ISHS Acta Horticulturae 482: International Symposium on Cut Flowers in the Tropics
DETECTION OF POPULATION AGGREGATE OF WESTERN FLOWER THRIPS FRANKLINIELLA OCCIDENTALIS (PERGANDE) IN PLASTIC HOUSES OF ORNAMENTAL CROPS |
| Authors: | B. Orduz, A. Jiménez, D. Corredor |
| Keywords: | rose, Colombia |
| Abstract:
Thrips are one of the most difficult problems in the management of the low cut ornamental crops covered by plastic in the Bogotá Plateau. The objective of this study is to determine a system of sampling for the detection of population aggregates of western flower thrips Frankliniella occidentalis (Pergande) and to find out their possible origin. The monitoring of the thrips was carried out on a commercial block of roses during 25 weeks. 15 x 15 cm blue traps were used, inside and outside the plastic houses. Both types of traps were read and replaced weekly; in addition, a direct monitoring was carried out on rose terminals, reviewing 32 terminals per aisle each week. In addition, adhesive traps were designed for the stems, placing 200 on the lower part of the plants, and emergence traps were constructed, built with PVC cut tubes facing downward, in order to confirm the emergence of thrips from the soil. Results obtained established an aggregate disposition of thrips. The captures on the outside traps were highest on those places that were more open to air drafts. The stem traps evidenced the movement of thrips in the search of places of refuge or food, according to the stage of the insect. The results allow an explanation on the development of the focus or population aggregates of thrips possibly due to the multiplication of the endogenous population and not to the migration of exogenous population present. The sampling system that detected and located best the aggregate populations of thrips was the blue trap, which, besides being the most economic, is recommended inside green-houses, one per each aisle. | |
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