The results of the four trials to determine the effects of different defoliation treatments on garlic yield, carried out in the Central Ebro Valley (Spain), are presented. Four defoliation levels of 0 (control), 33, 66 and 100% were applied at seven different developmental stages. The results demonstrate a close relationship between yield reduction and the defoliation treatment inflicted. The higher the defoliation level, the higher the yield reduction. Defoliation imposed at the onset of bulb formation resulted in maximum yield reduction.
