1. Gibberellin (GA): Its main function is to promote plant division and cell elongation and growth. The application of GA before flowering can make the development of pollen and ovule abnormal, and the application of GA after flowering can promote the cell growth. It is a common growth regulator to induce grape to form seedless fruit. Generally, the concentration used before flowering is 50- 100 mg/kg, and the concentration is reduced to 25-50 mg/kg after flowering.
2. Streptomycin (SM) is an antibiotic, but not a growth regulator. In the process of inducing seedless fruit, treatment with streptomycin before flowering can inhibit the development of pollen and ovule. So as to form seedless fruit. Generally, it is mixed with GA 10- 15 five days before flowering, and the common concentration is 100-300 mg/kg. When used alone, it usually makes the fruit smaller.
Seedless treatment method of grape fruit
1, fruit setting before flowering: 7- 14 days after flowering 100mg/kg GA, the first treatment is aimed at inducing seedlessness, and the second treatment is aimed at increasing fruit size.
2. The inflorescence is treated once at flowering stage and once after fruit setting: some varieties, such as Xianfeng, have serious side effects before flowering, but the inflorescence is soaked with 10-25mg/kg Ga, and after 10- 15 days, the mixed solution of 25-50mg/kg Ga+5mg/kg Ba is used again.
3. One-off treatment after flowering: This method is only applicable to aneuploid varieties such as Galway. Within 3-5 days, when the corolla is cracked and the ovary is exposed, dip the ear with 50- 100 mg/kg GA, and a large seedless fruit can be formed with only one treatment.
As a commercial seedless fruit, the seedless rate should be above 95%, and the seedless rate of high-grade seedless grapes should reach 100%.
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