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1. A Nonwounding Greenhouse Screening Protocol for Prediction of Field Resistance of Hybrid Poplar to Septoria Canker

Author:
Qin, Ruqian; Stanosz, Glen R.; LeBoldus, Jared M.
Source:
Plant disease 2014 v.98 no.8 pp. 1106-1111
ISSN:
0191-2917
Subject:
Populus; Septoria; clones; conidia; crops; fungi; greenhouse production; greenhouses; hybrids; industry; leaf spot; pathogens; prediction; regression analysis; screening; stem cankers; trees; North America
Abstract:
... Populus spp. and their hybrids are short-rotation woody crops which supply fiber to a diversity of industries in North America. The potential of hybrid poplar trees has been limited by the fungal pathogen Septoria musiva, the cause of leaf spot and stem canker of Populus spp. An inoculation protocol that does not rely on stem wounding to achieve infection was recently developed to screen poplar cl ...
DOI:
10.1094/PDIS-11-13-1152-RE

2. Damping-Off and Root Rot of Pepper Caused by Fusarium oxysporum in Almería Province, Spain

Author:
Pérez-Hernández, A.; Serrano-Alonso, Y.; Aguilar-Pérez, M. I.; Gómez-Uroz, R.; Gómez-Vázquez, J.
Source:
Plant disease 2014 v.98 no.8 pp. 1159
ISSN:
0191-2917
Subject:
Capsicum annuum; DNA; Dianthus caryophyllus; Fusarium oxysporum; agar; chlamydospores; conidia; containers; damping off; genetic databases; greenhouses; growth retardation; inoculum; leaves; necrosis; pathogenicity; pathogens; pepper; root rot; roots; seedlings; sowing; summer; sweet peppers; temperature; vermiculite; wilting; Spain
Abstract:
... Bell pepper (Capsicum annuum L.) is intensively cropped in ~9,920 ha of plastic houses in southern Spain. In summer 2013, pepper seedlings cv. Melchor, Acorde, Galena, Prometeo, and Souleria, with 4 to 8 leaves, grown in a nursery greenhouse near El Ejido, Almería Province, exhibited root rot and stunting. Incidence of symptomatic plants was ~35% among over 10 million. Fusarium sp. was consistentl ...
DOI:
10.1094/PDIS-02-14-0194-PDN

3. First Report of Aphelenchoides besseyi Causing White Tip Disease of Rice in Jilin Province, China

Author:
Ou, S. Q.; Gao, J.; Peng, D. L.; Qi, C. Y.; Zhang, J. H.; Meng, Y.; Lu, B. H.
Source:
Plant disease 2014 v.98 no.8 pp. 1165
ISSN:
0191-2917
Subject:
Aphelenchoides besseyi; DNA primers; body length; cities; esophagus; females; genes; genetic databases; growth retardation; inflorescences; internal transcribed spacers; intestines; leaves; males; necrosis; oocytes; pathogens; plant parasitic nematodes; polymerase chain reaction; quarantine; ribosomal DNA; rice; seeds; surveys; tail; China; India; Russia
Abstract:
... White tip disease of rice caused by the plant-parasitic nematode Aphelenchoides besseyi is an important domestic quarantine issue causing heavy yield losses of rice. During a survey for rice diseases in 2013, suspect white tip disease of rice was observed in the cities of Changchun and Gongzhuling, Jinlin Province, China. Leaf tips of susceptible rice varieties were white or yellow, becoming brown ...
DOI:
10.1094/PDIS-01-14-0020-PDN

4. First Report of Cercospora apii, Causal Agent of Cercospora Early Blight of Celery, in Serbia

Author:
Milosavljević, A.; Pfaf-Dolovac, E.; Mitrović, M.; Jović, J.; Toševski, I.; Duduk, N.; Trkulja, N.
Source:
Plant disease 2014 v.98 no.8 pp. 1157
ISSN:
0191-2917
Subject:
Apium graveolens var. dulce; Cercospora apii; agar; blight; calmodulin; celery; conidia; conidiophores; disease severity; ethanol; fungi; genes; genetic databases; greenhouses; histones; internal transcribed spacers; leaves; mycelium; pathogenicity; pathogens; seedlings; surveys; vegetable crops; Serbia
Abstract:
... Celery (Apium graveolens var. dulce) is a very important vegetable crop intensively cultivated in eastern and southern Serbia. During a field survey in August and September 2012, we observed symptoms similar to those of Cercospora early blight in eastern Serbia, with some of the affected fields showing up to 80% disease severity. The lesions on leaves were amphigenous, subcircular to angular and m ...
DOI:
10.1094/PDIS-02-14-0135-PDN

5. First Report of Mucor Rot on Stored ‘Gala’ Apple Fruit Caused by Mucor piriformis in Pennsylvania

Author:
Li, J.; Gaskins, V. L.; Yan, H. J.; Luo, Y. G.; Jurick II, W. M.
Source:
Plant disease 2014 v.98 no.8 pp. 1157
ISSN:
0191-2917
Subject:
Mucor piriformis; apples; chlorine; controlled atmosphere storage; cracking; cultivars; fungi; genes; mycelium; nucleotide sequences; orchards; pathogens; postharvest diseases; ribosomal DNA; sanitation; solar radiation; sporangia; zygospores; Pennsylvania
Abstract:
... Mucor piriformis E. Fischer causes Mucor rot of pome and stone fruits during storage and has been reported in Australia, Canada, Germany, Northern Ireland, South Africa, and portions of the United States (1,2). Currently, there is no fungicide in the United States labeled to control this wound pathogen on apple. Cultural practices of orchard sanitation, placing dry fruit in storage, and chlorine t ...
Handle:
10113/61180
DOI:
10.1094/PDIS-02-14-0149-PDN

6. First Report of Rust of Plumeria rubra Caused by Coleosporium plumeriae in Guangdong Province, China

Author:
Yang, Q. Y.; Lin, B. R.; Zhang, J. X.; Shen, H. F.; Pu, X. M.; Wang, Z. W.; Zeng, D. Q.
Source:
Plant disease 2014 v.98 no.8 pp. 1154
ISSN:
0191-2917
Subject:
Coleosporium; Plumeria rubra; abscission; aesthetics; cultivars; dew; flowers; gardens; internal transcribed spacers; leaves; necrosis; ornamental trees; ornamental value; parks; pathogenicity; pathogens; planting; plastic bags; ribosomal DNA; rust diseases; spraying; summer; teliospores; urediniospores; China
Abstract:
... Plumeria spp. are ornamental trees commonly planted in parks and gardens, and Plumeria rubra cultivars (Frangipani) is most common in Guangdong Province, China. A rust disease of P. rubra was observed on leaves of susceptible plants from August to December 2013. Ten nurseries were surveyed in September 2013, and 91% (220 of 240) of the plumeria plants were infected with rust. Symptoms first appear ...
DOI:
10.1094/PDIS-01-14-0019-PDN

7. First Report of the Stubby-Root Nematode (Paratrichodorus allius) From a Corn Field in Ohio

Author:
Lopez-Nicora, H. D.; Mekete, T.; Sekora, N.; Niblack, T. L.
Source:
Plant disease 2014 v.98 no.8 pp. 1164
ISSN:
0191-2917
Subject:
DNA; DNA primers; Helicotylenchus; Hoplolaimus; Paratrichodorus; Pratylenchus; Tobacco rattle virus; Tylenchorhynchus; adults; body length; corn; crop losses; ectoparasites; esophagus; females; genetic databases; hosts; intestines; migratory behavior; morphometry; nematology; pathogens; plant parasitic nematodes; planting; polymerase chain reaction; potatoes; ribosomal RNA; roots; sclerotization; sequence homology; sieving; soil sampling; soil texture; soybeans; spermatheca; sucrose; wheat; Ohio
Abstract:
... Stubby-root nematodes (family Trichoridae) are an economically important group of ectoparasites that feed on roots, vector tobraviruses, and cause substantial crop loss (1,2,3). In June 2013, 48 soil samples were submitted to the Nematology Laboratory at Ohio State University for nematode analysis from a field planted to corn in Wood County, Ohio. The soil texture was sandy and the field was previ ...
DOI:
10.1094/PDIS-02-14-0206-PDN

8. Optimization of Headspace Solid-Phase Microextraction Conditions for the Identification of Phytophthora cinnamomi Rands

Author:
Qiu, Rui; Qu, Dong; Hardy, Giles E. St. J.; Trengove, Robert; Agarwal, Manjree; Ren, Yonglin
Source:
Plant disease 2014 v.98 no.8 pp. 1088-1098
ISSN:
0191-2917
Subject:
Phytophthora cinnamomi; Pythium; absorption; culture media; detection limit; flame ionization; headspace analysis; pathogens; regression analysis; soil sampling; solid phase microextraction; volatile organic compounds
Abstract:
... A robust technique was developed to identify Phytophthora cinnamomi using headspace solid-phase microextraction (HS-SPME) combined with gas chromatography (GC) coupled to a flame ionization detector (FID) for analyzing volatile organic compounds (VOCs). Six fiber types were evaluated and results indicated that the three-phase fiber 50/30 μm divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDM ...
DOI:
10.1094/PDIS-12-13-1258-RE

9. QoI Resistance and Mitochondrial Genetic Structure of Zymoseptoria tritici in Morocco

Author:
Siah, A.; Elbekali, A. Y.; Ramdani, A.; Reignault, P.; Torriani, S. F. F.; Brunner, P. C.; Halama, P.
Source:
Plant disease 2014 v.98 no.8 pp. 1138-1144
ISSN:
0191-2917
Subject:
DNA; Mycosphaerella graminicola; fungi; fungicides; gene flow; haplotypes; mitochondria; nucleotide sequences; pathogens; phylogeny; population structure; provenance; statistics; teleomorphs; wheat; Europe; Morocco
Abstract:
... In total, 230 single-conidial isolates of the fungal wheat pathogen Zymoseptoria tritici (formerly Septoria tritici, teleomorph: Mycosphaerella graminicola) were sampled in Morocco in 2008 and 2010 to assess resistance against quinone outside inhibitors (QoIs), a widely used group of fungicides in wheat pest management. All 134 isolates sampled in 2008 were QoI sensitive. In contrast, 9 of the 96 ...
DOI:
10.1094/PDIS-10-13-1057-RE

10. Sources and Availability of Inoculum and Seasonal Survival of Sphaeropsis pyriputrescens in Apple Orchards

Author:
Xiao, C. L.; Kim, Y. K.; Boal, R. J.
Source:
Plant disease 2014 v.98 no.8 pp. 1043-1049
ISSN:
0191-2917
Subject:
Malus; Sphaeropsis; apples; bark; branches; crop production; dieback; fungi; growing season; inoculum; markets; mycelium; orchards; pathogens; plant rots; pollen; pycnidia; trees; viability; Washington (state)
Abstract:
... Sphaeropsis pyriputrescens is the cause of Sphaeropsis rot, a recently reported postharvest fruit rot disease of apple. Infection of apple fruit by the fungus is believed to occur in the orchard, and symptoms develop during storage or in the market. S. pyriputrescens also is the cause of a twig dieback and canker disease of apple and crabapple trees. To determine sources of pathogen inoculum in th ...
DOI:
10.1094/PDIS-12-13-1218-RE