Abstract
Abstract The effects of gibberellic acid (GA3), 1,2-dihydropyradizine 3,6-dione (maleic hydrazide), succinic acid-2,2-dim ethylhydrazide (SADH), (2-chloroethyl)phosphonic acid (ethephon) and their combinations on the growth and sex expression of the monoecious cucumber ‘SMR-58’ were studied. Maleic hydrazide (MH), SADH, and ethephon inhibited growth and induced femaleness when applied to foliage at concn of 500 ppm, 2000 ppm, and 100 ppm, respectively. Foliar sprays of 1500 ppm GA3 stimulated growth and increased maleness. The effect of GA was generally enhanced in combination with either MH, SADH, or ethephon. Combination of SADH and ethephon resulted in plants that were as short as those treated with SADH alone and as female as those treated w ith ethephon alone. Ethephon-SADH combination reduced plant size to the same extent as SADH alone and coned maturity.
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