Which of the following is a disadvantage of using herbicides?

• A. They are cheap and effective
• B. They can cause poisoning and disrupt ecosystems
• C. They are not allowed in organic viticulture
• D. They have no effect on weed resistance

Answer: (B)

The main idea here is that herbicides carry health and environmental risks that count as disadvantages. When used in vineyards, they can be toxic to farm workers or nearby people if not applied carefully, and they may contaminate soil and water or harm non-target organisms, which can ripple through the entire vineyard ecosystem. These kinds of impacts are the core reason why using herbicides is viewed as a disadvantage.

In addition, herbicides can drive the development of herbicide-resistant weeds. As weeds adapt, effectiveness can decline over time, leading to more frequent or higher-dose applications and a cycle that increases risk to people and the environment.

Other statements describe advantages or policy or accuracy issues rather than the inherent downsides, so they don’t fit as well.