm

Slugs are the usual suspects when there are holes but no pests to be found. They only come out at night, so they are hard to spot. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/facts-about-slugs-and-how-to-kill-garden-slugs.htm