In a survey of farmers’ fields across four states of South western Nigeria, major diseases of egusi melon were evaluated and symptoms described. Pathogenicity tests of foliage and fruits were conducted in the laboratory and causal pathogens identified. Powdery mildew (Erysiphe cucurbitarum) appeared as round whitish spots on the lower surface which increased in size and later appeared as whitish talcum on the upper surface. Downy mildew (Peronospora cucurbitarum) appeared on the upper surface as small and pale green to yellow angular spot which became chlorotic and shriveled. Alternaria leaf spot (Alternaria cucumerina) appeared as small circular water soaked areas which turned dark brown to black and Cercospora leaf spot (Cercospora citrullina) appeared as circular spot with white to tan centres having dark margins. Foliar spots which began as small yellowish water- soaked areas on the veins that later turned circular, dried up, broke and became shattered were symptoms observed for the Anthracnose disease (Colletotrichum lagenarium). Fruit anthracnose started as small, circular, black, sunken canker with raised margin. Leaf blight, stem blight and fruit rot (Didymella bryoaniae) disease symptoms were observed on leaves, stems and fruits respectively. Leaf symptoms began as light brown, irregular spots surrounded by yellow borders that developed from the tip of the leaves and gradually progressed backwards. Brown lesions were observed on the stem which split open and turned dark. Lesions observed on fruits appeared as small, almost circular water- soaked areas, which enlarged, resulting in dark, firm and leathery depressed areas. Symptoms of vine wilt were observed as elongated brown lesions which developed on stems near the crown which extended as long, narrow, brown streaks causing stem to completely wilt. Wet rot of flower and fruit (Choanephora cucurbitarum) appeared as characteristic fungus growth resembling numerous pins stuck in a pin-cushion on the infected surface. The study will help to bridge the gap of information on the characteristic symptoms and causal pathogens of melon diseases in South Western Nigeria



“Egusi” melon, South western, Field diseases, Symptoms

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Adebanjo, A. 1990. An inflorescence disease of Amaranthus spp in Nigeria associated with Choanephora cucurbitarum J of phytopathology, 128 (2): 146-152.

Adewusi, H.G., Ladipo, D.O., Sarumi, M.B., Vodouhe, R. 2000. Egusi production, utilization and diversity in Nigeria. In: Agronomy in Nigeria. Polygraphics venture Ltd, Ibadan. pp 94 - 100.

Ajibola, O.O., Eniyemo, S.E., Fashina, O.O., Adeeko, K.A. 1990. Mechanical expression and oil from melon seeds. J. Agric. Engineering Res., 45: 45 - 53.

Asoegwu, S.N. 1987. Tillage effects of egusi melon (Coloncynthis citrullus L.) production in Nigeria. Proc. of the 12th Annual conf. Hort. Soc. pp84 – 91.

Babadoost, M. 1989. Alternaria leaf spot or blight of cucurbits, University of Illinois extension report on plant disease. RPD no 918. 3pp

Barnett, H.L., Hunter B.B. 1988. Illustrated Genera of Imperfect Fungi. Burgress Publishing Co., Minneapolis, USA. p218.

Burkill, H.M. 1985. The useful plants of West Tropical Africa. Vol.1 Families A-D. Royal botanical Garden, Kew. p960.

Buzi, A., Chilosi, G., Magro, P. 2002. Principal diseases afflicting melons. Colture-protette, 31(9): 31-45.

Choi, Y., Choi, J.N., Choi, C.D., Shammar, P.K, Lee, W.H. 2010. Identification and characterization of the causal organism of gummy stem blight in the muskmelon (Cucumis melo L.). Mycobiology, 38(3): 166-170.

Cobley, L.S. 1979. An introduction to the botany of tropical crops 2nd edition, Longmans, Green and Co. Ltd. London. p357.

Colucci, S.J., Holmes, G.J. 2010. (Downy mildew of cucurbits http://www.apsnet.org/edcenter/intropp/lessons/fungi/Oomycetes/Pages/Cucurbits.aspx January 21, 2010

Denton, O.A, Olufolaji, A.O. 2000. Nigeria’s most important vegetable crops. In Agronomy in Nigeria. Polygraphics venture Ltd. Ibadan. pp32.

Fayemi, P.O. 1999. Local extraction of melon oil (Nigerian vegetable). Heinemann Educational Books PLC Ibadan, Nigeria. pp138 - 139.

Ferrin, D.M. 2008. Foliar diseases of water melon. Louisiana Plant Pathology disease identification and management series. http/ www.lsuagcenter.lsu.edu

Retrieved February 10, 2010

Hill, D.S., Waller, J.M. 1999. Pest and diseases of tropical crops. Vol. 2. Field handbook. Pearson Education Ltd. England. pp172 – 178.

Jun, T., Hiromichi, H. 2000. Choanephora blight of common garden petunia caused by Choanephora cucurbitarium. Annals of Phytopathological Society of Japan, 66(2): 72-77

Kenaga, C.B., Williams, E.B., Green, R.J. 1971. Plant Disease syllabus. Bali Publishers Lafayette, Indiana. pp3-13.

Lucas, B.G., Campbell, C.L., Lucas, L. T. 1992. Introduction to Plant diseases: Identification and Management (2nd Edition. An AVI Book, Chapman and Hall, an International Thompson Publishing Company, New York. pp204-240.

McGrath, M.C. 1997 Powdery mildew of cucurbits Cornell fact sheet http://vegetablemdonline.ppath.cornell.edu/factsheets/Cucurbits_PM.htm January 21, 2010

Miller, S.A., Rowe, R.C., Riedel, R.M. 2009. Gummy stem blight and black rots of cucurbits Ohio state University extension facts sheet HYG 3126-96 ohioonline.osu.edu/hyg-fact 3000/3126.html.

Musoni, A., Kimani, P., Narla, R.D, Buruchara, R., Kelly, J. 2010. Inheritance of fusarium wilt (Fusarium oxysporum f. sp phaseoli) resistance in climbing beans. African J. of Agricultural research, 5(5): 399- 404.

Nwokolo, E., Sim, J.S. 1987. Nutritional assessment of defatted oil seed meal of melon (Colocynthis citrullus) and fluted pumpkin (Telfara occidentales). J. Sci. Fd. Agric., 38: 237 - 246.

Oyolu, C. 1977. A quantitative and qualitative study of seed types in egusi (Coloncynthis citrullus L.). Trop. Sci. 19: 55 - 62.

Park, S.D., Kwon, T.Y., Lim, Y.S., Jung, K., Choic, B.S. 1996. Disease survey in melon, water-melon and cucumber with different successive cropping under viny/house conditions. Korean J. of Plant pathology, 12(4): 428 - 431.

Peregrine, W.T.H., Ahmad, K., Momin, M. 1984. Controlling anthracnose in water melon. World Crops. 36(5): 184 - 185.

Prakash, O., Sohi, H.S., Sokhi, S.S. 1974. Studies on anthracnose disease of cucurbits caused by Colletotrichum lagenarium (Pass) E11. 1 Halst. and their control. Indian J. of Horticulture, 31(3): 278 - 282.

Rego, A.M. 1994 Disease caused by fungi on cucurbitaceae. Informe–Agroprecuario – Belo-Horizonte. 17(182): 48-54.

Roberts, P., Kucharek, T. 2004. Florida Plant Disease Management guide: Squash. IFAS extension. University of Florida. pp5

Siddiqui, Y., Meon, S., Ismail, M.R., Rahmani, M. 2009. Bio potential of compost tea from agro waste to suppress Choanephora cucurbitarum L. the causal pathogen of wet rot of okra. Biological Control, 49(1): 38-44

Timchenko, V.I. 1977. Diseases of melons. Zashcita-Rastenii. 10: 62.

Tindal, H.D. 1983. Vegetables in the tropics. ELBS Macmillan, Hong Kong. pp194 – 195.

Wei, S.Q., Zhong, Y., Ma, Z.T., Jiang, H. 1991. A survey on water melon diseases in the Northern China. Chain Fruits, 1: 36 - 37.

Williams, P.H. 2003. Cucurbit breeding: Horticultural Science. NC State and USDA cucumber diseases handbook. http://cuke.hort.nesu.edu/cucurbit/cuke/dshnbe/dm.html Retrieved January 12, 2010.

Wydra, K., Msikita, W. 1998. An overview of the present situation of cassava diseases in West Africa in Akoroda, M. O. and Ekanayake, I. J.(eds.) Root crops for poverty alleviation. Proceedings of the sixth triennial symposium of the International Society for Tropical Root Crops (ISTRC), Lilongwe, Malawi 22-28 October, 1995 ISTRC (International Society for Tropical Root Crops), IITA (International Institute of Tropical Agriculture) and Government of Malawi pp163-166


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