APS_OCTOBER 2024

66 Table 2. Averages of hybrid grape and muscadine fruit quality measurements collected during two 155 seasons at the Mississippi State University Beaumont Horticultural Unit in Beaumont, 156 Mississippi. i 157 J ournal of the A merican P omological S ociety Table 2. Averages of hybrid grape and muscadine fruit quality measurements collected during two seasons at the Mississippi State University Beaumont Horticultural Unit in Beaumont, Mississippi. i

Titratable Acidity (g/L)

Avg. cluster wt. (g)

Sol. solids (%)

Avg. berry wt. (g)

Yield/vine (kg)

Cultivar

pH

2019

Blanc du Bois

16.6 b ii

NA

3.8 a

NA

72.6 b

3.4 b

Doreen

18.4 a

7.3 c

3.4 bc

7.9 a

NA iii

19.5 a

MidSouth

14.3 c

13.8 a

3.1 d

3.4 b

113.4 a

7.4 b

Miss Blanc

18.5 a

12.1 b

3.5 b

2.5 bc

79.8 b

3.7 b

OK392 (‘Mamont Noir’) (Mamont Noir)

15.8 b

13.2 ab

3.3 c

2.1 c

69.9 b

2.3 b

P- value

<.0001

<.0001

<.0001

<.0001

<.0001

<.0001

2020

Doreen

17.7 a

6.1 b

3.5 a

5.5 a

NA

15.9 a

MidSouth

16.2 b

13.8 a

2.9 c

3.4 b

117.9 a

3.6 b

Miss Blanc

16.0 b

12.7 a

3.4 a

2.9 c

78.0 b

3.3 b

OK392 (‘Mamont Noir’) (Mamont Noir)

14.9 c

13.6 a

3.2 b

2.3 d

80.7 b

2.6 b

i Vines were spaced at 2.1 m in-row and 3.7 m between rows except for the muscadine ‘Doreen’ which was 6.1 m in-row and 3.7 m between rows. ii Means within a column followed by the same letter are similar according to Tukey’s honest significant difference. iii Data not collected. <.0001 i Vines were spaced at 2.1 m in-row and 3.7 m between rows except for the muscadine ‘Doreen’ 158 which was 6.1 m in-row and 3.7 m between rows. 159 P- value <.0001 <.0001 <.0001 <.0001 .0041

Soluble solids concentration of OK392 (‘Mamont Noir’) was comparable to ‘Blanc du Bois’, a standard PD-tolerant cultivar (Mortensen 1988), in 2019, and slightly lower than ‘MidSouth’, a Missisippi-released culti var (Overcash et al. 1981; Williams and Staf

8 ne 2022) in 2020, as well as the other culti vars. Titratable acidity for OK392 (‘Mamont Noir’) was higher than desirable for winemak ing purposes, but similar to the other bunch grape cultivars. Harvesting grapes in south Mississippi is challenging due to many en-