Factors affecting infection by Peronosclerospora sorghi on sorghum

Shekara Shetty, H. ; Safeeulla, K. M. (1981) Factors affecting infection by Peronosclerospora sorghi on sorghum Proceedings of the Indian Academy of Sciences - Plant Sciences, 90 (5). pp. 465-470. ISSN 0253-410X

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Official URL: http://www.ias.ac.in/j_archive/procb/90/vol90conte...

Related URL: http://dx.doi.org/10.1007/BF03052945


Age of sorghum plants is important in the development of downy mildew disease incited by Peronosclerospora sorghi. Plants inoculated just after emergence and up to 4-5 leaf stage are highly susceptible. In plants inoculated after 6-7 leaf stage, systemic symptoms were not observed but only local lesions appeared. Conidial concentration of 40/seedling brings about 100% infection if the host seedlings are inoculated through root. Systemic infection occurs in 10 and 22 days depending upon the conidial concentration. Roots of the seedlings inoculated with 1000 conidia/seedling get infected earlier. Mature conidia are highly infective compared to immature or old conidia. Soil and seed-borne inoculum can initiate both systemic and local lesion type of symptoms at any growth stage of the host plant in addition to air-borne conidia. Late expression of systemic infection can result both from air-borne conidia and oospore present in the soil or seed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Factors; Infection; Peronosclerospora sorghi; Age of Host Plant; Inoculum Density; Conidial Maturity; Sorghum; Maize
ID Code:46687
Deposited On:06 Jul 2011 07:02
Last Modified:06 Jul 2011 07:02

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