Journal APS Oct 2017

J ournal of the A merican P omological S ociety

252

LSD P ≤  0.05. Data were analyzed using the JMP statistical software package (Version 11; SAS Institute Inc., Cary, North Carolina). Results  Yield, fruit number, and survival. ‘Con- corde’ produced significantly higher yields and more number of fruits than ‘Taylor’s Gold Comice’ (Fig. 1). Similar yields and number of fruits were observed for both OHF root- stocks, whereas Pyrodwarf had lower values than OHF97 (Fig. 1). No significant differ- ences regarding tree survival were observed within cultivars and rootstocks (Table 1). Figure 1 224

 Tree vigor and fruit size. At Geneva, ‘Tay- lor’s Gold Comice’ trees were significantly larger than ‘Concorde’ after 12 years of growth, with OHF87 and OHF97 producing larger trees than Pyrodwarf for both cultivars (Table 2). There was a significant interaction between rootstock and scion at Rockland. Larger trees were ‘Taylor’s Gold Comice’ on OHF rootstocks, whereas the smallest ones were ‘Taylor’s Gold Comice’ on Pyrodwarf and ‘Concorde’ on OHF87 and Pyrodwarf (Table 2).  Regarding fruit size, there was a signifi- cant cultivar x rootstock interaction at Gene-

0 100 200 300 400 500 600 700 800

*

200

160

*

120

80

Fruit #

Yield (kg/tree)

40

0

Taylor's Gold Comice

Concorde

600

a

200

ab

500

b

160

400

120

a

ab

300

b

80

Fruit #

200

Yield (kg/tree)

40

100

0

0

OHF87

OHF97

Pyrodwarf

225 226 Fruit # Fig. 1. Cumulative yield (kg) and fruit number per tree (2004-2015) for ‘Concorde’ and ‘Taylor's Gold Comice’, and for OHF87, OHF97, and Pyrodwarf rootstocks. Different letters indicate significant differences at P = 0.05 using LSD. Yield