scholarly journals BREEDING FOR RESISTANCE TO PLUM LEAF SCALD

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 431c-431
Author(s):  
J.D. Norton ◽  
G.E. Boyhan ◽  
B. Tangsukkasemsan
Keyword(s):  
Phase Contrast ◽  
Xylella Fastidiosa ◽  
Visual Observation ◽  
Causal Agent ◽  
Breeding Program ◽  
Leaf Scald ◽  
Breeding For Resistance ◽  
Recessive Genes

Plum leaf scald (PLS) caused by the organism Xylella fastidiosa is one of the most serious diseases of plum. After X. fastidiosa was identified as the causal agent for PLS, a feral source (Starcher no. 1) was used extensively in the breeding program. Microscopic (phase contrast) examinations of vacuum extracts and petiole squashes and later ELISA were used to determine PLS infection and later were correlated with a rating index for PLS and tree longevity. Cultivars, species, and their progeny, including Prunus americana, P. angustifolia, P. cerasifera, P. munsoniana, P. salicina, P. simoni, P. bullata, and P. triflora were evaluated. Observations indicate that resistance is heritable and controlled by recessive genes. ELISA and visual observation indicated that an Auburn Univ. seedling (CD 122) was free from this disease.

scholarly journals THE OCCURRENCE OF PLUM LEAF SCALD ON PLUM CULTIVARS IN ALABAMA

HortScience ◽  
1995 ◽  
Vol 30 (3) ◽  
pp. 437d-437
Author(s):  
B. Tangsukkasemsan ◽  
J.D. Norton ◽  
G.E. Boyhan
Keyword(s):  
Xylella Fastidiosa ◽  
Visual Observation ◽  
Causal Agent ◽  
High Tolerance ◽  
Leaf Scald ◽  
Variety Trials ◽  
L 22

Naturally infected plum leaves were collected during Aug. and Sept. 1994 to evaluated for the presence of Xylella fastidiosa, the causal agent of plum leaf scald (PLS). Leaves were from trees at least 4 years old in variety trials at four locations in Alabama. ELISA tests for X. fastidiosa were used to determine the presence of the organism in infected trees. The symptoms also were evaluated with a rating index for PLS. Some plum cultivars (i.e., `AU-Producer', `Morris', `Explorer', and `AU-Cherry') showed high tolerance to PLS. Both ELISA tests and visual observation indicated that an Auburn Univ. seedling (CD-l 22) was free from this disease. PLS infection was lower in North Alabama compared to Central Alabama.

Radicinin from Cochliobolus sp. inhibits Xylella fastidiosa , the causal agent of Pierce’s Disease of grapevine

2015 ◽  
Vol 116 ◽  
pp. 130-137 ◽  
Author(s):  
Thomas J. Aldrich ◽  
Philippe E. Rolshausen ◽  
M. Caroline Roper ◽  
Jordan M. Reader ◽  
Matthew J. Steinhaus ◽  
...  
Keyword(s):  
Xylella Fastidiosa ◽  
Causal Agent ◽  
Pierce's Disease ◽  
Pierce’S Disease

scholarly journals SCS 438 Zafira - a new plum cultivar resistant to leaf scald (Xylella fastidiosa)

2018 ◽  
Vol 18 (2) ◽  
pp. 229-233 ◽  
Author(s):  
Marco Antonio Dalbó ◽  
Emilio Dela Bruna ◽  
André Luiz Kulkamp de Souza
Keyword(s):  
Xylella Fastidiosa ◽  
Leaf Scald

Plum selections with total resistance to leaf scald (Xylella fastidiosa)

2016 ◽  
pp. 61-64 ◽  
Author(s):  
M.A. Dalbó ◽  
E.D. Bruna ◽  
R.O. Nodari ◽  
L. Saifert
Keyword(s):  
Xylella Fastidiosa ◽  
Total Resistance ◽  
Leaf Scald

Seven years of negative detection results confirm that Xylella fastidiosa, the causal agent of CVC, is not transmitted from seeds to seedlings

2014 ◽  
Vol 139 (3) ◽  
pp. 593-596 ◽  
Author(s):  
Helvécio Della Coletta-Filho ◽  
Sérgio Alves Carvalho ◽  
Luis Fernando Carvalho Silva ◽  
Marcos Antonio Machado
Keyword(s):  
Xylella Fastidiosa ◽  
Causal Agent ◽  
Negative Detection

scholarly journals 037 EVALUATION OF XYLELLA FASTIDIOSA IN PRUNUS SPP.

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 433b-433
Author(s):  
J.D Norton ◽  
B.R. Abrahams ◽  
G. E. Boyhan ◽  
Hongwen Huang
Keyword(s):  
Xylella Fastidiosa ◽  
Recessive Genes ◽  
Prunus Spp

Forty eight cultivars, species, and their progeny including Prunus americana P. angustifolia, P. cerasifera P. munsoniona, P. salicina, P. simoni, and P. triflora were evaluated for resistance to Xylella fastidiosa based on percent of scalded leaves and tree longevity. Observations indicate that resistance is heritable and controlled by recessive genes. Further, X. fastidiosa transmission was evaluated in plum and peach by chip and slip budding. Transmission as measured by enzyme-linked immunoabsorbant assay indicated that chip budding resulted in a higher level of transmission over slip budding in plum but not in peach. Neither Lovell nor Nemaguard rootstock had an effect on transmission.

scholarly journals Imidacloprid Insecticide Slows Development of Phony Peach and Plum Leaf Scald

2005 ◽  
Vol 15 (3) ◽  
pp. 642-645 ◽  
Author(s):  
James D. Dutcher ◽  
Gerard W. Krewer ◽  
Benjamin G. Mullinix
Keyword(s):  
Field Experiments ◽  
Prunus Persica ◽  
Xylella Fastidiosa ◽  
Early Spring ◽  
Leaf Scald ◽  
Japanese Plum ◽  
Soil Drench ◽  
Plum Varieties ◽  
Peach Trees

Observations in controlled field experiments over 5 years indicated that imidacloprid, applied as a soil drench around the trunks of peach (Prunus persica), nectarine (P. persica var. nectarine) and japanese plum (P. salicinia) trees at planting and in the early spring and mid-summer for two subsequent seasons (0.7 g/tree a.i.), slowed the development of symptoms of phony peach disease (PPD) and plum leaf scald (PLS) (Xylella fastidiosa) in the trees. After 3.5 years, the percentage of peach trees showing PPD symptoms was 8.5% for the imidacloprid-treated trees compared to 34.3% for untreated trees. After 4.5 years, the percentage of peach trees showing PPD symptoms was 13.1% in the treated trees and 71.4% in the untreated trees. After 3.5 years, nectarine trees in untreated and treated plots showed PPD symptoms in 8.3% and 0.9% of the trees, respectively. After 4.5 years, PPD symptoms in nectarine were found in 32.3% of the untreated trees and 8.5% of the treated trees. Development of PLS disease in plum was also slowed by the trunk drench with imidacloprid in two japanese plum varieties. After 3.5 years, dieback was observed in 55% of the twigs of untreated and 23% of the twigs of treated trees of `Au Rosa' plum and 33% of the twigs of untreated and 12% of the twigs of treated trees of `Santa Rosa' plum.

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