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Table 2 Severity of scab on pecan leaves by provenance in 2018 and 2019 at Byron, GA, USA

From: Foliage and fruit susceptibility of a pecan provenance collection to scab, caused by Venturia effusa

Provenance

Most scabbed

Overall

2018

2019

2018

2019

% severitya (rank)

95% CI

% severity (rank)

95% CI

% severity (rank)

95% CI

% severity (rank)

95% CI

IL-J

0.12 Fb (18)c

0.07–0.19

0.1 E (19)

0.07–0.15

0.11 C (16)

0.09–0.14

0.1 F (19)

0.09–0.12

KS-C

0.21 CDEF (10)

0.12–0.38

0.14 DE (9)

0.09–0.23

0.14 BC (9)

0.1–0.19

0.12 DEF (10)

0.1–0.14

KS-K

0.14 DEF (13)

0.08–0.25

0.11 E (14)

0.07–0.17

0.12 BC (14)

0.09–0.16

0.11 EF (14)

0.09–0.13

KY-W

0.13 DEF (15)

0.07–0.24

0.11 E (15)

0.07–0.17

0.12 BC (15)

0.09–0.16

0.11 EF (16)

0.09–0.13

MO-L

0.12 EF (17)

0.07–0.22

0.11 E (12)

0.07–0.18

0.11 BC (19)

0.08–0.15

0.11 DEF (11)

0.09–0.14

MO-V

0.13 EF (16)

0.07–0.22

0.11 E (13)

0.07–0.17

0.11 BC (18)

0.08–0.15

0.11 EF (13)

0.09–0.13

MS-W

0.17 DEF (11)

0.09–0.34

0.11 E (16)

0.06–0.18

0.12 BC (13)

0.09–0.17

0.11 EF (15)

0.09–0.13

MX-C

0.98 ABC (5)

0.52–1.86

0.42 BCD (7)

0.25–0.69

0.24 AB (5)

0.17–0.34

0.17 BCDE (6)

0.14–0.2

MX-I

0.49 CDE (7)

0.29–0.81

0.46 BC (6)

0.31–0.7

0.19 BC (7)

0.14–0.24

0.17 BCD (5)

0.15–0.2

MX-J

0.16 DEF (12)

0.1–0.27

0.12 E (11)

0.08–0.18

0.12 BC (11)

0.1–0.16

0.11 EF (12)

0.1–0.13

MX-O

0.68 BCD (6)

0.35–1.33

0.25 CDE (8)

0.15–0.42

0.21 ABC (6)

0.15–0.29

0.15 CDEF (8)

0.12–0.18

MX-S

0.22 CDEF (9)

0.11–0.45

0.53 ABC (5)

0.32–0.88

0.13 BC (10)

0.09–0.18

0.16 BCDEF (7)

0.13–0.2

TN-L

0.11 F (19)

0.07–0.2

0.1 E (17)

0.07–0.16

0.11 BC (17)

0.08–0.15

0.1 EF (18)

0.09–0.12

TX-B

0.14 EF (14)

0.08–0.23

0.1 E (18)

0.07–0.16

0.12 BC (12)

0.09–0.16

0.1 F (17)

0.09–0.12

TX-G

0.28 CDEF (8)

0.16–0.47

0.14 DE (10)

0.09–0.21

0.15 BC (8)

0.11–0.2

0.12 DEF (9)

0.1–0.14

TX-K

2.77 AB (2)

1.66–4.61

1.38 A (3)

0.92–2.07

0.41 A (2)

0.32–0.54

0.22 ABC (3)

0.19–0.26

TX-T

4.09 A (1)

2.47–6.77

1.4 A (2)

0.94–2.1

0.41 A (3)

0.31–0.53

0.25 AB (2)

0.21–0.29

TX-V

2.71 AB (3)

1.59–4.61

1.63 A (1)

1.07–2.48

0.42 A (1)

0.32–0.55

0.32 A (1)

0.27–0.37

TX-Z

2.13 AB (4)

1.25–3.62

0.86 AB (4)

0.57–1.3

0.4 A (4)

0.31–0.53

0.21 BC (4)

0.18–0.24

F value (P)

21.8 (< 0.0001)

 

23.3 (< 0.0001)

 

13.7 (< 0.0001)

 

18.3 (< 0.0001)

 
  1. In both years two scab severity estimates were taken, (1) a visual assessment of the most severely scabbed leaf, and (2) an overall assessment of the severity on leaves in the tree canopy. Estimates were based on a quantitative ordinal scale taking interval mid-points prior to analysis (Chiang et al. 2014)
  2. aThe % area diseased estimates were natural log transformed. Back transformed values are presented with means separation based on transformed values. The 95% CIs are back transformed values such that the upper confidence limit is EXP(LNmean + LNupperCI), and the lower confidence limit is EXP(LNmean − LNlower)
  3. bMeans separation was based on the Tukey-Kramer method (α = 0.05)
  4. cRank is the ranking order of magnitude from highest severity to lowest severity
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CABI Agriculture and Bioscience

ISSN: 2662-4044