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Epiphytology and losses of downy mildew (Peronospora parasitica) of radish (Raphanus sativus) seed crop

Indian Agricultural Research Journals

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Title Epiphytology and losses of downy mildew (Peronospora parasitica) of radish (Raphanus sativus) seed crop
 
Creator LAKRA, B S
 
Subject Epiphytology, Downy mildew, Peronospora parasitica, Raphanus sativus, Environmental variables
 
Description An experiment was conducted during 1998-99 on the downy mildew to study epidemiology and loss caused by Peronospora parasitica (Pers Fr. on 'Pus a Chetaki' radish (Raphanlls sativus L.) in short-span. Dense crop geometry had positive correlation with diseasc intensity and was deterrent to potential yield. Maximum disease severity (48.6%) found in 30 cm x 30 cm spacing resulted in 30.3% defoliation of leaves and 17.5% bending of twigs. Thc seed yield losses were 17.3,21.7, 24.8,27.1, 34.3 and 39.6% in 60 cm x 60 cm, 60 cm x 45 cm. 45 cm x 45 cm, 60 cm x 30 cm, 45 cm x 30 cm and 30 cm x 30 cm spacings, respectively, compared with their healthy treatments. A steep increase in disease severity was noticed during February when cumulative weekly dew fall was> 1 mm, leaf-wetness duration> 10 hr, favourable temperature duration (8-24°C) > 20 hr and mean maximum relative humidity> 85%. Diseased specks increased greatly when nieto wet and humid conditions were cycled with diurnal favourable temperature (20-24°C) conditions. For downy-mildew epiphytology in radish, leaf-wetness duration and favourable temperature duration were predominant and deciding dependent variablc, while dew fall and mean maximum relative humidity were lauching pads for multicyclic injection.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2014-04-16
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/39800
 
Source The Indian Journal of Agricultural Sciences; Vol 71, No 5 (2001)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/39800/17906
 
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