PJB-2003-48
NATURAL OCCURRENCE OF TOBACCO STREAK VIRUS IN COTTON IN PAKISTAN AND SCREENING FOR ITS RESISTANT SOURCES
WAQAR AHMED*, TAHIR BASIT BUTT, JAVED IHSAN AND ABDUL REHMAN
Abstract
During 1994, a cotton mosaic disease was observed on the leaves of cotton plants at several locations in cotton growing areas of the Punjab. Infected leaves were showing typical symptoms of mosaic. Twenty six different cotton varieties belonging to the Gossypium hirsutum group were screened against cotton mosaic under the natural infection conditions in different ecological zones. Among these, cotton varieties CIM-70, S-12, B-622, B-30, B-496, BH-4, BH-89, BH-94, BH-95, and Krishma showed resistance to mosaic but these were highly susceptible to cotton leaf curl virus (CLCuV). None of the cotton varieties tested was resistant to both CLCuV and Tobacco Streak Virus (TSV). Based on ELISA, TSV was detected in samples showing mosaic symptoms. TSV was readily graft transmissible but not transmissible by mechanical means. No evidence of its transmission through seeds or by thrips was obtained.
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