What are two substances an organic farmer can use as a last resort against pests?

• A. herbicides and fungicides
• B. sulfur and rotenone
• C. chemical pesticides and fertilizers
• D. insect traps and repellents

Answer: (B)

In the context of organic farming, it's important to use substances that align with organic practices and regulations. Sulfur and rotenone are both considered organic options for pest control when other methods have failed. Sulfur, a naturally occurring mineral, has been used for centuries as a fungicide and insecticide, making it a viable choice in organic agriculture. Rotenone, derived from the roots of certain tropical plants, is effective for controlling a variety of pests, especially leaf-eating insects.

These options represent a last resort approach that is consistent with the principles of organic farming. They aim to minimize harm to the ecosystem while still managing pest populations effectively. In contrast, the other choices include synthetic chemicals or practices that do not adhere to organic standards.