Diatomaceous earth is wonderful stuff.
It's food grade safe so it is safe around pets and children (in fact u can dust your dog or cat with it to kill fleas)
It'll kill a wide variety of pests (not spiders, but they beneficial for killing bugs themselves) and unlike pesticides it will actually nourish your soil, instead of poisoning it.
It's cheaper than pesticide too.
It's made of fossil shells from tiny diatoms from millions of years ago. The powder sticks to the exoskeleton of the insect and eats away at it. (doesn't work for caterpillars)
I was amazed to find out how wonderful this stuff is and shocked to think how popular pesticides are compared to this safer, all natural alternative.
Give it a try, you can find it at lowes or home depot but you have to look really hard, it's hidden among the hundred of bottles of overpriced, chemical pesticides.
"The way to see by faith is to shut the eye of reason."