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Distribution, economic injury level and sequential sampling of leaf folder (Cnaphaiocrosis medinalis) on rice (Oryza sativa)

Indian Agricultural Research Journals

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Title Distribution, economic injury level and sequential sampling of leaf folder (Cnaphaiocrosis medinalis) on rice (Oryza sativa)
 
Creator CHANDER, SUBHASH
SINGH, VIDYA SAGAR
 
Subject Rice, Oryza sativa, Leaf folder, Cnaphalocrosis medinalis, Spatial distribution, Economic injury level, Sequential sampling
 
Description An experiment was conducted during the rainy season of 1997 and 1998 to study the spatial distribution of leaf folder(Cnaphalocrosis medinalis Guenee) on rice (Oryza sativa L.) in terms of its damage using Taylor's power law. The vahlesof aggregation parameter (b*) < 1.0 indicated regular distribution of the pest on the crop. Linear regression model for yield infestation relationship was found to be y = 91.8182-1.0434 X (R2 = 0.58) any  100.1869-0.5036 X (R2= 0.88) during 2 years. Based on gain threshold of 0.39 tonne/ha and regression coefficient of yield-infestation model, economicinjury level was determined as 4 % folded leaves during the first year and 8 % folded leaves during the second year atpanicle-emergence stage of the crop. Sequential sampling plan was formulated using distribution parameters, economicinjury level and error probability of 20 %.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2014-05-08
 
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/40511
 
Source The Indian Journal of Agricultural Sciences; Vol 71, No 12 (2001)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/40511/18151
 
Rights Copyright (c) 2014 The Indian Journal of Agricultural Sciences