Browsing by Author "Olanya, O.M."
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Item Fungicide application and host-resistance for potato late blight management: benefits assessment from on-farm studies in S.W. Uganda(Crop Protection, 2004) Namanda, S.; Olanya, O.M.; Adipala, E.; Hakiza, J.J.; El-Bedewy, R.; Baghsarif, A.S.; Ewell, P.Late blight caused by Phytophthora infestans, is one of the most significant constraints to potato production in Uganda and other regions of the world. Fungicides and host plant resistance are among the most efficient control options available to growers. Field trials were conducted in 1999 and 2000 in South-western Uganda to evaluate the cost effectiveness of fungicide application regimes on six potato varieties. A factorial experiment with five fungicide application intervals (weekly, fortnightly, IPM, no spray and farmers’ practice) and six potato varieties was established. Late blight infection was prevalent in both years, and a significant amount of disease was detected (P<0.05). Application of fungicide treatments considerably reduced late blight progress, with a corresponding increase in tuber yield. Based on monitoring of late blight disease occurrence and weather variables, two applications of the contact fungicide mancozeb on a moderately resistant variety was the most economical. Marginal rates of return and net benefits were significantly affected by fungicide applications. In the IPM treatment, late blight disease monitoring or scouting prior to first fungicide applications resulted in significant economic gains compared to scheduled applications of weekly and biweekly or no application (control) treatments.Item Potato Production in the Tropical Highlands: Constraints, Fungicide Use and The Impact of IPM Strategies(Outlooks on Pest Management, 2004) Olanya, O.M.; Hakiza, J.J.; Crissman, C.C.Potato (Solanum tuberosum) is an important cash and food crop in various tropical highlands of Africa, Asia and Latin America. Potato production in the tropical regions of the world is quite diverse involving ecological, cultural and economic considerations. The total production in the tropics is estimated at about 100 million metric tons and per capita consumption is about 20 kg/per person per year. In the tropical highland regions, ambient temperature conditions during the cropping season range from 14 to 25 C. The rainfall received during the cropping seasons is often adequate (> 1,200 mm/annum). Potato production (total acreage & yield) and consumption is increasing in the tropical highlands. The majority of potato production in the tropical regions of the world is however, found in the IndoGangetic plains and southern China where growing conditions, IPM techniques and other practices are very different from the tropical highlands of Africa and Latin America.