SUGGESTIONS FOR THE USE OF ETHEPHON (ETHREL*) FOR PROMOTING 

 UNIFORM RIPENING AND RED COLORING ON APPLE TREES 



W.J. Lord and D.W. Greene 

 Department of Plant and Soil Sciences 



Eth 

 ducers a 

 this mat 

 b 1 e soli 

 sible to 

 qual i ty 

 enabl es 

 the tree 

 and/or a 

 tens i fy 

 conditio 

 channel s 

 that mus 

 price. 



ephon 

 nd CO 

 e r i a 1 

 ds an 



adva 

 f rui t 

 the g 

 s at 

 n una 

 our c 

 n wit 



of a 

 t be 

 Ethep 



IS p 

 nsume 



will 

 d has 

 nee t 

 s for 

 rower 

 the f 

 V i d a 

 urren 

 h the 

 n exc 

 sold 

 hon m 



rovi ng 



rs of a 

 s t i m u 1 

 ten fru 

 he mark 

 these 

 to har 

 irst pi 

 ble del 

 t probl 

 Mclnto 

 e s s i V e 

 quickly 

 ust be 



to be 

 pples 



ate re 

 it mat 

 e t i n g 

 early 

 vest a 

 eking, 

 ay in 

 ems of 

 sh var 

 vol ume 

 becau 

 used w 



of si 

 becau 

 d col 

 u r i ty 

 seaso 

 sal es 



larg 



Nev 



harve 



supp 

 iety. 



of e 

 se of 

 i th c 



gnifi 

 sea 



or de 

 . Th 

 n of 

 . Fu 

 er pe 

 erthe 

 St fo 

 ly ma 

 The 

 theph 

 over 

 a u t i 



cant 

 preha 

 vel op 

 ese r 

 apple 

 rther 

 rcent 

 less, 

 1 1 owi 

 nagem 

 plac 

 on-tr 

 -matu 

 n! 



value to 

 rvest, ap 

 ment, in 

 esponses 

 s and to 

 more, th 

 age of h 



misuse 

 n g its u 

 ent and 

 ement in 

 eated Mc 

 rity cou 



both 

 pi ica 



creas 



make 



have 



is ch 



is cr 



of et 



se CO 



poor 



mark 



Intos 



Id de 



pro- 

 t i n of 

 e solu- 



i t p s - 



high 

 emi cal 

 op from 

 hephon 

 u 1 d i n - 

 fruit 

 e t i n g 

 h apples 

 press 



Success ful Use of Ethephon 



for d 

 has b 

 to ap 

 are n 

 ature 

 to de 

 not b 

 most 

 sized 

 col or 

 of et 

 their 

 col or 



soft 

 1 em 

 dense 

 d u r i n 

 cedur 

 crop 

 the t 



Ethep 

 evel 

 een t 

 pi es 

 ormal 

 s, ex 

 vel op 

 ring 

 usef u 



tree 

 ed f r 

 hepho 



i nte 

 ed f r 



and t 

 f obt 

 tree 

 g the 

 es sh 

 1 oad 

 ree b 



hon w i 

 pment 

 hat et 

 within 

 ly ass 

 c e s s i V 

 red c 

 col or 

 1 on y 

 s of m 

 u i t s a 

 n , 1 ar 

 r i r w 

 u i t s 



hus su 

 a i n i n g 

 s can 



summe 

 oul d b 

 and pe 

 ef ore 



11 no 



of re 



hepho 



7 da 



c i a t 

 e vig 



01 or 

 up to 

 oung 

 odera 

 re no 

 ge, d 

 ith i 

 btai n 



itabl 

 adeq 

 be CO 

 r and 

 e fol 

 rmi t 

 the a 



t comp 

 d col 

 n trea 

 ys aft 

 e d wit 

 or, or 

 may be 



satis 

 trees 

 t e vig 

 rmal ly 

 ense t 

 nadequ 



adequ 



e only 

 uate c 

 rrecte 

 doi ng 

 1 owed 

 better 

 p p 1 i c a 



letel 



r. 



tment 



er ap 



h poo 



dens 



so 1 



facto 



of me 



or f r 



harv 



rees 



ate r 



ate c 



for 

 ol or 

 d som 

 some 

 by sp 



ligh 

 tion 



y ove 

 ur ex 

 s add 

 pi ica 

 r fru 

 e tre 

 ow th 

 ry le 

 di um 

 om wh 

 ested 

 will 

 ed CO 

 ol or, 



juice 

 on th 

 ewhat 

 light 

 ot pi 

 t pen 

 of an 



rcome con 



perience 



ed only a 



tion. U n 



it color, 



es, the a 



at a d d i ng 



vel s . Th 



vigor or 



i c h a h i g 



in one p 



still h a V 



lor. By 



they wil 



or immed 



e interio 



by pulli 



summer p 



eking, wh 



etration 



ethephon 



d i t i n 

 the pa 

 bout 1 

 der CO 



such 

 b i 1 i ty 

 etheph 

 erefor 

 wel 1 -p 

 h perc 

 i c k i n g 

 e many 

 the ti 

 1 prob 

 iate s 

 r f rui 

 ng the 

 runi ng 

 i c h w i 

 into t 



spray 



s unfa 

 St two 

 0-20% 

 n d i t i 

 as h i g 



of th 

 on s t i 

 e , eth 

 runed , 

 entage 

 . Des 



fruit 

 me the 

 ably b 



al e . 

 ts of 

 water 

 . The 

 n lig 

 he i n t 



vorabl e 

 years 

 red color 

 ns that 

 h temper- 

 e fruits 

 11 will 

 ephon is 

 medi um- 

 of wel 1 - 

 pite use 

 s in 



se poorly 

 e too 



The prob- 

 large 



sprouts 

 se pro- 

 hten the 

 e r i r of 



Apply the ethephon spray when good drying conditions are anti- 

 cipated for at least 6 hours after spraying. For best results, 

 thorough coverage of the fruits and leaves is needed. Good sprayer 

 calibration is essential to insure uniform coverage and to avoid 

 over-application. Apply ethephon at IX and use no spreader-sticker. 



