news and research about Pierce's Disease

What is Pierce's Disease?

Pierce’s Disease is a bacterial infection, which is spread by bugs that feed on grapevines, particularly the "glassy winged sharpshooter." Grapevines that become infected with PD can quickly become sick and die.

Pesticide residues from vine to wine

  • Author(s): Will, Frank; Gaubatz, Bernhard; Steinberg, Berthold; Weber, Manfred;
  • Abstract: The fate of some pesticides applied under field conditions was studied during processing of grapes (cv. Riesling) to wine. An untreated control was compared to raw material treated with pesticides according to recommended doses, to a sample from organic viticulture and to a sample with 10-fold higher application rates. Generally, the residue values in readily produced wines were very low and did not exceed ppb-levels. This was also true for the high-rate treated sample. Pressing, must clarification, fermentation and racking are important steps in diminishing pesticide residues. Must clarification reduced the residues from 40-50%.
  • Publication Date: Jan 1999
  • Journal: Mitteilungen Klosterneuburg