What type of damage does the Black Grassbug cause?

• A. Circular brown spots on leaves
• B. Holes chewed in leaves
• C. Damage appears as irregular yellow or white spots on leaves
• D. White staining on stems

Answer: (C)

The main idea here is recognizing how a sap-sucking insect affects plant tissue. The Black Grassbug feeds by piercing leaf tissue and sucking out sap, which disrupts cells in patches. This creates irregular light-colored blotches on the leaves—yellow or white spots that aren’t neatly round or hole-like. It’s a stippling/chlorosis pattern typical of sap-sucking damage. Holes would suggest chewing insects, while circular brown spots or white staining on stems point to different damage patterns or pests, not this grassbug. So the best description of the damage is irregular yellow or white spots on leaves.