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ACCEL®CONCENTRATION AND TIMING ADJUSTMENTS TO EVALUATE
THINNING AND SIZE RESPONCES IN 'LIBERTY' APPLE
Increasing size and packout is an annual challenge with small fruited apple varieties such as 'Liberty'.
Proper cultural practices can only attain a grower a determinant amount of size in most years, and the
proper use of certain Plant Growth Regulators may substantially aid in a positive response of final fruit
size. Understanding how and when to apply certain compounds will be necessary for their efficient use
in orchard management practices in the future. This trial was established to evaluate interaction
scenarios that were presented from a trial conducted last year on 'Empire'.

Multiple doses of Accel
®were applied in concentrations that are not documented to produce an
effective thinning response. The main objective of these rates, and the overall trial, is to improve cell
division of the fruitlet, and therefore increase final fruit size. A thinning response was noticed, with
multiple low rates, in the trial that was conducted last year. This year the trial was expanded to evaluate
the sizing effect of multiple low rates, and the thinning effect of multiple applications and timing on
Liberty apples. Preliminary results indicate that final fruit size was directly impacted by stage of
growth timing, and less dependant on the actual concentration or number of days between applications.
J. COMPTON, W. COWGILL, G. DONATO


APOGEE (BAS-125) PGR TRIAL FOR VEGETATIVE GROWTH CONTROL
Apogee is a unique plant growth regulator that can reduce vegetative growth of pome fruits by
interfering with the production of gibberellins. Apogee is currently going through the registration
process to gain a federal label. Our trial was established in a production orchard setting, to determine

the effect multiple standard applications of Apogee
[TM]would have on vegetative growth control of a
highly vigorous, mature apple cultivar under Northeast region growing conditions
Apogee significantly reduced shoot growth when compared to the untreated control. The difference
was apparent at the 2
ndmeasurement and at each subsequent measurement thereafter. There was no
significant effect of Apogee on total yield or actual picking time per tree.
W. COWGILL, J. COMPTON, G. DONATO


1999 PROCURE®50WS FUNGICIDE COMPARISON IN APPLES
Procure 50WS is a new sterol inhibitor class fungicide that has shown to actually increase the size of
apples when compared to other chemistries of the same class. The results of a trial that was conducted
last year produced similar results to those observed in national trials. Procure 50WS actually increased
size and uniformity of packout on Empire apples when compared to other chemistries in its class. The
trial was expanded this year to evaluate Procure 50WS in conjunction with other chemistries in
different classes, but with similar modes of action, to see if it could provide the same increase in size.
Procure 50WS significantly increased total fruit yield over the untreated control and all other treatments
except for Sovran 50W. There were no statistical differences on the effect of total fruit size.
W. COWGILL, J. COMPTON, G. DONATO


1999 TYPY[TM]PGR STUDY

Compounds such as Promalin
®(GibberellinsA4A7 +6-benzyladenine) have been an industry standard
for the past 15 years to increase calyx elongation in years that do not favor the natural occurrence of
typiness, thus allowing for more uniform yields and higher packouts. The recent introduction of

another GibberellinsA
4+7 +6-benzyladenine product by Agtrol, Inc. (Typy[TM]) is being evaluated in a
randomized and replicated study, comparing it with Promalin
®, and an untreated control, for product
performance in increasing calyx elongation.
An increase in the L/D ratio (calyx elongation) was attained with the use of both GibberellinsA
4A7 +6-
benzyladenine containing compounds as compared to the Untreated Control in this trial.
W. COWGILL, J. COMPTON, G. DONATO


1999 North Jersey Tree Fruit Annual Report

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