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Field surveys of pearl millet downy mildew - effects of hybrids, fungicides and cropping sequence

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Relation http://oar.icrisat.org/1397/
 
Title Field surveys of pearl millet downy mildew - effects of hybrids, fungicides and cropping sequence
 
Creator Thakur, R P
Rao, V P
Amruthesh, K N
Shetty, H S
Datar, V V
 
Subject Millets
 
Description Pathogenic and genetic diversity in Sclerospora graminicola, the pearl millet downy mildew pathogen, is a major cause of a reduced effective life of commercial FJ hybrid cultivars in India. We conducted surveys during 1994-2000 of pearl millet crops in farmers' fields in Maharashtra, the state that has the largest area (ca. I million ha) under hybrids, to assess the incidence of downy mildew in hybrids. Results indicated: i) a rapid increase in the number of hybrids grown in the region, from 3.in 1994 to 26 in 2000, with the majority of seeds produced arid marketed by commercial seed companies; ii) a new resistant hybrid when grown consecutively in the same field for more than three crop seasons often became susceptible to, downy mildew (with up to 100% incidence) indicating the emergence/selection of new virulence; Hi) seed treatment with the systemic fungicide- metalaxyl was not always effective in significant reduction of liowny mildew incidence and of oospore production in some hybrids~ and iv) cropping sequences, where previous crops were cotton, coriander and onion, had significantly lower downy mildew incidence compared with other crops.
 
Date 2003
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/1397/1/JMycolPlPathol33_3_387-394_2003.pdf
Thakur, R P and Rao, V P and Amruthesh, K N and Shetty, H S and Datar, V V (2003) Field surveys of pearl millet downy mildew - effects of hybrids, fungicides and cropping sequence. Journal of Mycology and Plant Pathology, 33 (3). pp. 387-394.