Influence of temperature and high humidity duration on smut infection in pearl millet

Thakur, R P (1990) Influence of temperature and high humidity duration on smut infection in pearl millet. Plant Disease Research, 5 (2). pp. 157-164. ISSN 0970-4914

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Panicles of Pennisetum americanum inoculated with Tolyposporium penicillariae maintained at a high RH (>95%) when exposed to post-inoculation temp. of <20°C for 8 h and >30°C for 3.5 h/day (range 15-32°) were not infected; those exposed to <20° for O h and >30° for 7.7 h day-1 (range 20-38°) developed 30% infected florets; and those exposed to <20° for 0 h and >30° for 5.4 h/day (range 26-33°) had 76% smutted florets. Of the temp. tested, min. temp. inhibited smut infection more than max. temp. With decreasing post-inoculation exposure time from 6.7 to O h/day at <20° there was a significant reduction in latent period from 23 to 11 d. Smut inoculated panicles exposed to high RH for 168-192 h produced max. infection (>50%). These results indicate that high RH periods of 168-192 h and a daily mean air temp. of c. 30° (range 25-35°) may be most favourable for smut infection, and that air temp. <20°, even for a few h/day, greatly reduce smut infection. The implications of these findings in screening P. americanum for smut resistance are discussed

Item Type: Article
Uncontrolled Keywords: Pennisetum glaucum, pearl millet, tolyposporium pennicillariae, smut, high RH duration, temperature, resistance screening, epidemiology
Subjects: Mandate crops > Millets
Depositing User: Ms K Syamalamba
Date Deposited: 03 Nov 2011 05:02
Last Modified: 03 Nov 2011 05:02
Official URL:
Acknowledgement: I thank V.P. Rao, and C.S. Kousik for their help in conducting experiments and data analysis, A.A.H. Khan for his help with electronic equipments, and S.P. Wani, J.R. Witcombe and S.B. King for their critical comments on the manuscript
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