-11 



Table 1. Suggested use of ethephon for promoting uniform ripening 

 and red color on 'Mcintosh' apple trees. 



Purpose 



Compound, timing and rate 



Fruit for sale 1st 

 or 2nd week of 

 September 



Alar* - mid-July at 1 lb/100 gals 



ethephon - 8 to 12 days prior to anticipated 

 harvest at 2/3 to 1 pt/100 gals 



plus 

 2,4,5-TP same timing as ethephon at 20 ppm 



Fruit to be picked 

 during normal har- 

 vest and held at 

 32 F in air for 

 1 month or less 



Alar* - mid-July at 1 lb/100 gals 



plus 

 ethephon - 7 to 8 days prior to anticipated 

 harvest at 1/2 to 2/3 pt/100 gals 



plus 

 NAA or 2,4,5-TP same timing as ethepon spray 

 at 20 ppmX 



Fruit to be picked 

 during normal har- 

 vest and held at 320F 

 in air as late as 

 January 1^ 



Alar* - mid-July at 1 lb/100 gals 



plus 

 ethephon - 7 to 8 days prior to anticipated 

 harvest at 1/4 pt/100 gals 



plus 

 NAA at 20 ppm or 2,4,5-TP at 10 ppm same 

 timing as ethephon spray 



Weather and tree vigor, etc. affect color development. It may be 

 best to allow 12 days, but be prepared to harvest sooner. 



y 



2,4,-5TP is preferred if 2/3 pt of ethephon is used because its pre- 

 harvest drop control capability is greater than that of NAA. 



X 



If fruit are in good condition, they will store satisfactorily in CA. 

 *Alar = Alar-85* 



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POMOLOGICAL PARAGRAPH 



Some apple growers are planning to use foliar sprays of nutraphos* 

 or calcium nitrate in June. We recommend that they switch to calcium 

 chloride in July and August in order to supply adequate calcium to 

 their apples. Please refer to page 11 of the March/April 1979 issue 

 of Fruit Notes for our recommendations on timings and rate of calcium 

 chloride applications on apple trees. 



