Control of thrips on leek: are chemical products still helpful? | Lutte contre le thrips sur le poireau: les moyens chimiques suffisent-ils?
2009
Aviron, S. | Krauss, J | Baur, R., Station de recherche Agroscope Changins-Waedenswil ACW, Waedenswil (Switzerland)
In Switzerland, thrips (mainly T. tabaci) infestations often lead to substantial damage on leek crops in spite of a large variety of approved insecticides. Field experiments were realised in 2008 by ACW atWädenswil in order to evaluate the efficacy of chemical control methods against thrips. A first assay conducted over a short cultural period (eleven weeks) revealed a good efficacy of the insecticides Perfekthion, Audienz and Vertimec after three consecutive applications. However, in a second assay realised to protect leek over the whole growing period, neither alternate applications of carbamates and organophosphates, nor multiple treatments with pyrethroids prevented substantial damage symptoms at harvest. The efficacy of insecticides can be improved by optimising the spraying techniques, as well as the timing and frequency of treatments during the season. However, alternative control methods should be developed for a better control of thrips damage on leek crops.
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