Navigation Links
Thermotherapy rids azaleas of deadly fungal disease
Date:12/13/2011

POPLARVILLE, MSAzalea web blight, caused by a species of the plant pathogen Rhizoctonia, occurs each year on some containerized azalea cultivars during nursery production, particularly in the southern and eastern United States. Azalea shoots can harbor the pathogen, spreading the devastating, costly disease through propagation.

Research has indicated that simply submerging terminal leafy cuttings of 'Gumpo White' azalea in 50C water for 21 minutes eliminates binucleate Rhizoctonia species from plant tissues. Before recommending commercial use of the practiceknown as "hot water treatment" or "thermotherapy"industry professionals needed to learn more about potential damage to evergreen azaleas resulting from the treatments. Warren E. Copes of the USDA-Agricultural Research Service (Thad Cochran Southern Horticultural Laboratory) and Eugene K. Blythe of the Coastal Research and Extension Center at Mississippi State University designed experiments to test 12 azalea cultivars for rooting response and sensitivity to a variety of hot water treatments.

Copes and Blythe used terminal cuttings of the azalea cultivars Conleb (Autumn Embers), Fashion, Formosa, Gumpo White, Hardy Gardenia, Hershey Red, Macrantha Pink, Midnight Flare, Red Ruffles, Renee Michelle, Roblel (Autumn Debutante), and Watchet. The cuttings from all 12 cultivars were collected and submerged or not submerged in 50C water for 20 minutes before propagation in one experiment; all cultivars tolerated the submersion test. Cuttings collected from the 12 cultivars were submerged in 50C water for 20, 40, 60, and 80 minutes in a second experiment. "The cultivars varied in sensitivity when exposed to 50C water for 60 to 80 minutes, resulting in differing responses in root development and final leaf count", Copes said.

In a third experiment degrees of leaf damage caused by hot water submersion or by leaf removal were evaluated for the effect on root development and subsequent leaf count on rooted cuttings of 'Gumpo White' and 'Roblel'. According to the results, incremental increases in leaf damage from hot water resulted in incremental reductions in the final leaf count and extent of root development for the two cultivars, while increasing leaf removal caused no reduction until 75% or greater leaf area was removed. "Despite the risks imposed by submersing azalea cuttings, we found all 12 cultivars to be tolerant of submersion durations long enough to eliminate binucleate Rhizoctonia species from stem and leaf tissue with only a low likelihood of sustaining detrimental damage", the scientists wrote in the report published in HortScience.

Copes and Blythe concluded that hot water treatment provides an alternative and effective disease control method for eliminating Rhizoctonia from azalea cuttings. "Thermotherapy provides an example of how simple techniques may provide effective disease control when appropriately applied."


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Virginia Tech engineers introduce thermotherapy as a chemotherapy alternative
2. Drug may slow spread of deadly eye cancer
3. Scripps Research team finds a weak spot on deadly ebolavirus
4. Report answers questions about E. coli: The good, the bad and the deadly
5. Scientists report major advance in human antibody therapy against deadly Hendra virus
6. Flight patterns reveal how mosquitoes find hosts to transmit deadly diseases
7. Worm cell death discovery could lead to new drugs for deadly parasite
8. Amphibians: Beware young beetles deadly siren call
9. Abnormal activation of a protein may explain deadly link between high salt intake and obesity
10. Scientists make turfgrass safer for animals, deadly for insects
11. Uncovering the spread of deadly cancer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Thermotherapy rids azaleas of deadly fungal disease
(Date:2/9/2016)... Aware, Inc. (NASDAQ: AWRE ), a leading supplier ... fourth quarter and year ended December 31, 2015.  ... of 2015 was $6.9 million, an increase of 61% compared to ... the fourth quarter of 2015 was $2.6 million compared to $0.2 ... --> --> Higher revenue and operating income in ...
(Date:2/8/2016)... February 8, 2016 Worldcore ... which presents innovation for clients, comfort and unbeatable ... VoiceKey. --> Worldcore is the ... for clients, comfort and unbeatable security, with a ... Worldcore is the first EU-regulated ...
(Date:2/4/2016)... 2016 The field of Human Microbiome ... most popular hubs of the biotechnology industry. While ... studies of human microbiota, have garnered a lot ... microbiome space has literally exploded in terms of ... report focuses on biomedical aspects of research, development, ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... Springfield, MO (PRWEB) , ... February 10, 2016 ... ... company, will attend the International Society of Pharmaceutical Engineering (ISPE) Rocky Mountain Chapter ... of ISPE is expecting to fill more than 100 tables for its annual ...
(Date:2/10/2016)... ... February 10, 2016 , ... Curoverse ... Azure. On Azure, Arvados provides capabilities for managing and processing genomic and health ... Azure from major institutions collecting and analyzing genomic data,” said Adam Berrey chief ...
(Date:2/9/2016)... ... February 09, 2016 , ... With a presidential election in ... Care Business Conference will bring together over 500 top healthcare leaders for a night ... transformation. The conference, organized by MBA students of the University of Pennsylvania’s Wharton School, ...
(Date:2/9/2016)... ... February 09, 2016 , ... Clinovo , the cloud-based ... Electronic Data Capture (EDC) system ClinCaptureand its new Contract Research Organization (CRO) Partner ... Conference in San Mateo, California on February 10th and 11th. Watch 2-min ...
Breaking Biology Technology: