"TRADE OR OTHER NAMES: The active ingredient ethephon is found in a variety of commercial herbicides. Trade names for products containing ethephon include Arvest, Bromeflor, Etheverse, Flordimex, Flordimex T-Extra, Cerone, Etherel, Chipco Florel Pro and Prep (223, 316).
REGULATORY STATUS: Ethephon is a general use pesticide (GUP). Check with specific state regulations for local restrictions that may apply. Products containing ethephon carry the Signal Words "Danger", "Warning", or "Caution" depending on the product (223).
CHEMICAL CLASS: organic phosphorus compound / ethylene generator / plant growth regulator
INTRODUCTION: Ethephon is a plant growth regulator. Its use varies with plant species, chemical concentration, and time of application. Ethephon regulates phases of plant growth and development by application to various growth sites (1). It is currently registered in the U.S. for use on apples, barley, blackberries, bromeliads, cantaloupes, cherries, coffee, cotton, cucumbers, grapes, guava, macadamia nuts, ornamentals, peppers, pineapples, rye, squash, sugarcane, tobacco, tomatoes, walnuts, wheat, etc. (1, 223, 207). Ethephon's mode of action acts via liberation of ethylene, which is absorbed by the plant and interferes in the growth process (1). It is also used in the acceleration of ripening of fruits and vegetables (302). Ethephon comes in RTU (ready-to-use), emulsifiable concentrate and aqueous solution formulations (223, 316). It may also be used in combination with Terpal (with mepiquat-chloride) and Terpal C (chlormequat-chloride) (223)."
Source http://extoxnet.orst.edu/pips/ethephon.htm