Question

How does a Contact Poison cause the death of a pest species?

• A. By absorption through roots
• B. By inhalation through spiracles
• C. By direct contact with the toxicant
• D. By disrupting the digestive system

Answer 1

Answer:

C. By direct contact with the toxicant

• Stomach poison: The insecticide applied on the leaves and other parts of the plant when ingested into the pest, act in the digestive system of the insect pest and bring about the death of the pest.

• Eg: Malathion, parathion

• Contact Poison: The pesticide or toxicant causes death of the pest species by means of contact

• Eg: Fenvalerate