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Integrated pest control against Ips typographus Combined use of pheromones and the systemic insecticide methamidophos



Integrated pest control against Ips typographus Combined use of pheromones and the systemic insecticide methamidophos



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 101(5): 508-518



IPIDEX, a paste containing the systemic insecticide methamidophos, is spread as a strip 20 cm wide and about 2 mm thickness to the pretreated bark of spruce and protected with foil. The treatment is performed between the end of March and the middle of April, according to the height a.s.l.; some weeks later, immediately before the attack of beetles, trees are baited with a pheromone dispenser (Pheroprax for Ips typographus and Chalcoprax for Pityogenes chalcographus). Spruce inside a circle of about 10 m around the pheromon tree are created with IPIDEX only. The insecticide is translocated in the ascending sap in upward direction only and has reached during this time interval the top of the tree, killing beetles boring in until the middle of June (halflife in spruce 40-45 d, 15 degree C). The insecticide is present only inside the tree and no outwashing or evaporation can be observed. The rapid degradation in the bark beetle (halflife about 2 h) and the smell of a repellent at the site of application as well prevent unwanted ecological side effects. Extensive experiments during the increase of bark beetle gradation 1992/93 in southern Germany yielded the decrease of freshly attacked trees inside the near environment of the experimental locations in 1992 to 4-14 and in 1993 to 18-28%, relative to the number of attacked trees in the year before, although IPIDEX was applied once only in spring against the first but not later against the second generation of Ips typographus.

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