Management of black scurf (Rhizoctoni solani) of
potato (Solarium tuberosuin L.) through determining level of susceptibility in
various breeding lines/cultivars of potato and tuber treatment with various
fungicides was investigated by using R. solaniAG-3 isolate CL-58 (a known
aggressive). Greenhouse screening of fifteen potato breeding lines and cultivars
for host plant resistance to isolate CL-58 by soil inoculation revealed potato
cvs. Cardinal and Desiree, resistant and susceptible, respectively. Management
of disease by using susceptible cv. Desiree through potato tuber treatment with
fungicides viz., Dithane M-45, pencycuron and Benlate and then sowing
them in potting mixture previously inoculated with inoculum of the fungus
revealed Dithane M-45, a promising fungicide for management of this disease. It
significantly checked eyes germination inhibition and decreased sprout killing,
stem girdling, stem canker, black scurf incidence and severity over non-treated
inoculated control. Based upon the results achieved, it is necessary to adopt
this practice as seed treatment of chemicals is not a regular exercise in
Pakistan. This in-turn will protect potato crop from seed-borne infection and
will ultimately lead to better and healthy crop stand.
Yangzhou pioneer chemical CO.,LTD.
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