Abstract
Alternaria brown spot disease caused by the Alternaria alternata pv. citri factor affects the leaves, branches and fruits of many types of tangerines and their hybrids. This disease has caused serious declines in the plantation areas of Minneola tangelo which is widely produced in the Mediterranean Region while at the same time it has hindered the expansion of the area of cultivation of late maturing tangerines like Fortune. The isolate used in this study was obtained from a commercial orchard of ‘Minneola tangelo’ in the province of Adana, Turkey. The sequence analysis of the application of this isolates shows that a matchup of 99% was achieved with isolate AHS-467.6 on the scale of the IFS primer. The aim of the study was to identify tolerant genotypes from the mutants bred form the ‘Fortune’ tangerine which is known to be sensitive to the brown spot disease of citrus. The sensitivity of individual mutants was tested by using leaves under in vitro conditions. The disease was inoculated to tolerant mutant varieties under in vivo conditions and the results registered. The results of the study showed that 9 mutant varieties among the 110 individuals under study were found to be tolerant against the disease.
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