What type of pesticles do chemists design to protect crops?

Chemists design various types of pesticides to protect crops, including insecticides to target harmful insects, herbicides to control unwanted weeds, and fungicides to combat fungal diseases. These substances can be synthetic or derived from natural sources, and they work by disrupting biological processes in pests or inhibiting their growth. Additionally, some chemists focus on developing pesticides that are more environmentally friendly and have reduced toxicity to non-target organisms. Integrated pest management strategies often incorporate these pesticides alongside other methods for sustainable crop protection.