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Dieback of cocoa (Theobroma cacao L.) plant tissues caused by the brown cocoa mirid Sahlbergella singularis Haglund (Hemiptera: Miridae) and associated pathogenic fungi

Published online by Cambridge University Press:  30 July 2015

Joseph Chuks Anikwe  and
Henry Azuka Otuonye
Joseph Chuks Anikwe*
Affiliation:
Department of Zoology, Faculty of Science, University of Lagos, Akoka, Lagos, Nigeria
Henry Azuka Otuonye
Affiliation:
Pathology Section, Cocoa Research Institute of Nigeria, Idi-Ayunre, Ibadan, Oyo State, Nigeria
*
*E-mail: jachuks@yahoo.com
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Abstract

The brown cocoa mirid, Sahlbergella singularis is the most important insect pest of cocoa for field damage has been classified into three categories that include blast, stagheadedness and mirid pocket. The mirid attack predisposes the cocoa plant to secondary infection by opportunistic pathogenic fungi. This study evaluated the dieback conditions associated with mirid damage due to associated fungi from lesions on pods, twigs and pin punctures. The relationship between Phytophthora black pod infection and mirid infestation in the field was also established. The results indicated that dieback progression from the mirid lesions (8.5 mm) was significantly different (P< 0.05) from that of pin punctures (7.8 mm). Lasiodiplodia theobromae had the highest proportion of isolates from pods (33%), twigs (47%), and pin punctures (38%). Fusarium decemcellulare (Albonectria rigidiuscula) accounted for 27.8% and 31.6% from pods and twigs; however, it was not recovered from pin punctures. Other isolated pathogens were Aspergillus species and Rhizoctonia species. There was a significantly strong positive correlation coefficient of 0.74 between the mirid population and the black pod disease infection in the field. The major fruit-bearing season of cocoa witnessed an increase in mirid infestation and blackpod infection. The effect of mirid–pathogenic fungi-associated damage could be ameliorated through effective crop husbandry practices to ensure that cocoa plant tissues are not unduly exposed to biological and mechanical injuries.

Keywords

Sahlbergella singulariscocoadiebackAlbonectria rigidiusculapathogenic fungiblack pod
Type
Research Papers
Information
International Journal of Tropical Insect Science , Volume 35 , Issue 4 , December 2015 , pp. 193 - 200
Copyright
Copyright © ICIPE 2015 

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References

Anikwe, J. C., Omoloye, A. A., Aikpokpodion, P. O., Okelana, F. A. and Eskes, A. B. (2009) Evaluation of resistance in selected cocoa genotypes to the brown cocoa mirid, Sahlbergella singularis Haglund in Nigeria. Crop Protection 28, 350–355.Google Scholar
Anikwe, J. C., Omoloye, A. A. and Okelana, F. A. (2010) The population dynamics of the brown cocoa mirid, Sahlbergella singularis Haglund in Ibadan, Nigeria. African Journal of Food Agriculture Nutrition and Development 10, 2772–2783.Google Scholar
Arnold, A. E. and Herre, E. A. (2003) Canopy cover and leaf age affect colonization by tropical endophytes: ecological pattern and process in Theobroma cacao (Malvaceae). Mycologia 95, 388–398.Google Scholar
Arnold, A. E., Mejía, L. C., Kyllo, D., Rojas, E. I., Maynard, Z., Robbins, N. and Herre, E. A. (2003) Fungal endophytes limit pathogen damage in a tropical tree. Proceedings of the National Academy of Sciences of the United States of America 100, 15649–15654.Google Scholar
Babin, R., Anikwe, J. C., Dibog, L. and Lumaret, P. (2011) Effects of cocoa tree phenology and canopy microclimate on the performance of the mirid bug Sahlbergella singularis. Entomologia Experimentalis et Applicata 141, 25–34.Google Scholar
Barnett, H. L. and Hunter, B. B. (1998) Illustrated Genera of the Imperfect Fungi, 4th ed.APS Press, St Paul, Minnesota. 218 pp.Google Scholar
Boyogueno, B. A. D. (2010) Characterization of Botryospheariceae and Cryphonectriaceae associated with Terminalia spp. in Africa. PhD thesis, University of Pretoria, South Africa, 270 pp..Google Scholar
Crowdy, S. H. (1947) Observations on the pathogenicity of Calonectria rigidiuscula (Berk. and Br.) Sacc. on Theobroma cacao L. Annals of Applied Biology 34, 45–59.Google Scholar
Entwistle, P. F. (1972) Pests of Cocoa. Longman, Tropical Science Series, London. 779 pp.Google Scholar
Holliday, P. (1980) Fungus Diseases of Tropical Crops. Dover Publications Inc, New York. 54–55.Google Scholar
Idowu, O. L. (1989) Control of economic Insect pests of cocoa, pp. 152–165. In Progress in Tree Crop Research, 2nd edn. (edited by 25th anniversary editorial team). CRIN, Ibadan.Google Scholar
N'Guessan, K. F., Kébé, I. B., Tahi, G. M. and Eskes, A. B. (2011) Progress obtained in Côte d'Ivoire on mirid resistance studies, pp. 152–167. In Collaborative and Participatory Approaches to Cocoa Variety Improvement. Final report of the CFC/ICCO/Bioversity Project on ‘Cocoa Productivity and Quality Improvement: a Participatory Approach 2004–2010 (edited by Eskes, A. B.). CFC/ICCO/Bioversity International, Amsterdam/London/Rome.Google Scholar
N'Guessan, K. F., Lachenaud, Ph. and Eskes, A. B. (2010) Antixenosis as a mechanism of cocoa resistance to the cocoa mirid. Sahlbergella singularis (Hemiptera: Miridae). Journal of Applied Biosciences 36, 2332–2339.Google Scholar
Ojelade, K. T. M., Anikwe, J. C. and Idowu, O. L. (2005) Comparative evaluation of the miridicidal efficacy of some insecticides for the control of the brown cocoa mirid, Sahlbergella singularis, in Nigeria. Applied Tropical Agriculture 10, 46–53.Google Scholar
Okaisabor, E. K. (1974) Phytophthora pod rot infections from soil, pp. 161–168. In Phytophthora Diseases of Cocoa (edited by Gregory, P. H.). Longman, London.Google Scholar
Opeke, L. K. (1992) Tropical Tree Crops, pp. 95–96. Spectrum Books, Ibadan.Google Scholar
Opoku, I. Y., Appiah, A. A., Akrofi, A. Y. and Owusu, G. K. (2000) Phytophthora megakarya: a potential threat to the cocoa industry in Ghana. Ghana Journal of Agricultural Science 33, 237–248.CrossRefGoogle Scholar
Opoku, I. Y., Assuah, M. K. and Aneani, F. (2007) Management of black pod disease of cocoa with reduced number of fungicide application and crop sanitation. African Journal of Agricultural Research 2, 601–604.Google Scholar
Padi, B. (1997) Prospects for the control of cocoa capsids – alternatives to chemical control, pp. 28–36. In Proceedings of the 1st International Cocoa Pests and Diseases Seminar, 6–10 November, 1995, Accra, Ghana.Google Scholar
Padi, B., Ackonor, J. B. and Opeku, I. Y. (2001) Cocoa IPM implementation in Ghana, pp. 54–62. In Proceedings of West African Cocoa IPM Workshop, 13–15 November 2001, Cotonou, Benin.Google Scholar
Rayner, R. W. (1970) Mycological Colour Chart. Commonwealth Mycological Institute and British Mycological Society, Kew, Surrey. 34 pp.Google Scholar
Rossman, A. Y., Samuels, G. J., Rogerson, C. T. and Lowen, R. (1999) Genera of Bionectriaceae, Hypocreaceae, and Nectriaceae (Hypocreales, Ascomycetes). Studies in Mycology 42, 1–248.Google Scholar
Taylor, B. and Griffin, M. J. (1981) The role and relative importance of different ant species in the dissemination of black pod disease of cocoa, pp. 114–131. In Epidemiology of Phytophthora on cocoa in Nigeria. Commonwealth Mycological Institute, Kew.Google Scholar
Williams, G. (1953) Field observations on the cacao mirids, Sahlbergella singularis Hagl. and Distantiella theobroma (Dist.), in the Gold Coast. Bulletin of Entomological Research 44, 101–119.Google Scholar