1. Inflorescence stretcher can be used for varieties with excellent fruit setting performance, such as Jingxiu of Eurasian species and Venus seedless of European and American hybrids.
Varieties that are prepared to use hormones to protect fruits, such as European and American hybrids Jingya and Fujiminori, can be used, but they must be sparse. Because the inflorescence of Fujiminori is elongated, hormones must be used to protect the fruit, which requires a lot of labor to make the fruit thin. At the same time, the ear of the fruit is very large and it is difficult to color evenly when it is mature, so it is not recommended.
Other varieties are not suitable for use, such as August, Victoria, Beauty Finger and Rizamat. , especially Kyoho grapes.
2. Correctly grasp that the concentration of gibberellin used in China is 5 mg/L, and that of American Qibao is 30,000-50,000 times, so the concentration should not be increased.
3. It is reasonable to determine that about 25 days after germination and 20 days before flowering, 6-7 leaves are suitable for new shoots.
4. For varieties like Jingya, which take supporting measures to protect the fruit, hormones must be used to protect the fruit when the fruit is about to fall, and fruit thinning must be carried out after the fruit is protected. In addition, to prevent gray mold.
You can go to the grape section of Guozhou Forum to learn.