Question

why is the pesticide treadmill problematic?
farmers must increase the amount of pesticide the next time they spray for pests.
farmers must decrease the amount of pesticide next time they spray for pests.
farmers must always use the same pesticides as every other farmer on the treadmill.
farmers can never change pesticides once the treadmill is activated.

Explanation:

The pesticide treadmill refers to the cycle where pests develop resistance to pesticides, so farmers have to increase pesticide use (higher amounts or more frequent applications) to achieve the same pest control. The first option matches this concept: as pests become resistant, farmers must increase pesticide quantity in subsequent sprays. The second option is incorrect (decreasing wouldn't work against resistance). The third is wrong (farmers don't have to use the same as others). The fourth is incorrect (farmers can change pesticides, but resistance still drives the treadmill of increasing use/strength).

Answer:

A. Farmers must increase the amount of pesticide the next time they spray for pests.