Here are some alternatives to chemical pesticides:

1. Biological controls: Using natural predators or parasites to control pest populations, such as ladybugs to control aphids or Bt (Bacillus thuringiensis) to control certain caterpillars.

2. Organic pesticides: Natural substances like neem oil, diatomaceous earth, or pyrethrin that can be used to manage pests.

3. Crop rotation and companion planting: Changing the crops grown in a field each season and intentionally planting certain crops together can disrupt pest life cycles.

4. Mechanical controls: Using physical barriers like row covers or traps to prevent pests from accessing crops.

5. Habitat management: Encouraging beneficial insects, birds, and other natural predators by providing food, shelter, and breeding sites on the farm.

6. Integrated pest management (IPM): A holistic approach that combines multiple non-chemical control methods tailored to the specific pest problems in a given location.

The most effective strategies often involve using a combination of these alternative approaches rather than relying solely on synthetic pesticides. This can help reduce environmental impacts while still effectively managing pests.