Which type must be sprayed on the insect to be effective?

Which type must be sprayed on the insect to be effective?

• A. Contact Poisons
• B. Systemic Pesticides
• C. Stomach Poisons
• D. Pre-Plant

Answer: (A)

Direct contact is required for this type of action. A contact poison works when the chemical touches the insect’s body; spraying it on the insect or on surfaces the insect touches allows the toxin to act through contact. In contrast, systemic pesticides move within the plant and affect insects that feed on plant tissues, while stomach poisons must be ingested by the insect. Pre-plant is about timing and application strategy, not how the pesticide affects the insect. So the option that must be sprayed directly on the insect to be effective is the contact poison.

Direct contact is required for this type of action. A contact poison works when the chemical touches the insect’s body; spraying it on the insect or on surfaces the insect touches allows the toxin to act through contact. In contrast, systemic pesticides move within the plant and affect insects that feed on plant tissues, while stomach poisons must be ingested by the insect. Pre-plant is about timing and application strategy, not how the pesticide affects the insect. So the option that must be sprayed directly on the insect to be effective is the contact poison.