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Simulating rice stem borer, Scirpophaga incertulas Wlk., damage for developing decision support tools

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Title Simulating rice stem borer, Scirpophaga incertulas Wlk., damage for developing decision support tools
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Creator G. Reji , Subhash Chander, P.K. Aggarwal
 
Subject Infocrop model Damage mechanism Decision support tools Rice stem borer Yield loss simulation a b s t r a c t InfoCrop
 
Description Not Available
InfoCrop, a generic crop–pest simulation model, was used to validate yellow stem borer, Scirpophaga
incertulas Wlk., damage mechanism on two rice cultivars, Pusa Basmati 1 and Ratna. Data sets consisted
of three experiments, one under natural infestation of the pest and two involving artificial detillering.
The simulated yields showed less than 10% variation from the observed yields, except in one treatment,
where the difference was 10.5%. The simulated yield losses were also proximal to respective observed
yield losses (R2 ¼ 0.922, RMSE ¼ 3.825), indicating proper validation of damage mechanism of the stem
borer. As the model simulated the pest damage appropriately under natural injury, as well under
artificial detillering; artificial detillering seemed comparable to natural injury of the stem borer in its
effect on rice growth and yield. Validated InfoCrop was used to simulate economic injury levels (EILs) of
the stem borer at different rice growth stages for varied control expenditure, incurred on two and three
sprays of monocrotophos and one granular application of carbofuran, and for three market prices of
produce. The EIL consistently decreased with advancing crop age and it exhibited a positive relationship
with control expenditure and a negative relationship with market value of the produce. The simulated
EILs were observed to be comparable to empirical injury levels that were previously established. The
validated model was also used to devise iso-loss curves that depicted same yield loss for different
combinations of the stem borer injury and crop age. Crop simulation model-based EILs and iso-loss
curves are useful in monitoring the stem borer injury and in need assessment for pesticide application,
thereby avoiding unnecessary expenditure and environmental contamination. Due to their mechanistic
nature, crop models can be used to formulate location-specific decision support tools and therefore,
help improve decision making in pest management.
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Date 2024-04-22T17:31:01Z
2024-04-22T17:31:01Z
2008-01-01
 
Type Research Paper
 
Identifier Reji, G., Chander, S. and Aggarwal, P.K. 2008. Simulating rice stem borer, Scirpophaga incertulas Wlk., Damage for developing decision support tools. Crop Protection 27: 1194-1199.
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/82291
 
Language English
 
Relation Not Available;
 
Publisher Elsevier