Why do companies spray their crops with so many pesticides?

Image by chesbayprogram
A field planted with cover crops shortly after sunrise at Merkle Wildlife Sanctuary

Question by dumdum: Why do companies spray their crops with so many pesticides?
Why don’t we have to cover our fruits and vegetables growing in our backyards with poisons, yet these companies need to cover their crops with poisons? Are pests more attracted to their crops?

Give your answer to this question below!