What distinguishes selective pesticides from non-selective pesticides?

• A. Selective pesticides are effective on all pests
• B. Selective pesticides are toxic to specific pests, while non-selective are not
• C. Selective pesticides have no effect on beneficial organisms, while non-selective do
• D. Selective pesticides are always systemic

Answer: (B)

Selective pesticides have a narrow spectrum of activity: they are toxic to specific pests or pest groups, with much less impact on non-target organisms. This targeted action is what sets them apart from non-selective, broad-spectrum products that affect a wide range of pests (and often beneficial organisms) indiscriminately. In practical terms, using a selective pesticide helps control the intended pest while preserving helpful insects and the ecosystem, which is a key reason many pest-management plans prefer them. The other statements don’t fit this distinction: some selective products can still affect non-targets, not all are systemic, and broad-spectrum products are not limited to a single pest.