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Population dynamics of the green­house whitefly Trialeurodes vapora­riorum (Westwood) was studied in a tomato crop by using sticky yellow traps. The plastic pipe used as a trap was 0.1 m in diameter and 1.5 m high. The number of adult whiteflies was coun­ted by square centimeter and the traps were divided in higher, medium, and lower vertical sections of 0.45 m each. These sections were subdivided into nine horizontal strips of 0.05 m wide each. A good estimate of the population was obtained by counting the whiteflies on four of the nine horizontal stripes for a vertical section. According to the age of the tomato crop, the lower vertical section of the trap has to be sampled from day 1 to 30, the medium section from day 31 to 50, and the higher sec­tion of the trap from day 51 to 112.

ESPAÑOL, J. A., & CORREDOR, D. (1989). A METHODOLOGY FOR THE READING OF YELLOW TRAPS USED IN THE EVALUATION OF WHITE FLY IN A COMMERCIAL TOMATO CULTIVATION. Revista Colombiana De Entomología, 15(2), 36–42. https://doi.org/10.25100/socolen.v15i2.10184