Concentration Levels of Imidacloprid and Dinotefuran in Five Tissue Types of Black Walnut, Juglans nigra

Forests

Katheryne Nix¹  Paris Lambdin¹  Jerome Grant¹  Carla Coots¹ 

[1] Department of Entomology and Plant Pathology, The University of Tennessee, 2505 E.J. Chapman Drive, 370 Plant Biotechnology Building, Knoxville, TN 37996, USA; E-Mails:

关键词: black walnut;    imidacloprid;    dinotefuran;    chemical concentration;    thousand cankers disease;   

DOI  :  10.3390/f4040887

来源: mdpi

【 摘 要 】

Black walnut, a valuable economic and environmentally important species, is threatened by thousand cankers disease. Systemic imidacloprid and dinotefuran applications were made to mature black walnut trees to evaluate their translocation and concentration levels in various tissue types including leaf, twig, trunk core, nutmeat, and walnut husk. The metabolism of imidacloprid in plants produces a metabolite, olefin-imidacloprid, which has been documented to have insecticidal properties in other systems. Trunk CoreTect (imidacloprid) soil pellets and a trunk spray of dinotefuran were applied to mature black walnuts in spring 2011. Imidacloprid concentrations were detected in both the lower and upper strata in all tissue types tested and progressively increased through month 12 post-treatment in twig and leaf tissue. Olefin-imidacloprid was detected in the nutmeat and walnut husk. Dinotefuran was only detected in the first sampling period and was found in low concentration levels in leaf and twig tissue types, and was not detected in the trunk, nutmeat or the walnut husk.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.