· Grades, aphids per cone, percentage dry weight penalties and market values (per unit area) of hops of the variety Nugget in Spain harvested from 'Control' in 2002 and from all treatments in 2004 determined according to SAEFL and Barber et al. (2003) downgrades, assuming a production of 2100 kg of dry hops per hectare and a price of € per kg.