How was Opuntia brought under control in Australia?

Explanation

**Step-by-Step Solution:**

1. **Identify the Problem**: Opuntia, commonly known as prickly pear cactus, was introduced to Australia and became an invasive weed, causing significant ecological and agricultural damage.

2. **Understand the Context**: Opuntia was initially brought to Australia for the production of red dye. However, it proliferated uncontrollably, leading to negative impacts on the environment and land use.

3. **Introduce the Solution**: To control the overgrowth of Opuntia, a biological control method was employed. This involved the introduction of a natural predator to the invasive species.

...