What characteristic differentiates multiple resistance from cross-resistance?

The characteristic that differentiates multiple resistance from cross-resistance is that multiple resistance involves different mechanisms. In the context of pesticide resistance, multiple resistance refers to the ability of a pest or weed species to withstand more than one chemical control agent, where each agent operates through distinct modes of action. This means that different underlying biological or physiological mechanisms are at play, allowing the organism to survive exposure to multiple types of pesticides.

In contrast, cross-resistance occurs when a pest or weed develops resistance to multiple chemicals that share a similar mechanism of action. In this case, a single change in the organism’s biology allows it to resist various substances that function in the same way.

Understanding this distinction is crucial for developing effective pest management strategies, as addressing multiple resistance may require a broader approach than simply rotating or managing one type of pesticide.