LABORATORY AND FIELD EVALUATIONS OF NEONICOTINOID INSECTICIDES AGAINST THE GLASSY-WINGED SHARPSHOOTER

• Author(s): Byrne, Frank; Toscano, Nick; Drake, Ben; Gispert, Carmen;
• Abstract: Imidacloprid is still the most widely used neonicotinoid for the protection of grapevines against glassy-winged sharpshooter (GWSS) feeding and Pierces disease (PD) transmission. This insecticide has now entered the generic age and within the past year, several new formulations of imidacloprid have been launched onto the market. To assist with grower acceptance of these new formulations, we are currently evaluating the uptake of different products in table and wine grapes. Bayer CropScience introduced Admire Pro to replace their original Admire 2F formulation. In Coachella Valley, the imidacloprid uptake profiles for vines treated with either Admire Pro or Admire 2F were similar, with peak uptake occurring within four days. In a further study, the uptake profile for Admire 2F was also consistent with a second soluble concentrate formulation (Nuprid 2F, marketed by Nufarm Americas Inc.). We evaluated the performance of the neonicotinoid thiamethoxam (applied as Platinum) at three rates of application in a Temecula Valley wine grape vineyard. The concentrations of thiamethoxam in xylem fluid extracts were highest at the top application rates, and would provide good protection to vines against a sharpshooter infestation.
• Publication Date: Nov 2006
• Journal: 2006 Pierce's Disease Research Symposium