It is well known that gibberellins A4 (GA4) and A7 (GA7) are effective in increasing fruit size and improving skin finish in apples. Less well known is the fact that GA7 is less effective than GA4 in terms of fruit size and russet control. GA7 also adversely affects the level of return bloom. Fine’s GA4/7 is produced using a unique fermentation process that produces very high purity GA4 with insignificant levels of GA7. Perlan delivers the power of GA4 without the legacy of high GA7. Trials at universities and research centers across the globe confirm this.

Perlan also contains 6-benzylaminopurine (6-BAP), which has an additional effect on fruit size. Furthermore, 6-BAP causes the fruit, particularly in Red Delicious varieties to lengthen and to take on a more typy shape. This is a favorable feature for many markets.