Question
Hi
I wanted to know if their are some foliar sprays which could help in setting of apples. I have mostly delicious variety in my orchards mamm and I am a commercial orchardist.
Waiting for your reply back.
Regards
Kapil chauhan

Answer
Dear Kapil, I am very honored to be of service to you.  Please let me know if I can assist you at any time in future.  Melissa


Dear  Kapil, I apologize for the delay in sending you this answer, but I wanted to make sure to send you enough information, and I actually bought a book on fruit production to help you and another client in India who are both growing apples.  
  There are several different sprays to spray apples with in order to get insect and disease free apples.  
1.    During the dormant season, when apples and leaves have fallen, clean up the ground of leaves, do any necessary pruning, and spray the tree with dormant oil, perhaps every two weeks if you see any bugs or have had diseases.  This will kill overwintering eggs of aphids, mites and control some diseases.
2.   When the tree starts showing green growing tips, spray the tree with sulfur (but not within three weeks of spraying with oil) for disease prevention; also spray with insecticidal soap or NEEM oil if aphids or mites are a problem.
3.   During the time from leaves to bloom, spray with sulfur (but not lime sulfur) for disease prevention; NEEM oil if you have aphids, mites or other bugs, Bacillus thuriengensis  for pest caterpillars (don抰 mix this with the sulfur spray, apply those separately).
4.   During first bloom, spray with sulfur and Bacillus if necessary, but don抰 use anything else to avoid any injury to bees.  Only spray with sulfur or Bacillus if you need to during this time.
5.   Petal fall is when the flowers are dropping off of the tree and are no longer being pollinated.  Now is when you can repeat the spray with sulfur and Bacillus again, and then spray with those 7-10 days later if needed or begin weekly kaolin clay spraying.  Kaolin clay products can be sprayed on weekly to keep away apple maggots and other apple pests.  
6.   When the fruit is set and begins developing, keep a close watch out for any signs of disease.  You will want to spray with sulfur spray or Bordeaux if you see any signs of disease on either the fruit or the leaves, every 10-14 days as fruits develop.  Stop spraying 30 days before expected harvest.  
In addition, if you have cedar trees nearby, you are in danger of developing cedar apple rust, so eliminate those plants if possible.  If not, you will have to spray with fungicide to control this.  The time to spray will be from silver tip (when the tree is almost out of being dormant and the tip of the buds are silver before they turn green with the first leaves), again after petal fall, and another spray again 10 days later.  In addition, any remaining cedar trees should be looked at, and collect and destroy any galls in the trees.
  In addition, keeping your orchard clean and free of old leaves and weeds is very important to get the best apples.  I know it sounds like a lot, but remember, some of the additional spraying you only need to do if you see problems, like bugs and spots on fruit or leaves.
  Now if there is anything that you don抰 understand, or any chemicals you can抰 find, please let me know, and I will try to locate that chemical or another one that will work.   I believe these methods are mostly organic, so they should be easy to find.  Now, here is something interesting that I would like to share with you.  I usually look up the location of my foreign clients to better understand what their climate is like, and was surprised to see that Chandigahr is located right next to Dehra Dun where my second cousin lives!  It is truly a small world.  I hope you will forgive me for taking so long in sending you this answer, but I hope my information is helpful to you.  Best wishes, Melissa