Sky Journal of Agricultural Research Vol. 6(1), pp. 001-005, January, 2017. Available online http://www.skyjournals.org/SJAR
ISSN 2315-8751 ©2017 Sky Journals

 

Full length Research Paper

Assessment of commercially grown coffee types for their tolerance to bacterial blight of coffee (BBC) at Sidama and Gedeo Zones, Southern Ethiopia

 

Demelash Teferi* and Ashenafi Ayano
 

Jimma Agricultural Research Center, Jimma, Ethiopia.      

 

*Corresponding author. E-mail: teferidemelash2008@gmail.com

 

Accepted 12 December, 2016

 

 

Abstract

Bacterial blight of coffee also known as Elgon or Solai dieback, caused by Pseudomonas syringae pv garcae van Hall, is reported as a serious disease of Arabica coffee in Kenya and Brazil. Outbreak of bacterial blight of coffee was reported in three districts in southern Ethiopia where the famous Sidama specialty coffees are produced. The results of three years data showed that the disease syndrome on young, mature and older coffee plants were similar with bacterial blight of coffee documented elsewhere. The disease invariably attacks coffee leaves, branches and shoots with characteristic blight symptoms. The infected branches and shoots start die-back from the point of infection towards the tip while coffee berries on infected braches are also completely destroyed leading to total crop failure. Currently the spread of the disease was reported at Gedeo, Sidama, Wolita and Kembata-Tembaro Zone of SNNPR regional state. To update the current status of the disease and evaluate the reaction of released Arabica coffee cultivars survey was under taken in six and three district of Sidama and Gedeo Zones respectively. Nine coffee cultivars were evaluated for their tolerance to bacterial blight of coffee under field condition. The current survey result revealed the disease is observed in all released coffee cultivars at different locations at various levels of disease severities. The highest disease severity value of 12% was observed on Angefa at Aletawondo. Less than 3% disease severity was observed at Sidama Zone on coffee cultivars 74110, 74112 and 74158. On the other hand at Gedeo Zone severity value of 10.8, 15 and 15.6 % was observed on coffee cultivars of Odicha, Koti and Angefa. Conversely coffee bacterial blight infection was not observed or negligible on compact released cultivars (74110, 741140). On local coffee land race disease severity varied between 12-42 and 12-25 % for Sidama and Gedeo respectively. In general low infection was also observed on well managed coffee plantations. Farmer’s preference increased to use coffee cultivars 74110 and 74112 due to moderately tolerance against bacterial blight of coffee. Further screening commercial coffee cultivars in laboratory is recommended to have reliable information’s on their resistance level. Moreover it is recommended to conduct successive year’s field observations to look for the dynamics of the disease in the areas in order to understand and factors associated which favors the disease epidemics.  


Key words:
Coffee arabica, released coffee cultivars, bacterial blight of coffee.

 

 

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