Articles
USE OF TWO PREDATORS PHYTOSEIULUS PERSIMILIS ATHIAS-HENRIOT (ACARI: PHYTOSEIIDAE) AND NEOSEIULUS CALIFORNICUS (MCGREGOR) (ACARI: PHYTOSEIIDAE) FOR THE BIOLOGICAL CONTROL OF TETRANYCHUS URTICAE KOCH (ACARI: TETRANYCHIDAE) IN ROSES IN THE BOGOTA PLATEAU
Article number
482_38
Pages
259 – 268
Language
Abstract
Previous studies undertaken on a small-scale in the Horticulture Research Centre (CIAA) of the University Jorge Tadeo Lozano showed that Phytoseiulus persimilis is able to control Tetranychus urticae under local greenhouse conditions.
The objective of this study was to amplify the previous experience to a commercial scale and to determine the possibility of the integrated use of both P. persimilis and N. californicus. The experiment was developed in three sites with established roses in the Bogota plateau: the CIAA and two commercial flower farms, Mocari and Las Flores.
Effective control was obtained in the CIAA by releasing between 3.6 and 12 predators per plant.
In the commercial farms, the predators established themselves in the focal points only and were not able to control T. urticae. In Las Flores between 22 and 47 predators, mainly P. persimilis, were released per plant.
These predators initially became well established; however, within two weeks they disappeared.
In Mocari, between 6 y 21 predators per plant were released, again mainly P. persimilis.
In this latter case, very few were found in the ensuing samples.
The results in the CIAA show that through the use of both predators adequate pest control can be obtained on a commercial scale.
The problems encountered on the commercial farms were attributed to pesticide residues and to the fail to integrate cultural and phytosanitary practices, as well as of the personnel in charge of managing the trial plots.
The objective of this study was to amplify the previous experience to a commercial scale and to determine the possibility of the integrated use of both P. persimilis and N. californicus. The experiment was developed in three sites with established roses in the Bogota plateau: the CIAA and two commercial flower farms, Mocari and Las Flores.
Effective control was obtained in the CIAA by releasing between 3.6 and 12 predators per plant.
In the commercial farms, the predators established themselves in the focal points only and were not able to control T. urticae. In Las Flores between 22 and 47 predators, mainly P. persimilis, were released per plant.
These predators initially became well established; however, within two weeks they disappeared.
In Mocari, between 6 y 21 predators per plant were released, again mainly P. persimilis.
In this latter case, very few were found in the ensuing samples.
The results in the CIAA show that through the use of both predators adequate pest control can be obtained on a commercial scale.
The problems encountered on the commercial farms were attributed to pesticide residues and to the fail to integrate cultural and phytosanitary practices, as well as of the personnel in charge of managing the trial plots.
Authors
R. de Vis, A.J. Barrera
Keywords
Spider mites, Colombia, commercial scale, greenhouse conditions
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