Isolation and pathogenicity of the causal fungus of black scorch disease in Sudanese date palm
2008
Irabi, A.I., University of Upper Nile, Elrunk (Sudan). Faculty of Agriculture | El-Hassan, S.M., University of Khartoum, Shambat (Sudan). Faculty of Agriculture, Dept. of Crop Protection | Dawoud, D.H., Agricultural Research Corporation, Khartoum (Sudan). Head of Shambat Research Station
This study reports the natural occurrence of black scorch disease in date palm (Phoenix dactylifera L.) in Khartoum and River Nile States. It also aims at establishing the identity and pathogen city of the causal organism. The symptoms consisted of black scorch on fronds, inflorescence blight, trunk rot and terminal bud rot leading to a characteristic bend at the region of infection (Medjnoon phenomenon). Based on the typical visual symptoms, the disease incidence was estimated at 2% - 4% in Khartoum State and 6% - 10% in the River Nile State. The fungus, isolated from typical disease lesions, was identified as Thielaviopsis paradoxa (de Seynes) Von Hohn. depending on its cultural and morphological characteristics, showing two types of vegetative spores (micro conidia and macro conidia). This was further confirmed by the pathogen city test of the isolated fungus which produced the commonly known pineapple disease symptoms in sugarcane setts. This is the first confirmation of the occurrence of black scorch disease on date palm in Sudan, based on the identity and pathogen city of the causal agent. Previous reports on the occurrence of this disease in Sudan, however, relied only on visual symptoms
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