When should I reseed the bare spots
Yes, it is recommended to scrape off the dead grass and reseed. The timing depends on which grass you choose.
Getting rid of them is best done, naturally. Neem Oil, milky spore, and beneficial nematodes are helpful. There are chemical options too.
This article will help:
I have small white flies in all of my vegetable plants especially squash but it spread to tomatoes, sweet potato leaves, and peppers. I have tried foil reflection around the base, dish soap, diatomaceous earth, neem oil and a combination. Nothing kills them permanently. Should I just destroy the plants? They are not growing anything as the flies suck out the juice from the leaves and the plants struggle. I was working organically but am willing to go to something’s else temporarily if needed.
This can be tricky. I like using natural methods like the concentrated active ingredient of Neem oil. Azadiractin is a lot more concentrated than the raw oil. Pure capsaicin from peppers serves the same purpose when concentrated.
Microbial control is an option as well. Beauveria bassiana is a naturally occurring fungus that is known to destroy whitefly populations. This is my favorite method.
Natural predators can be helpful. The green lacewing will hunt them, actively.
I have bananas, Mandeville etc to bring indoors for winter but I don't want ants etc all over the house!!!
My preferred methods are using Neem oil, or azadiractin. This is the active ingredient in Neem oil.
Sticky, webby, collections on my indoor Jade plants and citrus plants.
Sounds like spider mites. They leave the webs. You also could have mealybugs, which leave honeydew, a sticky, sweet substance.
I have about 30 potted plants. Some were outdoors for the summer and are now indoors. There are an increasing number of gnats around the soil and flying around the apartment. I have two trays with vinegar and sugar which helps to attract and catch a few, but not enough. Once in a while I will spray bug killer over the plants, but is probably the wrong kind. How do I better control the spread of gnats? Or do I need to replace all the soil?
Replacing the soil is one option. Another is cutting back on the watering. Damp soil will attract fungus gnats. They won't survive in dry soil. Here is more:
are there any pesticide type things to drench them with?
You probably mean the fungus gnats. Keeping plants on the drier side helps. Here is more:
I have flying knats around my house plants
Fungus gnats are attracted to moist soil, so it helps to let the plant soils stay on the drier side. This link should help:
Castile soap. Water with it. Kills larvae.