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The effects of mild cacao swollen shoot virus strains N1 and SS365B on growth and yield of cacao

  • Viral and Viroid Diseases
  • Published:
Journal of General Plant Pathology Aims and scope Submit manuscript

Abstract

A field experiment started at the Cocoa Research Institute of Ghana in 2007 to investigate the effects of the cacao swollen shoot virus (CSSV) mild stains N1 and SS365B on growth and yield of mixed hybrid cacao (Theobroma cacao L.). Growth was significantly influenced by the duration of infection with the two CSSV mild strains. Slicing analyses showed no significant differences in stem circumference among treatments up to the third year of field data collection. However, from the fourth to the seventh year, growth of N1-inoculated cacao plants was significantly higher than that of SS365B-inoculated plants. Overall, growth did not differ significantly between cacao plants inoculated with mild strain and the non-inoculated plants. Contrary to some previous reports, yield of mild strain-inoculated cacao plants was significantly lower than that of the non-inoculated plants. Polymerase chain reaction was used to detect the presence of CSSV in randomly selected field samples. The implications of these results (based on field data collected from 2008 to 2014) in the management of cocoa swollen shoot virus disease in Ghana are discussed.

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Acknowledgements

The authors are grateful to Kai Johnson (of blessed memory), Henry Oboom, Mawuli Adoblanui, Bright Klu Quarshie and Ben Amo (all of CRIG) for providing technical support. The authors are also grateful to Mr. Curt Doetkott, a consulting statistician at the Information Technology Services, North Dakota State University, for analyzing the data. We also acknowledge the contribution of Dr. Frank Owusu-Ansah (Social Science and Statistics Unit, CRIG) in experimental design and data management. Funding for this work was provided by CRIG. This manuscript (CRIG/05/2017/040/003) is published with the kind permission of the Executive Director of CRIG.

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  1. Cocoa Research Institute of Ghana, P.O. Box 8, New Tafo-Akim, Eastern Region, Ghana

    O. Domfeh, G. A. Ameyaw & H. K. Dzahini-Obiatey

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  1. O. Domfeh
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  2. G. A. Ameyaw
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  3. H. K. Dzahini-Obiatey
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Correspondence to O. Domfeh.

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Domfeh, O., Ameyaw, G.A. & Dzahini-Obiatey, H.K. The effects of mild cacao swollen shoot virus strains N1 and SS365B on growth and yield of cacao. J Gen Plant Pathol 84, 369–375 (2018). https://doi.org/10.1007/s10327-018-0794-3

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