Q. 

 O 



Q 

 LU 



> 



o 



100 



80 



60 



40 



20 







CONTROL 

 WASHOFF NONE 

 WASHOFF 1 HR 

 WASHOFF 4 HR 

 WASHOFF 8HR 



2 4 6 8 10 



WEEKS AFTER AVG APPLICATION 



Figure 1 . Effects of AVG and the and simulation of ram on AVG-treated trees on cumulative drop of Marshall 

 Mclntosli/Mark apples. 1992. 



developed by Priest and Lougheed. Tliree additional 

 harvests were made and fruit were similarly evaluated at 

 weekly intervals on September 24, October 1, and October 

 8. All fruit were picked up under each tree designated as a 

 drop tree on September 1 and then twice weekly until 

 November 9. On each drop-pick-up day the number of fruit 

 picked up under each tiee was recorded. On November 9, all 

 fruit remaining on the drop trees were harvested and 

 counted. Cumulative drop per tree was then calculated. 



2000 Study. A block of mature Marshall Mcintosh/ 

 M.26 was selected at the University of Massachusetts, 

 Horticultural Research Center, Belchertown, MA. Sixty 

 trees were selected and blocked into six groups 

 (replications) of 12 trees each based upon crop load and 

 proximity. On August 17, ten of the twelve trees in each 

 replication were sprayed with 50 g a. i. /acre ReTain 

 containing 0. 1 % Silwet in 1 00 gallons per acre using a rear- 

 mounted airblast sprayer. TRV assessment suggested that 

 these trees would require 140 gallons per acre for a dilute 

 application. One hour after ReTain application, two trees in 

 each block that had received ReTain were washed with 1 to 

 12 gal of water for 3 to 4 minutes using an hydraulic sprayer 



with a hand gun attached. Particular effort was made to 

 direct the wash water on the fruit and spur leaves. Pairs of 

 ReTain-treated trees were similarly washed at 3 hours and 8 

 hours after application. Two trees in each block did not 

 receive ReTain and served as the untreated control trees. On 

 September 7, twenty fruit were harvested randomly from the 

 periphery of each of the 30 trees designated as the sample 

 trees. Fruit were weighed, and then the percent of the fruit 

 surface that was red was estimated visually to the nearest 

 10%. Further, the red color was judged to determine if it was 

 intense enough to meet US Extra Fancy standards. A 

 representative 10-apple subsample was taken and flesh 

 fiminess and soluble solids determined as described in the 

 1992 investigation. Fruit were then cut in half, dipped in 

 starch iodine solution, and maturity then estimated using the 

 generic starch chart developed at Cornell University. Three 

 additional harvests were made, and fruit were evaluated 

 similarly at weekly intervals on September 14, September 

 21, and September 28. All dropped fruit were picked up 

 under each tree designated as a drop tree on September 1 and 

 then twice weekly until October 1 6. On each drop pick-up 

 day the fruit picked up under each tree were recorded. On 



58 



Fruit Notes, Volume 65, 2000 



