Which soybean pest is notorious for rapid population growth and feeding on leaves?

• A. Stink bugs
• B. Soybean aphid
• C. Fall Armyworm
• D. Potato leafhopper

Answer: (B)

Explosive population growth on soybean leaves points to the soybean aphid. This pest reproduces very quickly, often starting with parthenogenetic females that produce many offspring, so populations can swell in a short time under favorable conditions. They feed on the plant’s phloem, causing leaves to curl, yellow, and stunt growth, which can lead to substantial yield losses when densities are high. Winged adults also disperse to new plants, enabling sudden outbreaks across a field. The other insects listed do feed on leaves or affect soybeans, but their usual patterns differ: stink bugs mainly attack seeds and pods, not rapid leaf defoliation; a generalist caterpillar can defoliate but isn’t tied to soybean-specific explosive outbreaks; and potato leafhoppers cause leaf stippling and curling in multiple crops, but soybean aphid is the pest most notorious for rapid leaf-feeding population growth on soybeans.