fruit growth suppression

Citrus fruit growth elimination / suppression / retardation.

In a backyard: 2 citrus trees, 1 Tangelo and 1 Lemon 
~ 20 years old, each 30+ ft tall, no fertilizer applied ever, 
seldom watered, pruned every 2-3 years, but each one
is yielding, year after year, approximately ten (10!) full
35 gallon barrels of huge, juicy tangelos and lemons.

== Problem: Fruits are ready all at one time. Too many!!

== Comments: (1) "Fruit Eliminator", (Cl-Et-PO2Na) does 
not mention any effectiveness on nor use for citrus trees 
and cautions about leave discoloration. Despite this info, 
does anyone have positive ex. with it (1) on citrus trees.
(2) I hate to do annual, manual blossom plucking.

== Request: What can be sprayed onto these blossoms
that will eliminate or at lest diminish this unwanted bounty?
hanson