Integrated pest management in the greenhouses of the national botanic garden of Belgium.
Integrated pest control methods were applied to 23 greenhouses in Belgium during 1989. The greenhouses contained various plant collections and were maintained at warm and temperate climates. The major pest species were the pseudococcid Planococcus citri, Tetranychus urticae, Trialeurodes vaporariorum and the coccid Saissetia coffeae. Twelve species of natural enemies were released. The aphelinid Encarsia formosa controlled T. vaporariorum, while release of Phytoseiulus persimilis controlled Tetranychus urticae and Leptomastix dactylopii and Leptomastidea abnormis controlled Planococcus citri. Generally, good control was attained, being better than conventional methods in several cases and the use of pesticides was substantially reduced.