The effect of chemical and biological treatment on root and crown rot disease caused by Phytophthora cryptogea Pethybr. & Lafferty in Gerbera

2019 ◽  
Vol 167 (4) ◽  
pp. 240-247
Author(s):  
Çiğdem Özkan Kahraman ◽  
Figen Yıldız
Keyword(s):  
Biological Treatment ◽  
Crown Rot ◽  
Phytophthora Cryptogea ◽  
Root And Crown Rot ◽  
Rot Disease

‘Cylindrocarpon ’ and Ilyonectria Species Causing Root and Crown Rot Disease of Potted Laurustinus Plants in Italy

2014 ◽  
Vol 163 (7-8) ◽  
pp. 675-680 ◽  
Author(s):  
Dalia Aiello ◽  
Vladimiro Guarnaccia ◽  
Filomena Epifani ◽  
Giancarlo Perrone ◽  
Giancarlo Polizzi
Keyword(s):  
Crown Rot ◽  
Root And Crown Rot ◽  
Rot Disease

scholarly journals Incidence of Root and Crown Rot Disease of Black cumin in the Southwest of Iran

2019 ◽  
Vol 8 (2) ◽  
pp. 1-8
Author(s):  
Fariba Ghaderi ◽  
Keyword(s):  
Crown Rot ◽  
Black Cumin ◽  
Root And Crown Rot ◽  
Rot Disease ◽  
Southwest Of Iran

scholarly journals A New Root and Crown Rot Disease of Heath in California Caused by Cylindrocladium pauciramosum

Plant Disease ◽  
1999 ◽  
Vol 83 (6) ◽  
pp. 589-589 ◽  
Author(s):  
S. T. Koike ◽  
D. M. Henderson ◽  
P. W. Crous ◽  
C. L. Schoch ◽  
S. A. Tjosvold
Keyword(s):  
North America ◽  
Species Complex ◽  
Ground Cover ◽  
First Record ◽  
Crown Rot ◽  
Conidial Suspension ◽  
Similar Disease ◽  
Crown Tissue ◽  
Root And Crown Rot ◽  
Rot Disease

Heath (Erica capensis Salter) is a woody, evergreen plant used in Cali-fornia as a landscape shrub or ground cover. In 1997, a new root and crown disease was found in commercial nursery plantings of potted heath. A similar disease was found in 1998 on heath transplants being grown as liners. In both situations, roots were necrotic and crown tissue turned brown. Affected plants became gray-green in color, withered, and died. A Cylindrocladium species was consistently isolated from roots, crowns, and lower stems of symptomatic plants. Isolates were characterized by having penicillate conidiophores terminating in obpyriform to broadly ellipsoidal vesicles. Conidia were hyaline, 1-septate, straight with rounded ends, (30-) 45 to 55 (-60) × (3.5-) 4 to 5 μm, placing it in the Cylindrocladium candelabrum Viégas species complex. Ten single-conidial isolates produced perithecia with viable progeny of Calonectria pauciramosa C.L. Schoch & Crous when mated on carnation leaf agar with tester strains of Cylindrocladium pauciramosum C.L. Schoch & Crous (1). Matings with tester strains of all other species in this complex proved unsuccessful. Pathogenicity of 8 representative isolates was confirmed by applying 3 ml of a conidial suspension (3.0 × 105 conidia per ml) to the crowns of potted, 6-month-old, rooted heath cuttings that were subsequently maintained in a greenhouse (23 to 25°C). After 2 weeks, plant crowns and roots developed symptoms similar to those observed in the field, and plants later wilted and died. C. pauciramosum was reiso-lated from all plants. Control plants, which were treated with water, did not develop any symptoms. The tests were repeated and the results were similar. This is the first report of C. pauciramosum as a pathogen of heath, and the first record of this pathogen from North America. Reference: (1) C. L. Schoch et al. Mycologia 91:286, 1999.

scholarly journals First Report of a Root and Crown Rot Disease of Myrtle in California Caused by Cylindrocladium pauciramosum

Plant Disease ◽  
2001 ◽  
Vol 85 (4) ◽  
pp. 448-448 ◽  
Author(s):  
S. T. Koike ◽  
P. W. Crous
Keyword(s):  
Species Complex ◽  
The United States ◽  
Crown Rot ◽  
Conidial Suspension ◽  
First Report ◽  
Potted Plants ◽  
Crown Tissue ◽  
Root And Crown Rot ◽  
Plant Pathol ◽  
Rot Disease

Myrtle (Myrtus communis) is a woody, evergreen plant used in California as a landscape shrub or potted plant. In 2000, a new root and crown disease was found in commercial nursery myrtle being grown as potted plants. Roots were necrotic and crown tissue was brown. Affected plants became gray-green in color, withered, and died. A Cylindrocladium sp. was consistently isolated from roots, crowns, and lower stems of symptomatic plants. Isolates were characterized by having penicillate conidiophores terminating in obpyriform to broadly ellipsoidal vesicles. Conidia were hyaline, 1-septate, straight with rounded ends, (50-) 53 to 56 (-58) × (3.5-) 4 to 6 μm, placing it in the Cylindrocladium candelabrum Viégas species complex. Single-conidial isolates (STE-U 4012 to 4018) produced perithecia with viable progeny of Calonectria pauciramosa C.L. Schoch & Crous when mated on carnation leaf agar with tester strains of Cylindrocladium pauciramosum C.L. Schoch & Crous (2). Matings with tester strains of all other species in this complex proved unsuccessful. Only one mating type of C. pauciramosum has thus far been found in the United States. Pathogenicity of representative isolates was confirmed by applying 5 ml of a conidial suspension (1.0 × 106 conidia/ml) to the crowns of potted, 5-month-old, rooted mytle cuttings that were subsequently maintained in a greenhouse (23 to 25°C). After 4 weeks, plant crowns and roots developed symptoms similar to those observed in the nursery, and plants later wilted and died. C. pauciramosum was re-isolated from all plants. Control plants, which were treated with water, did not develop any symptoms. The tests were repeated and the results were similar. This is the first report of C. pauciramosum as a pathogen of myrtle in California. The disease has been reported on myrtle in Europe (1). References: (1) G. Polizzi and P. W. Crous. Eur. J. Plant Pathol. 105:407, 1999. (2) C. L. Schoch et al. Mycologia 91:286, 1999.

scholarly journals RESISTANCE SOURCES OF WHEAT GENOTYPES FOR ROOT AND CROWN ROT DISEASE CAUSAL ORGANISM Fusarium culmorum (W.G. SMITH)

2019 ◽  
pp. 99-103
Author(s):  
Gul Imriz ◽  
Fatih Ozdemir ◽  
Murat Nadi Tas ◽  
Birol Ercan ◽  
lker Topa ◽  
...  
Keyword(s):  
Fusarium Culmorum ◽  
Crown Rot ◽  
Causal Organism ◽  
Wheat Genotypes ◽  
Resistance Sources ◽  
Root And Crown Rot ◽  
Rot Disease

scholarly journals Phytophthora Root and Crown Rot of Sage Caused by Phytophthora cryptogea in California

Plant Disease ◽  
1997 ◽  
Vol 81 (8) ◽  
pp. 959-959 ◽  
Author(s):  
S. T. Koike ◽  
D. M. Henderson ◽  
J. D. MacDonald ◽  
M. S. Ali-Shtayeh
Keyword(s):  
Root Zone ◽  
Salvia Officinalis ◽  
Crown Rot ◽  
American Phytopathological Society ◽  
Phytophthora Cryptogea ◽  
First Report ◽  
Salinas Valley ◽  
Root And Crown Rot ◽  
Cardinal Temperatures ◽  
Zoospore Suspension

In 1996, commercial plantings of sage (Salvia officinalis) in the Salinas Valley in Monterey County, CA, were affected by a root and crown disease. Roots were necrotic, and crowns and lower stems turned black. Affected plants withered and died. A Phytophthora sp. was consistently isolated from roots and stems of the symptomatic plants. The species was identified as Phytophthora cryptogea based upon the formation of hyphal swellings, morphology of sporangia and oospores, and growth at cardinal temperatures (1). Pathogenicity of representative isolates was confirmed by applying 2 ml of a zoospore suspension (2.0 × 105 zoospores per ml) to roots and crowns of 3-month-old potted sage plants. After treatment, plants were placed for 24 h in shallow trays of water to saturate the root zone, then were removed from trays and incubated in a greenhouse. After 4 days, foliage of all inoculated plants began to wilt. After 7 days, plant crowns and stems turned black and the plants collapsed. P. cryptogea was reisolated and recharacterized from all plants. Control plants, which were treated with water and then handled in the same way as inoculated plants, did not develop any symptoms. The tests were repeated and the results were similar. This is the first report of P. cryptogea attacking commercial plantings of sage. The authors also detected this disease in experimental plantings of sage in Stanislaus County in 1990. Reference: (1) D. C. Erwin and O. K. Ribeiro. 1996. Phytophthora Diseases Worldwide. American Phytopathological Society, St. Paul, MN.

scholarly journals EFFCIENCY OF SOME BIOLOGICAL AND CHEMICAL TREATMENTS AGAINST WHEAT ROOT AND CROWN ROT DISEASE

2019 ◽  
Vol 46 (6) ◽  
pp. 1901-1918
Author(s):  
Ahmed El-Enany ◽  
Entsar Abbas ◽  
M. Zayed ◽  
Mahmoud Atia
Keyword(s):  
Wheat Root ◽  
Crown Rot ◽  
Chemical Treatments ◽  
Root And Crown Rot ◽  
Rot Disease

scholarly journals Wilt, Crown, and Root Rot of Common Rose Mallow (Hibiscus moscheutos) Caused by a NovelFusariumsp.

Plant Disease ◽  
2017 ◽  
Vol 101 (2) ◽  
pp. 354-358 ◽  
Author(s):  
S. L. Lupien ◽  
F. M. Dugan ◽  
K. M. Ward ◽  
K. O’Donnell
Keyword(s):  
Rna Polymerase Ii ◽  
Root Rot ◽  
Molecular Phylogenetics ◽  
Phylogenetic Analyses ◽  
Elongation Factor ◽  
Crown Rot ◽  
Root And Crown Rot ◽  
Fusarium Sp ◽  
Crown And Root Rot ◽  
Rot Disease

A new crown and root rot disease of landscape plantings of the malvaceous ornamental common rose mallow (Hibiscus moscheutos) was first detected in Washington State in 2012. The main objectives of this study were to complete Koch’s postulates, document the disease symptoms photographically, and identify the causal agent using multilocus molecular phylogenetics. Results of the pathogenicity experiments demonstrated that the Fusarium sp. could induce vascular wilt and root and crown rot symptoms on H. moscheutos ‘Luna Rose’. Maximum-likelihood and maximum-parsimony phylogenetic analyses of portions of translation elongation factor 1-α and DNA-directed RNA polymerase II largest and second-largest subunit indicated that the Hibiscus pathogen represents a novel, undescribed Fusarium sp. nested within the Fusarium buharicum species complex.

scholarly journals First Report of Root and Crown Rot of Wasabi (Wasabia japonica Matsum.) Caused by Phytophthora cryptogea in Michigan

Plant Disease ◽  
2012 ◽  
Vol 96 (9) ◽  
pp. 1379-1379 ◽  
Author(s):  
L. L. Granke ◽  
B. R. Harlan ◽  
R. P. Naegele ◽  
M. K. Hausbeck
Keyword(s):  
Sequence Similarity ◽  
Soil Surface ◽  
Pcr Primers ◽  
Root Tissue ◽  
Crown Rot ◽  
Phytophthora Cryptogea ◽  
First Report ◽  
Wasabia Japonica ◽  
Root And Crown Rot ◽  
Crown And Root Rot

In September 2011, a Phytophthora sp. was isolated from wasabi (Wasabia japonica Matsum.) grown commercially in hydroponic culture in a large production facility in southwest Michigan. Approximately 20% of the plants were affected, resulting in serious losses for the grower. Plants exhibited severe wilting and root and crown rot, with soft water-soaked lesions on the crown and dark lesions on the roots. Small pieces of root tissue with dark lesions were excised and plated onto potato dextrose agar and unclarified V8 agar plates amended with 25 ppm of benomyl, 100 ppm of ampicillin, 30 ppm of rifampicin, and 100 ppm of pentachloronitrobenzene. Isolates of a Phytophthora sp. were recovered from root tissue. Isolates produced sporangia abundantly in culture. Sporangia averaged 48 μm long × 34 μm wide and were ellipsoid to ovoid, occasionally obpyriform, and were nonpapillate and noncaducous. Distinct hyphal swellings were noted and chlamydospores were observed rarely in culture. The isolate used for inoculations did not produce oospores alone in culture but was able to produce oospores when paired with an A1 culture of P. capsici and incubated in the dark. Oospores were not observed when the isolate was paired with an A2 culture of P. capsici. No growth was observed at 35°C, and the isolate was identified as Phytophthora cryptogea based on morphological and physiological traits. Pathogen identity was further confirmed using PCR primers specific to P. cryptogea (1). In addition, a BLAST search was conducted using the nucleotide database collection in GenBank comparing our isolate against Phytophthora spp., with 99% sequence similarity to P. cryptogea in two sequenced genes, beta tubulin and cytochrome c oxidase 1 (2). Sequences for the isolate were deposited in the GenBank database under accession numbers JX041520 and JX041521. To fulfill Koch's postulates, six small, potted wasabi seedlings were inoculated by placing 3 g of 1-month-old infested millet (100 g of millet, 72 ml of distilled water, 0.08 g of asparagine, and 10 7-mm diameter V8 agar plugs with actively growing P. cryptogea) onto the soil surface of each pot under coconut coir mulch. Plants were watered heavily after soil infestation and as needed thereafter. Three control plants were inoculated with sterile millet seed. The experiment was repeated once. Wilting was observed within 5 and 7 days, respectively, in the first and second experiment. All six inoculated plants were severely wilted within 25 and 56 days, respectively, except for a single plant in the second experiment that never wilted. Root and crown rot was observed on wilted plants and dark lesions could be observed on root tissue. P. cryptogea was recovered from five of the six plants inoculated in each experiment. None of the control plants in either experiment displayed symptoms of wilting, and the pathogen was not recovered from these plants when pieces of root tissue were excised and plated onto amended V8 agar. To our knowledge, this is the first report of P. cryptogea causing crown and root rot of wasabi. References: (1) D. Minerdi et al. Eur. J. Plant Pathol. 122:227, 2008. (2) L. M. Quesada-Ocampo et al. Phytopathology 101:1061, 2011.

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