Effects of concentration and application timing of streptomycin on berry and cluster characteristics of 'Fujiminori' grape [Vitis]
2009
Ishikawa, K.(Tokyo Univ. of Agriculture (Japan)) | Baba, T. | Fujisawa, H. | Seki, T.
Experiments were conducted to clarify the effects of lower concentrations of streptomycin (SM) application on seedlessness percentage and bunch quality of 'Fujiminori' grapes. 1) Application of 100 ppm or 200 ppm SM before flowering produced approximately 100% seedless berries. 100 ppm SM induced lager berries and rachis and lower acidity compared to 200 ppm SM (conventional). No deleterious effects were detected in berries treated with 100 ppm SM. 2) Application of 100 ppm SM with 25 ppm gibberellin (GA) at the flowering stage in aim to reduce labor also produced enlarged berries, but lowered seedlessness percentage compared to the single SM application before flowering. Application of 200 ppm SM with GA three days before full bloom produced berries that were nearly 100% seedless and of high quality in terms of color, sweetness and acidity.
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