Sticky card counts in greenhouse IPM use which standardized method?

• A. 1-Inch Vertical Column Method
• B. 4-Inch Square Method
• C. 2.5-Centimeter Grid Method
• D. Visual Estimation

Answer: (A)

Consistent sampling area is essential for comparing pest levels over time and across locations in greenhouse IPM. The 1-Inch Vertical Column Method uses a narrow, one-inch-wide vertical strip along the length of the sticky card as the sampling zone. You count all pests that appear in that strip and then express the result per card or per strip. This approach keeps the data comparable because every card is measured in the same way, regardless of card size or trap placement, making trends easier to interpret for management decisions.

Other methods tend to be more time-consuming or subjective. A fixed 4-inch square or a centimeter grid increases counting effort and can introduce variability if pests aren’t evenly distributed. Visual estimation lacks precision and reproducibility, leading to less reliable trend data.