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THE REACTION AND THE INFLUENCE OF NITROGEN LEVELS ON INCIDENCE AND SEVERITY OF CURVULARIA LEAF SPOT DISEASE ON SUGARCANE (SACCHARUM OFFICINARUM L.)

E. O. SALAWU AND S. S. AFOLABI

Abstract: The reaction of sugarcane hybrids Co.440, Co.1oo1, Co.997, OB5155, CP.36/111, CP.291116, Mex 52/29, B61208, BR.6223, BO.20/58 to Curvularia leaf-spot disease was studied in the Screenhouse. Mex 52/29 and BN61208 were moderately resistant to infection while others were moderately to highly susceptible. Increase in nitrogen levels from 80 to 240 kglha increased the severity of attack. Sugarcane leaf necrotic spots coalesced, turned brown gradually and subsequently died, resulting into significant decrease in shoot weight of sugarcane hybrid Co.1oo1.

Sugar Research Institute, University of Ilorin, P.MB. 1515, Ilorin, Nigeria.