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Integrated management of stalk rot disease (Sclerotinia sclerotiorum) of cauliflower in the eastern hills of Nepal

Integrated management of stalk rot disease (Sclerotinia sclerotiorum) of cauliflower in the eastern hills of Nepal

Duwadi, Vrigu Rishi (1999) Integrated management of stalk rot disease (Sclerotinia sclerotiorum) of cauliflower in the eastern hills of Nepal. PhD thesis, University of Greenwich.

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Abstract

Cauliflower is a high value cash crop for the resource-poor farmer of the eastern hills of Nepal. Non-governmental organisations are enabling resource-poor farming communities to gain a better share in economic development by facilitating input supply and helping to explore market facilities. Previous work indicated that stalk rot (Sclerotinia sclerotiorum) is an important disease of cauliflower. Currently, no single management technique provides a satisfactory level of control of stalk rot disease; therefore the management of stalk rot had to be approached in several ways in order to develop the basis for an integrated management strategy.

Surveys of farmers' experience and the results of investigative work indicated that stalk rot (S. sclerotiorum) and damping-off (S. sclerotiorum., Alternaria spp., Pythium sp., Rhizoctonia spp. andFusarium spp.) are major constraints for satisfactory cauliflower production. Stalk rot is problematic for all stages of the crops. Seeds used by the farmers did not meet an acceptable standard of germination. Experimental data indicated that S. sclerotiorum and Fusarium spp. are major fungal pathogens associated with poor germination and seedling mortality after emergence. In the case of S. sclerotiorum, it is likely that sclerotial contamination of seed is the source of these problems.

Farmers are generally aware of cultural practices to manage disease problems, but lack awareness of correct methods of disposal and alternative use of diseased debris. Studies on the effect of weeds on cauliflower production did not support farmers' perceptions that weeds reduce the disease incidence in the fields. Weeds did reduce curd size and yield presumably due to competition with crop plants. Some fungal antagonists of S. sclerotiorum, particularly a Trichoderma harzianum, showed promising activity but further work is necessary to translate the results on detached curds into a practical technique. Source of resistance to S. sclerotiorum were found in cv. Kathmandu Local that could be exploited in breeding varieties of cauliflower acceptable to farmers. The results are used to develop a strategy for integrated management of cauliflower diseases that could be adopted by agricultural scientists, extension workers, NGOs and farmers.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Cauliflower; pest management; cauliflower disease management; Nepal
Subjects: S Agriculture > SB Plant culture
Pre-2014 Departments: School of Science > Natural Resources Institute
School of Science > Natural Resources Institute > Natural Resources Department > Pest Management Department
Last Modified: 25 Apr 2019 11:00
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/23712

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