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Table 2 Total number of trees and number of flowering trees and flower clusters, the annual mean fire blight infection score of the progeny and parents of an ‘Idared’ × Malus ×robusta 5 (Mr5) population inoculated with Erwinia amylovora strain Ea222_JKI in the period 2011–2017 in Germany. For the progeny, the percentage of progeny rated Class 0 (i.e. no infection) is presented for each year

From: Mapping of fire blight resistance in Malus ×robusta 5 flowers following artificial inoculation

Yeara

Progeny

Parents

  

# flower clusters inoculated

Mean scoreb

 

‘Idared’

Mr5c

#

# trees flowering

% Class 0

# trees

# flower clusters inoculated

Mean scoreb

# trees

# flower clusters inoculated

Mean scoreb

Total

Mapping population

 

2011

239

188

91

1573

1.86a

34.0

0

  

1

3

0

2012

233

228

111

3367

0.95c

35.1

0

  

1

20

0

2013

173

154

65

2722

0.47e

37.0

0

  

1

35

0

2015

150

148

126

2546

0.75d

29.1

10

112

2.01c

5

58

0.28a

2016

150

59

46

325

1.11bc

61.0

9

69

3.71a

8

69

0.10ab

2017

150

146

125

1982

1.37b

26.0

10

100

2.81b

9

112

0.08b

  1. aProgenies from trial 2011–2013 were grafted on ‘M9’ and progenies from trial 2015–2017 were grafted on ‘B9’
  2. bDifferent letters indicate significantly different means at α = 0.05
  3. cData from 2011 to 2013 were not included in analysis