Biological and integrated control in glasshouses in Poland.
Work is in progress in Poland on the integrated and biological control of Tetranychus sp., Trialeurodes vaporariorum (Westw.) and aphids on glasshouse crops. Phytoseiulus persimilis Athias-Henriot is introduced into glasshouses to control Tetranychus on cucumbers, roses, tomatoes and potted ornamental plants. On roses, conditions are unfavourable for the predator from June until August and chemical treatments are applied against Tetranychus, but only compounds with low toxicity to the predator (tetradifon, Milbex [which contains chlorfensulphide and chlorfenethol] or dicofol) are used. For aphid control in the presence of P. persimilis, the selective compound pirimicarb is used. The introduction of Encarsia has given good control of Trialeurodes on glasshouse tomatoes, and good control of Myzus persicae (Sulz.) on this crop has been obtained with the use of Diaeretiella rapae (M'Intosh). Good control of aphids on asparagus has been obtained by the introduction of Chrysopa perla (L.).