alexa Association of Neonectria macrodidyma with Dry Root Rot of Citrus in California
ISSN: 2157-7471

Journal of Plant Pathology & Microbiology
Open Access

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Research Article

Association of Neonectria macrodidyma with Dry Root Rot of Citrus in California

Adesemoye AO1, Mayorquin JS2, Peacock BB2, Moreno K2, Hajeri S3, Yokomi R4 and Eskalen A2*

1Department of Plant Pathology, University of Nebraska-Lincoln, West Central Research and Extension Center, North Platte, NE, USA

2Department of Plant Pathology and Microbiology, University of California, Riverside, CA, USA

3Citrus Pest Detection Program, Central California Tristeza Eradication Agency, Tulare, CA, USA

4USDA, ARS, CDPG, Parlier, CA, USA

*Corresponding Author:
Akif Eskalen
Department of Plant Pathology and Microbiology
University of California, Riverside, CA 92521, USA
Tel: 9518273499
E-mail: [email protected]

Received Date: December 27, 2016; Accepted Date: January 20, 2017; Published Date: January 22, 2017

Citation: Adesemoye AO, Mayorquin JS, Peacock BB, Moreno K, Hajeri S, et al. (2016) Association of Neonectria macrodidyma with Dry Root Rot of Citrus in California. J Plant Pathol Microbiol 8:391. doi: 10.4172/2157-7471.1000391

Copyright: © 2017 Adesemoye AO, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

During yearly surveys that started in 2010 to identify pathogens associated with dry root rot disease of citrus in California, samples with root rot symptoms were collected in Tulare County. Small pieces of tissue from root samples were plated onto potato dextrose agar amended with 0.01% tetracycline and incubated at 25°C. Pure cultures of fungal isolates were identified by morphology and sequence analysis of the Internal Transcribed Spacer and Beta Tubulin regions. Neonectria macrodidyma (Cylindrocarpon macrodidymum) was first recovered in 2011 and has subsequently been recovered multiple times from citrus samples. The pathogen appeared to be widely distributed in association with citrus dry root rot and possibly interacts with Fusarium solani, Phytophthora nicotianae and P. citrophthora, the major soil borne pathogens that were frequently identified from plant samples with root and/or crown rot of citrus in California. The fungal genus Cylindrocarpon (Teleomorph: Neonectria wolenw=Dactylonect ria=Ilyonectria) contains ubiquitous soil borne pathogens that cause black foot disease on a wide range of hosts, including grapevine, strawberry, apple, and conifers. Hosts typically become infected through natural wounds on roots and other below ground parts. In this report, we present strain UCR3312, which is the most recently isolated pathogenic strain in 2015. Considering the potential damage that this organism may cause to the citrus industry, detailed studies are recommended to better understand its distribution, epidemiology, and the general pathogen biology to improve the disease management practices.

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