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Table 2 Analysis of variance of lesion area and sporulation for detached leaf inoculation of twelve Phytophthora species

From: Growth, infection and aggressiveness of Phytophthora pathogens on Rhododendron leaves

Experiment; effect

Source

DF

F

P

Experiment 1; % lesion area†

Species

11

121.99

 < 0.001

Cultivar

1

7.97

0.005

Species*Cultivar

11

8.11

 < 0.001

Block

4

0.50

0.733

Experiment 1; % lesion area on Rhododendron cv. CB

Species

11

30.46

 < 0.001

Block

4

0.69

0.606

Experiment 1; % lesion area on Rhododendron cv. LDP

Species

11

8.54

 < 0.001

Block

4

0.75

0.566

Experiment 1; sporulation/mm2 †

Species

11

23.67

 < 0.001

Cultivar

1

1.07

0.303

Species*Cultivar

11

1.10

0.373

Block

4

0.17

0.953

Experiment 1; sporulation/mm2 † on Rhododendron cv. CB

Species

11

10.60

 < 0.001

Block

4

0.46

0.766

Experiment 1; sporulation/mm2 † on Rhododendron cv. LDP

Species

11

14.05

 < 0.001

Block

4

0.55

0.701

Experiment 2; % lesion area†

Species

11

163.69

 < 0.001

Cultivar

1

70.48

 < 0.001

Species*Cultivar

11

8.20

 < 0.001

Block

4

0.05

0.996

Experiment 2; % lesion area on Rhododendron cv. CB

Species

11

76.55

 < 0.001

Block

4

0.43

0.785

Experiment 2; % lesion area on Rhododendron cv. LDP

Species

11

23.76

 < 0.001

Block

4

0.57

0.686

Experiment 2; sporulation/mm2 †

Species

11

38.47

 < 0.001

Cultivar

1

4.94

0.029

Species*Cultivar

11

1.90

0.050

Block

4

3.36

0.013

Experiment 2; sporulation/mm2 † on Rhododendron cv. CB

Species

11

27.17

 < 0.001

Block

4

1.39

0.253

Experiment 2; sporulation/mm2 † on Rhododendron cv. LDP

Species

11

20.04

 < 0.001

Block

4

3.82

0.009

  1. CB = Rhododendron cv. catawbiense ‘Boursault’; LDP = Rhododendron cv. ‘Lee’s dark purple’. Bold P values are significant at < 0.05
  2. †Data were square root transformed for analysis of variance
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CABI Agriculture and Bioscience

ISSN: 2662-4044