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SCREENING OF CITRUS CULTIVARS FOR SOURCE OF RESISTANCE AGAINST CITRUS CANKER UNDER FIELD CONDITIONS

MUHAMMAD BURHAN^*, S.T. SAHI^** AND S. AHMAD^***

Abstract: Twenty six citrus cultivars were screened for resistance against citrus canker under artificial disease conditions in the field of Orange Research Institute, Sargodha during 2006. A considerable variation was observed among the cultivars with respect to their disease reaction.  Disease rating scale ranged from 0-4 to know the level of resistant and susceptibility of citrus cultivars. Two cultivars Meiwa and Naghmi had no lesions on leaves and categorized as immune while Kozan and Tahiti lime had minute infection were highly resistant. Four cultivars viz; Valencia late, Olinda Valencia, Musambi and Honey were rated as moderately susceptible whereas Pummelo white, Shamber grapefruit and Rough lemon were found susceptible. Other fifteen varieties behaved as resistant.

^*Arid Zone Research Institute, Bhakhar, Pakistan.

^**Orange Research Institute, Sargodha, Pakistan

^***Department of Plant Pathology University of Agriculture, Faisalabad, Pakistan