The control method that is weed-species specific, but inexpensive to maintain, is:

• A. Mechanical Control
• B. Chemical Control
• C. Biological Control
• D. Cultural Control

Answer: (C)

Biological control relies on living organisms, such as insects, fungi, or pathogens, that specifically target a weed species. Because these natural enemies are chosen for their precision, they tend to attack only that weed, causing minimal impact on crops and other plants. Once released and established, they reproduce and continue suppressing the weed with little ongoing input, making maintenance inexpensive over time.

Mechanical control, by contrast, involves physical removal or disruption and requires ongoing labor, and it’s not inherently selective. Chemical control uses herbicides that can affect broader plant groups and typically needs repeated applications, adding up in cost and effort. Cultural control, while useful, focuses on farming practices to reduce weed pressure and doesn’t inherently provide the targeted, low-maintenance suppression biological control offers.