Integrated pest management in Dendranthema indicum | [Lutte intégrée chez Dendranthema indicum]
1999
Albert, R. ((Landesanstalt fuer Pflanzenschutz, Stuttgart (Germany).)
Many pest species attack chrysanthemums. The most important pests in Germany are Frankliniella occidentalis, Thrips tabaci, Tetranychus urticae, Liriomyza huidobrensis, Phytomyza sp., Macrosiphoniella sanborni, Myzus persicae and Aphis gossypii. Sometimes caterpillars can be found on the plants. This attack often requires regular weekly applications of pesticides in chrysanthemum. Experiments with the repeated introduction of beneficials, the integration of pesticides and of a botanical (NeemAzal-T/S) have been conducted to control these pests. Excepting F. occidentalis and M. sanborni all pest species were controlled well with beneficials. Due to an increase of the thrips population in the summer time the thrips had to be controlled with insecticides in that time. Nevertheless the application of beneficials and insecticides reduced the yearly consumption of insecticides by about 80 /. Looking for an integratable insecticide, a new neem formulatiun (NeemAzal-T/S) was tested. Both the combination of pesticides and NeemAzal-T/S or beneficials and NeemAzal-T/S had very good results in thrips control. When NeemAzal-T/S is applied at weekly intervals, none of the other pest species can be found on the plants. When the neem formulation is applied at longer intervals some pest species like Aphis gossypii infect the plants. Then the integration of insecticides or beneficials is necessary
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