Pest Control

A good organic way to get rid of a range of pests including Aphids, caterpillars, thrips, white flies, mites is a soap/water solution.
Use a soap that doesn't contain detergent or caustic soda. Mix the soap and water until the water turns milky like froth. Spray the plants and let the solution sit for a day before rinsing.
That will kill most pests without harming the plants or environment.
The soap paralyzes the pests which will cause it to starve to death.

 For mites and mildew mix half milk/water solution and spray that onto your veges every few days is a good trick also.