Gibberellic acid as a gametocide for the common onion (Allium cepa L.). II. The effect of GA 4/7

Summary The gametocidal effect of Berelex GA 4/7 on onions was investigated. Frequent spraying during the bolting period with relatively high concentrations (0.1 and 0.3%) resulted in a very high percentage of completely male sterile plants in the beginning of the flowering period. The gametocidal effect was accompanied by a considerable reduction in seed production.Differences in reaction to GA 4/7 between the three varieties involved were small.