There are plenty of ways to handle pests in your organic garden. Here are a few of them:
You can try using natural sprays like insecticidal soap and neem oil. Insecticidal soap works well for aphids and whiteflies while neem oil is great for a variety of pests and some fungal issues.
Make sure to clear away fallen weeds leaves and crop residues from around your plants. This helps get rid of hiding spots for pests in the winter and lowers the risk of disease spreading to your healthy plants.
For minor infestations manually remove pests and place them in a bucket of soapy water for disposal.