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Sensitivity Of Some Potato Cultivars To Late Blight Disease, Effect Of
Nitrogen Fertilization And Its Chemical Control.
Mohamed M. Baraka (1), Fauzi A. Bisheya (2)
S.M. Garew (2) and Azi-Deen N. Fahema
(3).
(1) Faculty of Agriculture, Al-Fetah
University, Tripoli, Libya.
(2) Agriculture Research Center,
Tripoli, Libya. E-mail: Bisheya@yahoo.com
(3) Agriculture
Marketing Company, P.O. Box 2480, Tripoli, Libya.
Abstract
Potato late blight is an important economic disease in libyan Jamahirya.
Disease susceptibility of four highly productive potato cultivars: Oblex,
Spunta, Concord, and Barka was studied in three locations in the western region
of Great Jamahirya: Ben-Gasher, Jadeda, and Ain-Zara. Spunta and Concord were
highly susceptible, Oblex was moderate, and Baraka, a late maturing variety, was
resistant. Eight fertilizations rates of ammonium sulfate, from 50 kg untill 350
kg/ha decreased late blight fungal infections and increased total and marketable
production. Concord was highly susceptible in all fertilization rates compared
to Lizeta and Ajax. Infection rate of Lizata and Ajax was 30.47 and 34.63%,
respectively. Lizeta had the lowest infection rate of 16.25 % at a fertilization
rate of 150 kg/ha. This fertilization rate led to an increase of total
production of 28.28, 29.48 and 22.32 ton/ha, and marketable production of 27.39,
27.30, and 19.84 ton/ha for Lizeta, Ajax, and Concord, respectively. Results of
this study support the selection of less susceptible potato cultivar (Lizeta) to
late blight. Fertilization rate of 150 kg/ha will increase total and marketable
production and the use of specific fungicides will lower late blight infection.
Galben was significantly better than the other fungicides, Previcur-N, Sandofan,
and Ridomil MZ used, and all three fungicides were better than the control in
lowering disease percentage for two seasons. This will help in designing a
successful control program for the disease.
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