Summary
In preliminary and more elaborate trials GA4/7 appeared to be an effective gametocide for Brussels sprouts, cabbage, cauliflower and kale.
After repeated spraying of 10, 50 of 100 mg GA4/7 per I isopropyl alcohol, during at least two weeks from the beginning of bolting, large numbers of male sterile flowers occurred during the early part of the flowering period. Many plants turned complete male sterile for periods up to 24 days.
It is concluded that, depending on the type of cole crop, higher quantities of GA4/7 or longer spraying periods are needed for permanent male sterility.
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References
Eenink, A. H., 1977. Induction of male sterility in lettuce (Lactuca sativa L.) by application of gibberellic acid: A technical note. Euphytica 26: 31–32.
Meer, Q. P. van der & J. L. van Bennekom, 1973. Gibberellic acid as a gametocide for the common onion (Allium cepa L.). Euphytica 22: 239–243.
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van der Meer, Q.P., Van Dam, R. Gibberellic acid as a gametocide for cole crops. Euphytica 28, 717–722 (1979). https://doi.org/10.1007/BF00038939
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DOI: https://doi.org/10.1007/BF00038939