how will the knowledge of chemical that repel dodder plant be helpful?

Answer 1

Because it will save crops of tomatoes, carrots, onions, citrus trees, cranberries, wheat, alfalfa, flowers and other crops from this parasitic weed that seems to be able to "sniff" out its prey.

As their preference seems to be toward tomato plants, it would seem logical that finding an herbicide that includes this "scent" then destroys the weed will be important to controlling its infestation into crops.