Seasonal abundance and host range of Tomato leaf miner Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) in Khartoum, Gezira and Kassala States of the Sudan

Mohammed A.M. Elhaj, Azhari O. Abdelbagi, Mahdi A. Ahmed, Mohammed E.E. Mahmoud

Abstract


Seasonal abundance and host range of tomato leaf miner Tuta absoluta was studied in eight locations distributed in three States of Sudan (Khartoum, Gezira, and Kassala States). Pest survey was done by pheromone (3E, 8Z, 11Z tetradecatrien-1y-l acetate) traps and characteristic symptoms of infestation in plants (infestation level). The survey covered the important solanaceous hosts; tomato, potato, egg plant and other crops or weeds. The results showed presence of the pest in all location surveyed. The number of infested plants closely matches the traps catches. The highest number of catches and the highest infestation was found on tomato followed by potato, egg plant and alfalfa Medicago sativa. The pest was reported for the first time on alfalfa and gubbain Solanum dubium. Traps placed in the up wind direction scored the highest catches. Generally the number of adult caught and infestation level increased from mid towards the end of the winter season on tomato and potato while in alfalfa the catches decrease toward the end of the winter season. The highest infestation was found in Gezira State followed by Kassala State and least in Khartoum State. The number of catches positively correlated with the increase in temperature and negatively correlated with the relative humidity although effects on the latter were non significant. Further lines of research were suggested. 


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