(Decanter) - The organic and biodynamic winemaking lobby uses 'emotional black magic' to get its message across, a prominent consultant will argue in a debate next month. Viticulturalist Richard Smart is going head to head with biodynamic evangelist Monty Waldin (pictured) in a debate at the London headquarters of the Wine and Spirit Education Trust. They are equally passionate in their views. Smart says his approach to viticulture is ‘based on conventional science, and not emotional “black magic”.’ ‘Organic [and] biodynamic producers considerably overstate the benefits of their approach to wine quality, consumers’ health and the environment,’ he argues.