Question
We get a lot of pill bugs entering our house (front and back doors and many in flower beds).  How do you get rid of these?  Also tiny spiders always coming in.  Thanks again, Ruth
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Followup To  

Answer
Hi Ruth;
I don't have spiders inside anymore.
the herbs I use inside the house are rosemary and lavender ( I use both french and english lavenders. don't know which one works best on insects). I put a small piece of rosemary on each pantry and cupboard shelf, and a little longer piece under each appliance, and anywhere roaches can come in or hide.
I todd a sprig of lavender in each closet, under each bed, and anywhere it can be put that it is not noticed.
I get cedar oil at the health food store, and paint a trail of it along each clothes rod in the closets, around the baseboard and down the edge (next to the wall) of the door frames.
I do this about once a month, although after you have done it and all the bugs are chased out of your house, you can cut back to every 2 months if you want.
since I have been doing that, I have no roaches, spiders, fleas, ticks, silverfish or earwigs in the house ( I have 4 dogs, so I treat the whole yard with cedar bark mulch, and I do use Frontline on my dogs. I don't ant fleas near them, and i sure don't want them near me.
I live in north Texas, and fleas are a big problem here.
Pill bugs, AKA, rolypolys,Doodlebugs, woodlice, woodlouse.
This is what I found on where they live etc. It doesn't give much of a repellant.

Sow or Pill bugs:
AKA: Doodlebugs, woodlice, woodlouse, rolypolys. Small terrestrial isopods having a convex segmented body that rolls up into a ball. Pill bugs are actually relatives of shrimp.

Pill bugs and sow bugs are different. Both pill bugs and sow bugs will inhabit the same area. They are difficult to tell apart. How can you tell? The pill bug can roll into a tight round ball and the sow bug can sort of "hump" up. It cannot form a "pill" like the pill bug can. Both bear young twice a year or more. They carry them until the young are able to keep up with the rest of the colony. The young may leave mother at times however it is not unusual for them to come back, allowing her to to take care of them for as long as she can. As food supplies dwindle, colonies will relocate and forage to nearby areas that fill their dietary needs. Most feeding is done during the night.

Sow bugs also have gills and need constant moisture to live. They tend to live in moister northwest climates. They are primarily nocturnal, and eat decaying leaf litter and vegetable matter. They sometimes feed on the tips of young plants, but they also help the environment by breaking up decaying plant matter and help speed up the recycling of the nutrients they contain.

Use corncobs as a bait to trap these intruders.
Remove their hiding places such as piles of plant material, boards/wood, bricks, large rocks, etc.
Reduce moisture or humidity level indoors. Use bathroom fans, stove hood vent fans, vent clothes dryers outside.
Crawl spaces and attics need to be well ventilated. Remove excess vegetation and debris around exterior perimeter of the home. Make sure that leaf debris (leaves hold moisture and hide the bugs) is cleaned up from around the outside of your house.
Keep rain gutters and downspouts clean and in good repair. Instead of chemicals, use a caulking gun to close any cracks or crevices at or near ground level.
Houses built on a concrete slab poured directly on the ground, can have more of a problem with sow bugs or pill bugs if there is no moisture barrier under the concrete.  
Built-in planters are usually a bad idea for many reasons. Window box planters and planter boxes on decks tight against the house are good breeding places for many bugs.
There is a spider about one-half inch long with a brown rear body and a reddish front body. It has prominent fangs, long front legs, and is timid as it usually runs for cover when disturbed or seen. It doesn't have a common name but they are everywhere and harmless to people. The scientific name is Dysdera crocata. This little fellow feeds almost exclusively on pill bugs. They live under objects on the ground like stones etc. where pill bugs live. The long fangs" are used for feeding on the pill bugs not you!

I have not had much of a problem with them, so I have not looked for repellants.
Cedar repels so many insects, and I put a trail of it around the foundation of the house to repel termites, and scater it all over the yard for fleas and ticks, so that is maybe why I no longer see pill bugs.
Charlotte