Resumen

CARRIZO, Paola; BENITEZ, Daniel  y  BERTOIA ESTANGA, Emiliano. Protocolo de recuento reducido para cinco tamaños diferentes de trampas adhesivas amarillas utilizadas en el monitoreo de Frankliniella occidentalis (Pergande). Agronomía Trop. [online]. 2004, vol.54, n.1, pp.5-16. ISSN 0002-192X.

One of the reasons for the reduced use of sticky traps by growers is that counting takes a considerable amount of effort and time, which increases with as trap size. We examined the influence of higher trap sizes, in order to apply a method of reduced counting, named least surface counting. Sticky yellow traps of five different sizes were placed in pepper greenhouses (n=10). Counting was performed on the whole trap and six different designs of reduced counting. A paired t-test was performed on differences between trap faces. Since meaningful differences were obtained in 96% of tests, each face was considered as independent, doubling the number of data sets. Then, a paired t-test was performed to test the difference between counts/cm² in the whole trap and on those six designs. Number of captures/cm² at every design was equal or meaningfully higher than in the whole trap. It demonstrated a clustering of insects on its surface, which seemed to increase with size. The most stable performance along the five sizes tested was obtained by counting two horizontal strips -tops and bottoms- which means counting around 40% of total surface. Thus, that previously fitted method is adequate to predict western flower thrips caught when performed on yellow sticky traps from 100 to 750cm².

Palabras clave : Yellow sticky traps; counting time; Frankliniella occidentalis.