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Exceeding the threshold value for Trioza apicalis Förster 1848 in carrot fields did not cause damage as revealed during monitoring in Germany from 2017–2020

GND
1172208123
Affiliation
Julius Kühn-Institute (JKI), Institute for Plant Protection in Horticulture and Forests, Germany ; Humboldt-Universität zu Berlin, Division Urban Plant Ecophysiology, Faculty of Life Sciences, Thaer-Institute of Agricultural and Horticultural Science, Germany
Sauer, Jasmin;
Affiliation
Julius Kühn-Institute (JKI), Institute for Plant Protection in Horticulture and Forests, Germany
Dewert, A.;
Affiliation
Gottfried Wilhelm Leibniz Universität Hannover, Institute of Horticultural Production Systems, Section Phytomedicine, Applied Entomology, Germany
Hondelmann, P.;
Affiliation
Gottfried Wilhelm Leibniz Universität Hannover, Institute of Horticultural Production Systems, Section Phytomedicine, Applied Entomology, Germany
Meyhöfer, R.;
GND
1058983830
Affiliation
Julius Kühn-Institute (JKI), Institute for Plant Protection in Horticulture and Forests, Germany
Hommes, Martin;
Affiliation
Naturland Fachberatung-Öko-BeratungsGesellschaft mbH, Germany
Buck, H.;
Affiliation
Humboldt-Universität zu Berlin, Division Urban Plant Ecophysiology, Faculty of Life Sciences, Thaer-Institute of Agricultural and Horticultural Science, Germany
Ulrichs, C.;
GND
1172208549
Affiliation
Julius Kühn-Institute (JKI), Institute for Plant Protection in Horticulture and Forests, Germany
Vogler, Ute

The carrot psyllid Trioza apicalis Förster 1848 is a carrot pest in Europe that can cause serious damages in case of massive occurrence. Damages up to a total loss of yield have been reported from Scandinavian countries but also from Switzerland. The action threshold to control the pest with chemical pesticides is 0.2 T. apicalis per day and trap caught by sticky traps. We investigated the number of T. apicalis with sticky traps on carrot fields of the study regions Lüneburg/Uelzen and Hameln/Bad Pyrmont in Germany, during the period 2017–2020. The number of T. apicalis caught was generally very low in both study regions. On several fields in successive weeks almost no individuals were found in the study region Hameln/Bad Pyrmont. In Lüneburg/Uelzen was at least one field each year where the number of carrot psyllid was clearly higher than in all other fields and exceeded the threshold level. Surprisingly on carrot fields in close proximity to carrot fields from the previous year, the T. apicalis numbers were only slightly increased. Nonetheless, no loss of yield was reported for any of the fields in the four years of the study, although the generally defined threshold has been exceeded on many of the investigated carrot fields.

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