Dealing with Plant Pests Organically
The three most useful ways that I have found to deal with plant pests organically are:
1.good ol' soap spray
2. fish emulsion
3. neem oil
These may not work on every bug you may encounter, but they work on most of them. Neem oil is a fascinating substance that works in a number of different ways on pests, mostly by interrupting their reproductive cycle.
Soap Spray
1 bulb garlic
1 onion
1 Tablespoon cayenne powder
1 Tablespoon liquid dish soap
1 quart water
Soap spray works pretty well on soft-bodied insects like aphids.