Plant health
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Plant health
Research, new developments and findings of organisms, harmful to plants.
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Evaluation of Fungicides for the Management of Botryosphaeria Canker of Grapevines

Evaluation of Fungicides for the Management of Botryosphaeria Canker of Grapevines | Plant health | Scoop.it
Plant Disease, Volume 96, Issue 9, Page 1303-1308, September 2012.
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Differences in the genomes of related plant pathogens

Differences in the genomes of related plant pathogens | Plant health | Scoop.it
Even in closely related species, lifestyle molds the genetic makeup of pathogens and how their genes are used.
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Occurrence and Genetic Diversity of Winona-Like Plum pox virus Isolates in Russia

Occurrence and Genetic Diversity of Winona-Like Plum pox virus Isolates in Russia | Plant health | Scoop.it

In studying the distribution and genetic diversity of Plum pox virus (PPV) in Russia, over a dozen new PPV isolates belonging to the strain Winona (PPV-W) were identified by immunocapture reverse-transcription polymerase chain reaction. The data obtained indicate wide dissemination of PPV-W isolate in stone fruit in the European part of the former USSR.

 

Plant Disease, Volume 96, Issue 8, Page 1135-1142, August 2012.

Anna Sheveleva and Peter Ivanov, Lomonosov Moscow State University; Yuri Prihodko, All-Russian Plant Quarantine Center, Moscow region,; Delano James, Sidney Laboratory–Centre for Plant Health, Canada; and Sergei Chirkov, Department of Virology, Biological Faculty, Lomonosov Moscow State University

http://dx.doi.org/10.1094/PDIS-12-11-1045-RE

 

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PRO/PL> Witches' broom, longan | Geostrategic Forecasting

PRO/PL> Witches' broom, longan | Geostrategic Forecasting | Plant health | Scoop.it

Witches' broom disease is sweeping through more than 60 percent of the longan-growing area in the Cuu Long (Mekong) Delta, leaving many farmers with severe losses, according to the Plant Protection Department. The disease appeared in Viet Nam in 2003 from infected longan (Dimocarpus longan) strains imported from neighbouring countries, according to experts. There are no effective measures to prevent or control the disease.

 

Comment: The news has been published via International Society of Infectious Diseases. For some plant diseases only very few data is available on the extent of the disease, on its biology and epidemiology. Since witches' broom symptoms can apear on differnet fruit species of Prunus, Malus and other fruit trees in other parts of the world, also information on their control should be searched there. The causal agent is phytoplasma, which can be determined only in lab diagnostic procedure. In general the spread of the disease is possible by care for healthy planting material and control of insect vectors. Many new findings have become available in recent years about the transmission and epidemiology of phytoplasma diseases.

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Phytopathology

Phytopathology | Plant health | Scoop.it

June 2012 Issue of Phytopathology Now Online:

  • Biological Impact of Divergent Land Management Practices on Tomato Crop Health
  • Understanding Growers' Decisions to Manage Invasive Pathogens at the Farm Level
  • Dispersal of Potato Cyst Nematodes Measured Using Historical and Spatial Statistical Analyses...

 

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Ag Answers: Open house to showcase careers, advances in plant pathology and ag sciences

Ag Answers: Open house to showcase careers, advances in plant pathology and ag sciences | Plant health | Scoop.it

"Feeding the World in 2050: Career Opportunities for Future Scientists," hosted by the department of Plant Pathology, will emphasize the wide array of degree programs and career opportunities in plant pathology and agricultural sciences, said Anne Dorrance, a plant pathologist with joint appointments with OSU Extension and OARDC.

 

RT @Ag_Answers: Open house to showcase careers, advances in plant pathology and #ag sciences http://t.co/QRZafAGb #OSU...

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Simultaneous detection of 8 viruses and 2 viroids of stone fruit trees

Simultaneous detection of 8 viruses and 2 viroids of stone fruit trees | Plant health | Scoop.it

A new molecular technique has been developed to detect simultaneously:
- Apple mosaic virus (ApMV)
- Prunus necrotic ringspot virus (PNRSV)
- Prune dwarf virus (PDV)
- American plum line pattern virus (APLPV)
- Plum pox virus (PPV)
- Apple chlorotic leaf spot virus (ACLSV)
- Plum bark necrosis and stem-pitting associated virus (PBNSPaV)
- Apricot latent virus (ApLV)
- Hop stunt viroid (HSVd)
- Peach latent mosaic viroid (PLMVd)

 

Peiró A, Pallás V, Sánchez-Navarro JA (2012) Simultaneous detection of eight viruses and two viroids affecting stone fruit trees by using a unique polyprobe. European Journal of Plant Pathology 132(4), 469-475.

http://www.springerlink.com/content/xw11115683416648/

 


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Phylogenetic and Pathogenic Analyses Show That the Causal Agent of Apple Ring Rot in China Is Botryosphaeria dothidea

Apple ring rot and Botryosphaeria canker are severe diseases affecting apple production in China, but there is confusion regarding which pathogens cause these diseases and their similarity to other diseases, such as white rot of apple, and ring rot and Botryosphaeria canker of pear. In this study, the pathogen of apple ring rot in China was compared with the pathogen of apple ring rot in Japan and Korea, the pathogen of Botryosphaeria canker of apple and pear in China, the pathogen of pear ring rot in China, and the pathogen of white rot of apple in the United States.

 

Plant Disease, Volume 96, Issue 4, Page 486-496, April 2012.tp://dx.doi.org/10.1094/PDIS-08-11-0635

 

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EPPO

EPPO | Plant health | Scoop.it

The Panel on Diagnostics in Bacteriology met in Sofia at the kind invitation of the Central Laboratory for Plant Quarantine, part of the Bulgarian Food Safety Agency. This was the third joint meeting with the European Association of Phytobacteriologists (EAP).View the main conclusions of the meeting at 

 

http://www.eppo.org/MEETINGS/2011_meetings/bacteriology.htm


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Phytoplasmas, vectors and measures for disease control

Phytoplasmas, vectors and measures for disease control | Plant health | Scoop.it

The most widespread phytoplasmas, vectors and measures for disease control in Slovenia


Phytoplasmas, as fastidious wall-less mollicutes, colonize phloem tissue of many plant species, including grapevine and fruit trees. They are transmitted between plants by vegetative propagation and by sap-sucking insect vectors, which enable spread of the diseases.

‘Candidatus Phytoplasma mali’, associated with apple proliferation, ‘Ca. P. prunorum’, associated with European stone fruit yellows and ‘Ca. P. pyri’, associated with pear decline, were detected in several fruit-growing areas of Slovenia. The most widespread phytoplasma on grapevine in Slovenia was the stolbur phytoplasma, (‘bois noir’), but ‘Flavescence dorée’ phytoplasma, associated with serious disease of grapevine, has been detected in Slovenian vineyards.


Mehle N  et al. (2012) The most widespread phytoplasmas, vectors and measures for disease control in Slovenia.- Phytopathogenic Mollicutes 2011(1)2 p 65- 76. Online ISSN : 2249-4677. IndianJournals.com 

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Research collaboration with Australian plant biosecurity center set to secure food supplies, increase academic exchanges

Research collaboration with Australian plant biosecurity center set to secure food supplies, increase academic exchanges | Plant health | Scoop.it

Research collaboration between US (Kansas State University will be the only American university involved) and Australian plant biosecurity center.


Officials at Kansas State University and at Australia's leading plant pests research center are finalizing an agreement for a collaboration aimed at increasing agricultural security in both countries.

Once formalized, the six-year partnership will pair Kansas State University plant pathology and entomology experts with those from the Australian Plant Biosecurity Cooperative Research Centre, or CRC. The center is a consortium among several of Australia's leading governmental research institutions and universities. Through this partnership, researchers will study emerging plant diseases and insect pests that threaten American and Australian agricultural systems and develop new strategies and technologies to defend against them.


NewsReleaseWire.com

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Plants use circadian rhythms to prepare for battle with insects ...

Plants use circadian rhythms to prepare for battle with insects ... | Plant health | Scoop.it

In recent years, scientists have begun to apply powerful genetic tools to the study of plant circadian rhythms. Researchers have found that as many as one-third of the genes in Arabidopsis thaliana - a widely studied species in plant biology - are activated by the circadian cycle. Rice biochemist Michael Covington found that some of these circadian-regulated genes were also connected to wounding responses.


In a study of the molecular underpinnings of plants' pest resistance, Rice University biologists have shown that plants both anticipate daytime raids by hungry insects and make sophisticated preparations to fend ...

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EDIS – Electronic Data Information Source

February 2012. EDIS is the Electronic Data Information Source of UF/IFAS Extension and a collection of information on different advices on several topics was collected by Woogle (sample page) tagged "florida data recovery"...

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Citrus Responses to Xylella fastidiosa Infection

Citrus Responses to Xylella fastidiosa Infection | Plant health | Scoop.it
Plant Disease, Volume 96, Issue 9, Page 1245-1249, September 2012.
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Some Common Important Diseases of Crops | infoaccess24

Some Common Important Diseases of Crops | infoaccess24 | Plant health | Scoop.it

Plant pathology considers any abnormal growth and development of plant. Plant disease can be defined as any abnormal condition in a plant body that completely interferes with its vital physiological processes and its caused by pathogenic microorganisms, parasites, unfavorable environmental

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Baseline Sensitivity and Cross-Resistance to Succinate-Dehydrogenase-Inhibiting and Demethylation-Inhibiting Fungicides in Didymella bryoniae

Baseline Sensitivity and Cross-Resistance to Succinate-Dehydrogenase-Inhibiting and Demethylation-Inhibiting Fungicides in Didymella bryoniae | Plant health | Scoop.it

Didymella bryoniae, which causes gummy stem blight of watermelon, has a history of developing resistance to fungicides, most recently the succinate-dehydrogenase-inhibiting (SDHI) fungicide boscalid. To facilitate fungicide resistance monitoring, baseline sensitivity distributions were established for demethylation-inhibiting (DMI) fungicides tebuconazole and difenoconazole and the SDHI fungicide penthiopyrad, and reestablished for the SDHI fungicide boscalid.

Plant Disease, Volume 96, Issue 7, Page 979-984, July 2012.

A. Thomas, D. B. Langston, Jr., and K. L. Stevenson, Department of Plant Pathology, University of Georgia, Tifton 31793-5766

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Update: Plant Health News (9 May 12)

Update: Plant Health News (9 May 12) | Plant health | Scoop.it

Disease-resistant raspberries – from FreshFruitPortal.com Here’s a taste of some of the latest stories about plant health, including the development of disease-resistant raspberries in the U.S., news on a biofertilizer that could save citrus crops...

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National Plant Diagnostic Network

National Plant Diagnostic Network | Plant health | Scoop.it

National Plant Diagnostic Network by University of Florida: an excellent example of on-line training, monitoring organisation and information sharing.

via @plantclinic

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Novel approach to curing crop diseases tested

Novel approach to curing crop diseases tested | Plant health | Scoop.it

PhysOrg.com - Sugar may be a treat for humans, but for aphids it can be life threatening. A $452,000 grant to Cornell and Boyce Thompson Institute for Plant Research (BTI) will fund research exploiting this vulnerability to control agriculturally important insect pests.

When aphids and similar insects feed on plants, they transmit viruses, bacteria and other disease-causing microbes to the plant, there is an urgent need for new strategies for insect control, because insects are developing resistance to traditional broad spectrum insecticides. Douglas and Georg Jander, an associate scientist at BTI, proposed a new method to deter insects: genetically engineering plants to protect themselves by disrupting crucial processes in the insect gut for coping with the high levels of sugar in their diet of plant sap.

Genes in the insect can be specifically targeted without any side effect on the plants. RNA interference (RNAi) or gene silencing will be tested in two model plant species - Arabidopsis and tobacco - and with insect pests including the peach-potato aphid, the sweet potato whitefly and the potato psyllid. 

 

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Horizon 2020 - the Framework Programme for Research and Innovation - European Commission

Horizon 2020 - the Framework Programme for Research and Innovation - European Commission | Plant health | Scoop.it

The European Commission's Horizon 2020 is a framework document. The proposal is divided into three priority areas: Excellent Science; Industrial Leadership; Societal Challenges. In addition the roles of the JRC and the European Institute of Innovation and Technology (EIT) are specified.

 

In 2011 the European Commission drafted proposals for a Regulation to establish the development of the next Framework Programme to replace the Framework Programme 7 (FP7) which was coming to an end. This was entitled Horizon 2020. The European Commission has agreed the proposals and it is expected that final agreement of the European Parliament will be reached in 2013, with the launch of the first calls expected in 2014.

 

The continuation of identifying research priorities and communicating these priorities to DG Research and Innovation, the Joint Research Centre (JRC) as well as the Member States is an aspect of European Food Safety Authority's Science Strategy relating to the strengthening the scientific evidence for risk assessment and risk monitoring. Contributing to the developing Horizon 2020 programme will be integral in meeting the objectives in this area.

 

Within the proposal Part III, Societal Challenges relates directly to the policy priorities and societal challenges identified in the Europe 2020 Strategy. One of the main objectives in this part focuses on “Food security, sustainable agriculture, marine and maritime research, and the bio economy” with the specific objective “to secure sufficient supplies of safe and high quality food and other bio-based products, by developing productive and resource-efficient primary production systems, fostering related ecosystem services, along side competitive and low carbon supply chains.” Plant health with research on harmful organisms fits to this safe food reference in the proposal. The broad lines of activities under this part include „sustainable and competitive agri-food sector for a safe and healthy diet‟.

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Crop and Non-Crop Plants as Potential Reservoir Hosts of Alfalfa mosaic virus and Cucumber mosaic virus for Spread to Commercial Snap Bean

Crop and Non-Crop Plants as Potential Reservoir Hosts of Alfalfa mosaic virus and Cucumber mosaic virus for Spread to Commercial Snap Bean | Plant health | Scoop.it

Diseases caused by aphid-transmitted viruses such as Alfalfa mosaic virus (AMV) and Cucumber mosaic virus (CMV) have increased in snap bean (Phaseolus vulgaris) in the Midwestern United States. Plants immediately surrounding agricultural fields may serve as primary virus inocula for aphids to acquire and transmit to bean crops.

 

Plant Disease, Volume 96, Issue 4, Page 506-514, April 2012.

http://dx.doi.org/10.1094/PDIS-02-11-0089

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Baseline Sensitivity of Monilinia fructicola from China

Chen FP et al. (2012) presented the first baseline sensitivity of fungi, causing brown rot of stone fruits, M. fructicola collected from China to a DMI fungicide.

Sterol 14α-demethylase inhibitors (DMIs) continue to be important in the management of brown rot of Monilinia spp. worldwide. In this study, the sensitivity of 100 Monilinia fructicola isolates from four unsprayed orchards and two packinghouses in Beijing, China, to the new DMI fungicide was evaluated.

Laboratory mutants resistant to SYP-Z048 were generated using UV irradiation but no mutants occurred spontaneously. Resistance was stable after 10 weekly consecutive transfers on fungicide-free medium. The inability of M. fructicola to generate spontaneous DMI-resistant mutants coupled with reduced fitness of Y136F mutants can explain why this target site mutation has not yet emerged as a DMI fungicide resistance determinant in M. fructicola field populations worldwide.


Chen FP et al. (2012) Baseline Sensitivity of Monilinia fructicola from China to the DMI Fungicide SYP-Z048 and Analysis of DMI-Resistant Mutants.- Plant Disease, Volume 96, Issue 3, Page 416-422, March 2012.  http://dx.doi.org/10.1094/PDIS-06-11-0495

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New wheat varieties resist global wheat threat - PhysOrg.com

New wheat varieties resist global wheat threat - PhysOrg.com | Plant health | Scoop.it

Speaking as a panelist in the "Emerging Risks in the Global Food System" a session organized by William Fry, Cornell professor of plant pathology, Singh noted: "... enhanced breeding techniques such as shuttle breeding are helping create new durable disease-resistant varieties of wheat that will increase yields to better meet global demand."

PhysOrg.com

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Study shows temperatures may change disease resistance in wheat - PhysOrg.com

Study shows temperatures may change disease resistance in wheat - PhysOrg.com | Plant health | Scoop.it

PhysOrg.com by Kay Ledbetter:


Wheat streak mosaic virus is the most prevalent disease in the southwestern wheat producing region of the U.S. Dr. Charlie Rush and Jacob Price, AgriLife Research plant pathologists in Amarillo began a study with varieties of wheat with bred-in resistance to wheat streak mosaic virus and an influence of different temperatures.

The disease incidence depends on vectors: wheat curl mites, which have the potential to build high populations very quickly. When populations explode, wheat streak can spread to epidemic proportions in a short time, causing devastating losses throughout the wheat growing region. The temperatures affect this process: “If you have a lower number of mites, and a lower number of those are carrying the wheat streak virus, it will reduce the incidence of disease and reduce the potential for development of an epidemic,” Rush said.

Study shows that temperatures above 24 deg C may change disease resistance to the virus bred into them. While several varieties of wheat have resistance, there has been a problem with that genetic resistance breaking down in temperatures above 75 degrees F.

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Polk Small Farms: New and Revised Agriculture Publications ...

Polk Small Farms: New and Revised Agriculture Publications ... | Plant health | Scoop.it

The blog is for Polk County Florida small farms and pesticide applicators as a method of communication and sharing information. It is administered by the University of Florida IFAS Extension Polk County Extension Agent, Mary Beth Henry.

She has listed new and revised EDIS publications in the Agriculture program area that have been released to the public in January 2012. 

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