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Table 1 from:


Shishkoff, N. 2007. Susceptibility of some Lilac cultivars and other members of the Oleaceae to Phytophthora ramorum. Online. Plant Health Progress doi:10.1094/PHP-2007-1101-02-RS.


Table 1. Responses of lilacs and other plants in the Oleaceae to infection by Phytophthora ramorum.

Group Plants # plants inoc.u % inf. plsv % defol-iation % symptomatic leavesw % disease area / diseased leavesx % disease area / total leavesy % infect. budsz
Syringa 'Alexander's Pink' 11 25.0 1.4 0.6 ghij 9.2 cde 0.04 cde 0.0
'Betsy Ross' 11 100 3.7 37.1 abcdef 17.9 abc 8.0 abc 0.0
'Blanche Sweet' 7 100 2.3 52.2 abcdef 33.8 abc 21.1 abc 14.3
'James Macfarlane' 9 0.0 0.0 0.0 -- 0.0 -- 0.00 -- 0.0
'Lark Song' 8 100 5.0 41.8 abcdef 11.5 abcd 5.8 abc 0.0
'Lilac Sunday' 14 100 6.4 44.8 abcdef 36.2 abc 16.2 abc 6.6
S. pubescens subsp. Patula 'Miss Kim' 4 100 3.8 23.5 abcdefgh 6.6 abcde 1.7 abcde 0.0
S. meyeri 'Palibin' 4 100 9.4 45.8 abcdef 18.9 abc 9.6 abc 0.0
'Royalty' 8 100 0.3 25.3 abcdefg 12.8 abc 3.4 abc 22.4
S. pekinensis 'Summer Charm' 7 100 6.9 29.0 abcdefg 22.8 abc 8.0 abc 3.1
S. oblata 8 100 1.9 34.0 abcdef 22.5 abc 8.8 abc 8.7
S. x laciniata 9 100 3.8 35.0 abcdef 35.6 abc 11.5 abc 0.0
S. vulgaris 38 100 3.8 57.2 abc e 17.0 abc 10.6 abc 0.0
S. vulgaris (seedling) 18 88.9 0.0 31.1 bcdef 33.4 abc 14.6 abc 0.0
Oleaceae Abeliophyllum distichum 8 100 3.1 18.5 bcdefgh 16.9 abc 3.3 abcd 0.0
Forsythia x intermedia 29 62.1 0.2 17.1 c efghi 6.4 bcde 1.1 bcde 0.0
Fraxinus americana 8 50.0 0.5 6.4 efghij 6.8 -- 1.2 cde 5.4
Ligustrum vulgaret 12 58.3 0.3 2.6 ghij 11.1 -- 0.3 cde 1.4
Other Rhododendron 'Cunningham's White' 55 100 0.0 54.9 abc e 14.3 abc 8.4 abc 0.0

 s For the taxonomy of lilacs, I have followed Vrugtman (16). 'Alexander's Pink' in the villosae group is a hybrid of S. x josiflexa 'James Macfarlane' x S. x prestoniae 'Ethel M. Webster'; 'Betsy Ross' is a cross of S. oblata with an unknown; 'Blanche Sweet' is a cross of 'Rochester' x S. oblata subsp. dilatata; 'James Macfarlane' is a cross of S. x josiflexa 'Royalty' with an unknown; 'Lark Song' is a cross of (S. sweginzowii x S. tomentella) x S. komarowii; 'Lilac Sunday' and 'Royalty' have unknown parentage; "Summer Charm" ('DTR 124') is not an officially registered cultivar; S. x laciniata is a hybrid between S. protolaciniata and an unknown.

 t ITS and ETS analysis by Li, Alexander, and Zhang (7) has shown that Ligustrum should actually be placed in Syringa.

 u "# pls inoc." = the number of plants inoculated.

 v "% inf. pls." = percentage of infected plants out of total inoculated.

 w "% symptomatic lvs" was the number of leaves showing visible symptoms after inoculation divided by total leaves on the plant at time of inoculation. This included symptomatic leaves that had dropped. Treatments followed by the same letter did not differ significantly at the 0.05 level. Treatments followed by no letters came from plants with little disease which were excluded from data sets. Remaining data was log-transformed and analyzed by General Linear Models with Tukey's Studentized Range test using SAS.

 x "% dis. area/dis. lvs" was derived by adding the percentage lesion size for each diseased leaf and then dividing by the number of diseased leaves total. Treatments followed by the same letter did not differ significantly at the 0.05 level. Treatments followed by no letters came from plants with little disease which were excluded from data sets. Remaining data was log-transformed and analyzed by General Linear Models with Tukey's Studentized Range test using SAS.

 y "% dis. area/ tot. lvs" was the percent diseased tissue averaged over all leaves. Treatments followed by the same letter did not differ significantly at the 0.05 level. Treatments followed by no letters came from plants with little disease which were excluded from data sets. Remaining data was log-transformed and analyzed by General Linear Models with Tukey's Studentized Range test using SAS.

 z "% dis. buds"= percentage of diseased buds.



Table 2. Root infection of plants inoculated with P. ramorum.

Group Plant species # pls inoc.x % plants infectedy % washed roots infectedy % surface-sterilized roots infectedy
Syringa S. vulgaris 25 64.0 11.8 6.6
S. x josiflexa
'James MacFarlane'
8 25.0 0.3 0.2
S. x prestoniae 'Alexander's pink' 6 33.3 13.8 6.0
Oleaceae Abeliophyllum distichum 7 71.4 0.4 1.6
Forsythia x intermedia 5 80.0 2.3 0.7
Ligustrum vulgare 4 0.0 0.0 0.0
Known foliar hosts Viburnum davidii 9 66.7 8.2 3.7
V. tinus 10 70.0 18.0 3.5

 x "# pls inoc."= number of plants inoculated.

 y Plants were inoculated by drenching roots with a sporangial suspension (approx. 3000 sporangia/mL) and incubating for a month, then plating roots that had been washed or surface sterilized onto PARPH media. "Percent plants infected" was the proportion of plants inoculated that showed any root infection. "Percent washed roots infected" was the proportion of washed roots that developed colonies of P. ramorum after plating; "percent surface sterilized roots infected" was the proportion of roots that were placed in 0.025% sodium hypochlorite for 5 to 10 min (depending on root diameter) and rinsed before being plated on PARPH which showed colonization (presumably internal colonization only) by P. ramorum.




2007 Plant Management Network.