Block/Orchard___________________ Date_______________ DAFB_____________________
Cultivar____________________________ Age_________ Full Bloom Date________________________
% Crop Last Year_________  % Bloom ______ Rate Pollination Period_____________________________

A. Select 5 typical trees and estimates the average number of fruits per cluster. ___________________
B. Estimate the percentage (.00) of active fruiting clusters for the 5 trees. ___________________

C. Measure lateral fruit diameter for one apple per 2 clusters per tree an average.__________________
D.  Cut the 10 lateral fruits measured in C and for any with 5 or more seeds score 10,or less than 5 seeds score 0.65, and for no seeds score 0.25 (record ave.).   ___________________

E.  Rate and average overall tree vigor, 70% to 95% (.00) for the 5 sample trees. _________________

1.  Record the fruit per cluster average from A _______ and multiply (X) by the estimated percentage of overall active fruit clusters B _______ = _______ the crop potential factor.
2.  _____________ X _____________ X 100 = _____________ = _____________
Seeding Ave - D Crop Potential   divided by 50  ppm factor
3. Record the tree age factor (20 years > = 1.5; 14 to 19 years = 1.2; 10 to 13 years = .90; 
8 to 9 years = .78; 6 to 7 years = .65; and 4 to 5 years = .50)
___________ X the ppm factor ___________X tree vigor ave. E ____________ = ____________
suggested NAA (ppm mid-range rate.  This rate can be increased or reduced by 1.0 to 1.5 ppm.

30%  If spreader sticker used 25%  If Sevin used
30%  If poor pollination  30%  If light bloom (<50%)
20%  If light frost  25%  If cool temperatures, rain or cloudy before or after bloom
50%  If severe frost  30%  If high humidity/temperature before or after bloom
_____________ X __________ = ______________ subtracted from suggested rate __________
suggested rate reduction %  number      SR
Equals _____________ the final recommended NAA rate

To determine the number of days left to chemically thin, take the average fruit size recorded for C
__________and divide it by the number of Days After Full Bloom __________ = __________ the
average fruit growth rate per day.
Divide the last effective fruit size for a chemical response 14.0 mm by the fruit growth rate ________=
total days left to effectively thin __________.  Subtract from this total the number of Days After Full

Bloom the assessment was made __________ = __________ days left to effectively thin.