Races of Colletotrichum lindemuthianum (Sacc. & Magnus) Briosi & Cavara in major bean growing regions in Tanzania
Loading...
Date
2020-06
Journal Title
Journal ISSN
Volume Title
Publisher
Academic Journals
Abstract
Breeding for resistant varieties has been shown to be the most suitable method to control bean
anthracnose caused by Colletotrichum lindemuthianum though the method is challenged by the
existence of many races of the pathogen. This work focused on characterizing races of C.
lindemuthianum from potential bean agro ecological zones of Tanzania using a set of differential bean
cultivars. From 144 anthracnose infected bean samples collected, 50 pure isolates were obtained and
characterized whereby 42 races were identified. The most virulent race identified was race 3610 from
the Southern Highland zone of Tanzania while the least virulent was characterized as race 0. Race 2 was
the most widely spread (4.2 %) found in Northern, Southern highland and in Eastern zones of Tanzania.
The work confirms that G2333 can still be used as a potential donor of resistant genes to varieties that
are to be grown in Northern, Eastern and Lake zones but not for the varieties from Southern Highland
2
and Western zones of Tanzania since isolates from these zones overcame resistant genes Co-4 , Co-5,
Co-7 in G2333. 95% of all races which were identified are new and were not specific to either
Mesoamerican or Andean origin common bean.
Description
Keywords
Colletotrichum lindemuthianum, Anthracnose, Races, Resistant genes, Differential cultivars