PHYTOPHTHORA ROOT ROT AND BOTRYOSPHAERIA STEM BLIGHT: IMPORTANT DISEASES OF SOUTHERN HIGHBUSH BLUEBERRIES IN THE SOUTHERN UNITED STATES

2006 ◽  
pp. 473-480 ◽  
Author(s):  
B.J. Smith
Keyword(s):  
United States ◽  
Root Rot ◽  
Southern United States ◽  
Phytophthora Root Rot ◽  
Stem Blight ◽  
Highbush Blueberries ◽  
Southern Highbush

scholarly journals Botryosphaeria Stem Blight on Southern Highbush Blueberry in Florida

EDIS ◽  
2019 ◽  
Vol 2019 (2) ◽  
Author(s):  
Norma C. Flor ◽  
Douglas A. Phillips ◽  
Philip F. Harmon
Keyword(s):  
United States ◽  
Plant Pathology ◽  
Vascular Disease ◽  
Abiotic Stresses ◽  
Southern United States ◽  
Highbush Blueberry ◽  
Stem Blight ◽  
Pathology Department ◽  
Advanced Stages ◽  
Southern Highbush

Botryosphaeria stem blight is the most common and damaging fungal vascular disease on southern highbush blueberry in the southern United States, causing stem and cane dieback and reductions in yield. Advanced stages of this disease may cause premature plant death, which results in significant replanting costs for growers. Biotic or abiotic stresses from a variety of sources can make plants more susceptible to infection by stem blight pathogens. This new 5-page publication is intended for Florida blueberry growers to use as a guide in the identification and management of Botryosphaeria stem blight on southern highbush blueberry. Written by Norma C. Flor, Douglas A. Phillips, and Philip F. Harmon and published by the UF/IFAS Plant Pathology Department. http://edis.ifas.ufl.edu/pp347

scholarly journals Foliar Elemental Analysis of Southern Highbush, Rabbiteye, and Highbush Blueberries in the Southern United States

1994 ◽  
Vol 4 (4) ◽  
pp. 351-355 ◽  
Author(s):  
John R. Clark ◽  
David Creech ◽  
Max E. Austin ◽  
M.E. “Butch” Ferree ◽  
Paul Lyrene ◽  
...  
Keyword(s):  
United States ◽  
Elemental Analysis ◽  
Vaccinium Corymbosum ◽  
Southern United States ◽  
Southern States ◽  
Highbush Blueberries ◽  
Southern Highbush ◽  
Species Specific ◽  
Nutritional Monitoring

Highbush (Vaccinium corymbosum L.), rabbiteye (V. ashei Reade), and southern highbush (Vaccinium spp.) blueberries grown at seven locations in six southern states were sampled in 1988 and 1989 to determine foliar elemental levels among blueberry cultivars and types. Across locations, elemental levels of N, P, K, Ca, Mg, S, Fe, Mn, Zn, Cu, and Al were similar for highbush and southern highbush types. Rabbiteye elemental levels were different from highbush and southern highbush for N, P, K, Ca, S, Mn, Cu, and Al. Rabbiteye blueberries appear to have different foliar levels, and may require species-specific standards for nutritional monitoring of plantings.

scholarly journals FOLIAR ELEMENTAL ANALYSIS OF SOUTHERN HIGHBUSH, RABBITEYE AND HIGHBUSH BLUEBERRIES IN THE SOUTHERN UNITED STATES

HortScience ◽  
1994 ◽  
Vol 29 (7) ◽  
pp. 735f-735
Author(s):  
J.R. Clark ◽  
D. Creech ◽  
M.E. Austin ◽  
M.E. Ferree ◽  
P. Lyrene ◽  
...  
Keyword(s):  
United States ◽  
Nutritional Status ◽  
Elemental Analysis ◽  
Southern United States ◽  
Foliar Analysis ◽  
Southern States ◽  
Highbush Blueberries ◽  
Southern Highbush ◽  
Species Specific ◽  
Nutritional Monitoring

Highbush (Vaccinium corvmbosum L.) rabbiteye (V. ashei Reade) and southern highbush (Vaccinium spp.) blueberries grown at seven locations in six southern states were sampled in 1988 and 1989 to determine foliar elemental levels among blueberry cultivars and types. Across locations, elemental levels of N, P, K, Ca, Mg, S, Fe, Mn, Zn, Cu and Al were similar for highbush and southern highbush types. Rabbiteye elemental levels were different from highbush and southern highbush for N, P, K, Ca, S, Mn, Cu and Al. The findings indicate that similar standard foliar levels can be used for highbush and southern highbush blueberries in determining nutritional status of plantings by foliar analysis. Rabbiteye blueberries appear to have different foliar levels, and may require species-specific standards for nutritional monitoring of plantings.

scholarly journals Populations of Phytophthora rubi Show Little Differentiation and High Rates of Migration Among States in the Western United States

2018 ◽  
Vol 31 (6) ◽  
pp. 614-622 ◽  
Author(s):  
Javier F. Tabima ◽  
Michael D. Coffey ◽  
Inga A. Zazada ◽  
Niklaus J. Grünwald
Keyword(s):  
United States ◽  
Genetic Diversity ◽  
Root Rot ◽  
Genotyping By Sequencing ◽  
The United States ◽  
Western United States ◽  
Lineage Sorting ◽  
Phytophthora Root Rot ◽  
Agricultural Ecosystems ◽  
Low Genetic Diversity

Population genetics is a powerful tool to understand patterns and evolutionary processes that are involved in plant-pathogen emergence and adaptation to agricultural ecosystems. We are interested in studying the population dynamics of Phytophthora rubi, the causal agent of Phytophthora root rot in raspberry. P. rubi is found in the western United States, where most of the fresh and processed raspberries are produced. We used genotyping-by-sequencing to characterize genetic diversity in populations of P. rubi sampled in the United States and other countries. Our results confirm that P. rubi is a monophyletic species with complete lineage sorting from its sister taxon P. fragariae. Overall, populations of P. rubi show low genetic diversity across the western United States. Demographic analyses suggest that populations of P. rubi from the western United States are the source of pathogen migration to Europe. We found no evidence for population differentiation at a global or regional (western United States) level. Finally, our results provide evidence of migration from California and Oregon into Washington. This report provides new insights into the evolution and structure of global and western United States populations of the raspberry pathogen P. rubi, indicating that human activity might be involved in moving the pathogen among regions and fields.

Races of Phytophthora sojae on Soybean in Illinois

2000 ◽  
Vol 1 (1) ◽  
pp. 32
Author(s):  
R. A. Leitz ◽  
G. L. Hartman ◽  
W. L. Pedersen ◽  
C. D. Nickell
Keyword(s):  
United States ◽  
Glycine Max ◽  
Root Rot ◽  
The United States ◽  
Phytophthora Sojae ◽  
Phytophthora Root Rot ◽  
Glycine Max L

Phytophthora root rot of soybean (Glycine max (L.) Merr.), caused by Phytophthora sojae M. J. Kauffmann & J. W. Gerdemann, has been isolated throughout the soybean-producing regions of the United States. Posted 3 June 2000.

scholarly journals Inheritance of Phytophthora Stem Blight Resistance as Compared to Phytophthora Root Rot and Phytophthora Foliar Blight Resistance in Capsicum annuum L.

2005 ◽  
Vol 130 (1) ◽  
pp. 75-78 ◽  
Author(s):  
Ousmane Sy ◽  
Paul W. Bosland ◽  
Robert Steiner
Keyword(s):  
Root Rot ◽  
Single Gene ◽  
Phytophthora Capsici ◽  
Blight Resistance ◽  
Limiting Factor ◽  
Stem Cuttings ◽  
Phytophthora Root Rot ◽  
Stem Blight ◽  
Foliar Blight ◽  
Genetic Mechanisms

The pathogen Phytophthora capsici Leon. is known to be a limiting factor of chile pepper (Capsicum L.) production around the world. The genetics of the resistance is becoming better understood due to the specific nature of the host-pathogen interaction, i.e., all plant organs are subject to infection. It has been shown that phytophthora root rot resistance and phytophthora foliar blight resistance are under different genetic mechanisms. This study aimed at understanding the inheritance of resistance of phytophthora stem blight and to determine whether phytophthora stem blight was the same disease syndrome as phytophthora root rot and phytophthora foliar blight. Stem cuttings of a segregating F2 population and testcross progeny facilitated the ability to screen for two disease syndromes concurrently. When the three disease syndromes were compared separately, the F2 populations fit a 3 resistant (R): 1 susceptible (S) ratio and the testcross progenies fit a 1R:1S ratio. When comparative studies were performed (stem vs. foliar and stem vs. root), the F2 populations fit a 9R/R:3R/S:3S/R:1S/S ratio and the testcross fit a 1R/R:1R/S:1S/R:1S/S ratio. These ratios are consistent of a single gene controlling the resistance of each system. Therefore, phytophthora stem blight, root rot, and foliar blight are three separate disease syndromes.

scholarly journals First Report of Lasiodiplodia theobromae Associated with Stem Blight of Southern Highbush Blueberries in Florida

Plant Disease ◽  
2009 ◽  
Vol 93 (9) ◽  
pp. 962-962 ◽  
Author(s):  
A. F. Wright ◽  
P. F. Harmon
Keyword(s):  
Colony Growth ◽  
Morphological Characterization ◽  
Lesion Length ◽  
Lasiodiplodia Theobromae ◽  
First Report ◽  
Stem Blight ◽  
Rdna Sequences ◽  
Agar Plug ◽  
Highbush Blueberries ◽  
Southern Highbush

Stem blight of southern highbush blueberries has been attributed to Botryosphaeria dothidea (2). Symptoms include necrotic branches with attached leaves and brown discoloration of the vasculature extending the length of the affected branch. A 2007 field survey of stem blight in Florida resulted in isolates of the previously reported B. dothidea and Neofusicoccum ribis and isolates of unreported Lasiodiplodia theobromae (2). Isolates of L. theobromae were identified to species level by morphological characterization (3). Identity was confirmed by comparison of rDNA sequences of representative isolates (GenBank Accession No. FJ882072) to reference sequences (99% similarity to Accession No. EF622074) (1). Seven, fresh, pruning wounds on southern highbush blueberries cv. Misty were inoculated with a 10-mm V8 juice agar plug of isolate MixFC-6 taken from the margin of a 3-day-old colony. Seven wounds were inoculated with a sterile agar plug. All plugs were attached to the wounds with Parafilm. Mean lesion length 14 days after inoculation was 8.6 ± 2.4 cm. The pathogen was reisolated from the margin of lesions and identified by colony growth characteristics on potato dextrose agar. No lesions were observed on control plants. To our knowledge, this is the first report that stem blight of southern highbush blueberries in Florida can be caused by L. theobromae. References: (1) A. Alves et al. Fungal Divers. 28:1, 2008. (2) F. L. Caruso and D. C. Ramsdell. Compendium of Blueberry and Cranberry Diseases. The American Phytopathological Society, St. Paul, MN, 1995. (3) P. W. Crous et al. Stud. Mycol. 55:235, 2006.

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