Article abstract

Journal of Agricultural and Crop Research

Research Article | Published November 2017 | Volume 5, Issue 5, pp. 77-84

 

Management of Pectobacterium carotovorum infections in potatoes (Solanum tuberosum L.) using Tagetes minuta and Capsicum frutescens extracts

 


 

 

Nyamari Jackline Kwamboka*

Wolukau Joseph Ngwela

Gesimba Morwani Robert

 

Email Author

 

     Department of Crops, Horticulture and Soil Sciences, Egerton University, Kenya.


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Citation: Kwamboka NJ, Ngwela WJ, Robert GM (2017). Management of Pectobacterium carotovorum infections in potatoes (Solanum tuberosum L.) using Tagetes minuta and Capsicum frutescens extracts. J. Agric. Crop Res. 5(5): 85-95.

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 Abstract 


Potato experiences losses caused by Pectobacterium carotovorum, in the field and after harvest. The study was carried out to determine the use of Tagetes minuta and Capsicum frutescens extracts in the management of blackleg and soft rot in potatoes caused by P. carotovorum bacteria. Aqueous extracts of T. minuta and C. frutescens each at 40, 30 and 20% concentrations were tested against P. carotovorum in potatoes with copper oxychloride and water as the positive and negative controls respectively. Data was collected on blackleg incidence and severity on potato plants (in the field), soft rot incidence and severity on tubers (at harvest) and postharvest percent tuber rots. Plants treated with T. minuta extracts and copper oxychloride showed significantly low disease incidence and severity compared to those treated with C. frutescens and water. The potato plants treated with 40 and 30% T. minuta; and copper oxychloride recorded low disease symptom development (2 plants per plot) and severity of 40 to 54% while those treated with water and C. frutescens showed high disease symptom development (4 plants per plot) and severity of 57 to 93%. The percent tuber infections significantly differed among the treatments. Copper oxychloride and T. minuta recorded the lowest percent postharvest infections of 6.5 to 12.11% while C. frutescens had high infections of 40 to 95%. T. minuta had antibacterial activity against P. carotovorum and therefore it can be used in the management of blackleg and soft rot in potatoes. It is locally available and gets rapidly degraded with no persistence and bio-accumulation in the environment, a major problem associated with synthetic agrochemicals.

Keywords  Tagetes minuta   Capsicum frutescens   extracts   P. carotovorum   potatoes  

 

 

 

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