The document summarizes two tests on the translocation of insecticides in trees after trunk injection. In the first test using three different injection methods on Celtis australis, the Arborjet system showed the insecticide solution rapidly moving into the xylem but stopping after 5 hours. The second test on Tilia x europaea showed that for all injection systems, translocation of the injected solution stopped approximately 2 days after injection. The conclusion is that further testing is needed to understand why translocation stops so quickly after trunk injection.

1. 2 éme CONFERENCE SUR L’ENTRETIEN DES ESPACES VERTS, JARDINS, GAZONS, FORETS, ZONES AQUATIQUES ET AUTRES ZONES NON AGRICOLES Angers 28-29 Octobre 2009 TRANSLOCATION OF INSECTICIDES IN TREES L. Cevenini, A. Minelli Department of Fruit Sciences – Landscape unit Alma Mater Studiorum – University of Bologna

6. RESULTS 1° test Cut 1 (cm) Cut 2 (cm) Cut 3 (cm) Arboprof ® Organic colouring 29.3 44.3 11.7 Organic colouring + Azadirachtin 13.3 10 15 Arbocap ® Organic colouring 12.7 8.3 18.3 Organic colouring + Azadirachtin 13.3 13.3 21.6 Arborjet ® Organic colouring 25 26.7 27 Organic colouring + Azadirachtin 25 40 40

7. RESULTS 2° test Cut 1 (cm) Cut 2 (cm) Cut 3 (cm) Arboprof ® Organic colouring 45 48 38.5 Organic colouring + Azadirachtin 45 37.5 41.6 Arbocap ® Organic colouring 17.3 18.3 20 Organic colouring + Azadirachtin 56.6 83.3 76.6 Arborjet ® Organic colouring 158.3 140 263 Organic colouring + Azadirachtin 97.5 133 130