Apple drop on Zestar
Thank you for the question. Apples drop fruit starting with petal fall. This is normal as those fruits that were incompletely fertilized are shed from the tree. The second noticeable fruit drop occurs in June when the tree drops those fruits that are in excess of its ability to nourish to maturity. There are many things that factor in to fruit drop; nutrient availability, climatic conditions, summer pruning and insect infestations. Low soil fertility can also cause premature drop of apples. Soils low in magnesium or high in potassium can contribute to drop. We suggest a soil test to determine if this is an issue. The University of Minnesota Soil Testing laboratory can do this for your friend. Here is their website:http://soiltest.cfans.umn.edu/
Read more here to learn about fruit drop: http://msue.anr.msu.edu/news/why_does_apple_fruit_drop_prematurely
It can take 4-5 years after planting a new tree for it to produce a crop.
Thank you for contacting Extension.