A mid-July application of Alar-85* on trees scheduled to re- 

 ceive ethephon is of benefit. Although Alar-85* is ineffective 

 for drop control on ethephon- treated trees, it will help maintain 

 fruit-flesh firmness. 



Successful use of ethephon. 



condi ti 

 ally ass 

 excessi v 

 tage of 

 a p p 1 i c a t 

 medi urn v 

 from whi 

 harveste 

 phon-tre 

 By the t 

 will pro 

 medi ate 



ns u 

 oci a 

 e vi 

 frui 

 ion, 

 i gor 

 ch a 

 d i n 

 ated 

 ime 

 babl 

 sale 



nfavo 

 ted w 

 gor, 

 t hav 

 The 

 or w 

 high 

 one 

 frui 

 these 

 y be 



rabl e 

 i th p 

 or de 

 ing 5 

 refor 

 ell-p 



perc 

 p i c k i 

 ts i n 



poor 

 too s 



for 

 oor f 

 nse t 

 0% or 

 e , et 

 runed 

 entag 

 ng. 



thei 

 ly CO 

 oft a 



Ethepho 

 devel opme 

 rui t col 

 rees , wi 1 

 more red 

 h e p h n is 

 , medium 

 e of wel 1 

 Large den 

 r interio 

 lored fru 

 nd thus s 



n wi 

 nt 

 r, s 

 1 ad 

 col 

 mos 

 size 

 -col 

 set 

 r wi 

 its 

 ui ta 



11 no 

 f red 

 uch a 

 verse 

 or fo 

 t use 

 d tre 

 ored 

 rees 

 th in 

 obtai 

 bl e 



t comple 



col or. 

 s high t 

 ly affec 

 1 1 owi ng 

 ful on y 

 es of mo 

 fruits a 

 will hav 

 adequate 

 n adequa 

 nly for 



tely 



Fact 

 emper 

 t the 

 an et 

 oung 

 derat 

 re no 

 e man 



red 

 te CO 

 j ui ce 



overcome 

 ors norm- 

 atures , 



percen- 

 hephon 

 trees of 

 e vigor 

 rmal ly 

 y ethe- 

 color. 

 lor they 



or i m - 



Ethephon should not be applied earlier than 3 weeks prior to 

 normal anticipated harvest because fruit quality could be reduced. 

 Apply the ethephon-stop-drop spray combination when good drying 

 conditions are anticipated for at least 12 hours after spraying. 

 For best results, thorough coverage of the fruits and leaves is 

 needed. 



Good sprayer calibration is essential to insure uniform cover- 

 age and to avoid over-application. Apply ethephon at IX and use 

 no spreader-sticker. 



Basically, there are 3 time periods for sale of ethephon- 

 treated frui ts--pri or to normal harvest time, during normal har- 

 vest, and from storage until January 1. The volume of fruits sprayed 

 with ethephon should be based upon anticipated sales during one or 

 more of these sale periods. The harvest of ethephon-treated fruits 

 must not interfere with the timely harvest of fruits for CA storage 

 since at present the placement of ethephon-treated fruits in this 

 type of storage is not recommended. Limited data show that ethe- 

 phon-treated fruit which still are in good condition will store 

 satisfactorily in CA but we are concerned that apples not in good 

 condition will be stored. 



Fruit to be placed in storage at 32 

 maturity. Fruits to be sold through January 1 

 more than 1/4 pint of ethephon per 100 gallons 

 1) and be harvested 7-10 days after treatment, 

 fruits should store well until January 1, they 

 Alar-treated fruits. 



F must be picked at proper 

 should receive no 

 of water (See Table 



Although these 

 will be softer than 



Suggestions for use. In the table below are our suggestions for 

 ethephon use. Ethephon should prove beneficial particularly for 

 early season sales if used properly. Don't over-apply and use only 

 on a trial basis since we need more experience with this compound 

 under commercial usage . ~ 



