(a) When the corolla length is 1.6 to 1.9 mm, ie 12 to 14 days before the flowering stage, the heads are soaked in 100 to 150 ppm gibberellin (920) solution and then processed again every 3 to 5 days. The rate can reach more than 95%. (b) One week after the flowering of the grapes, the panicles were soaked with 1000 ppm of gibberellic acid. The seedless rate was 93%. (C) Spraying grapevine inflorescence with 500 to 1000 times of 20% streptomycin can obtain more than 95% of non-nuclear fruit, because streptomycin does not work on fruit enlargement, and generally it is used in combination with gibberellin to increase yield. . Spray only when the spray blade is invalid, must be sprayed on the inflorescence, and do not spray after flowering, to be sprayed in the flowering period before the first three weeks are valid. However, it should be noted that early processing will cause more drop. It has been tested and is effective on a variety of grapes. The “Kyoho†cultivars all formed non-nuclear fruit when sprayed for the first 3 weeks of flowering to the initial flowering stage; “Rose-wool†cultivars were 100% free of nucleus-free rate when sprayed with mixed liquor before full bloom. (4) The self-made mixed cream can make the grapes non-nuclear and have large fruits and high yield. The amount of mixed cream: mix with 1% gibberellin, 1% 6-aminopurine, 10% white petrolatum and 88% refined lanolin. The method is to apply the mixed cream on the flower cob of the grape. China Agricultural Network Editor
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