Apple Thinning With Sevin®
Agricultural Insecticide

Apple thinning is a process by which fruitlets are removed from apple trees early in the season.  This allows for the remaining fruitlets to grow into larger fruit, which are more desirable.  Apple thinning can be done manually by walking through the orchard and removing fruitlets at the ideal time.  Sevin can also be used for thinning as it causes the majority of fruitlets to fall off, leaving only the king bloom, which is the most desirable fruitlet.  Application timing is very important as this will determine the success of using Sevin for thinning.

Application Tips and Timing

• Apply when fruitlets are between 3 mm and 20 mm under ideal conditions or approximately 10-25 days after full bloom
• For most consistent thinning effect, apply Sevin when daytime temperatures will be above 70⁰ F (21⁰ C) for three days and during period when foliage remains moist for 30 minutes
• Early morning is a good time to spray when temperatures are climbing and trees are becoming physiologically active
• Evenings are also good because trees remain wet longer and, in most conditions, will dry as the next day begins
• Apply varieties vary in their response to thinning applications of Sevin.  Experience in the orchard and consultation with local experts are invaluable to achieving the desired outcome
• Always read and follow label directions