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Safety of insecticidal sprays to spider and predatory coccinellids in varied rice cultivation system

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Title Safety of insecticidal sprays to spider and predatory coccinellids in varied rice cultivation system
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Creator Anitha G, Shashibhushan V, Chitra Shanker, Srinivas C and Uma Devi G
 
Subject Diversity analysis, coccinellids, Kharif Rice
 
Description Not Available
Insect pests and diseases impede the attainment of higher yields by conventional transplantation methods
in rice crop. However, planting methods ence, different planting methods viz., broadcasting and
drumsowing and plant protection methods viz., organic protection practises are gaining popularity in our
country. However, the effect of such planting methods and plant protection practices on various predators
in the field has to be assessed. Since literature on the effect of different planting methods and plant
protection methods on Coccinellid predators is scant, the present study was undertaken to understand the
impact of these methods on the abundance and diversity of Coccinellids. The experiment was laid out in
College Farm, Rajendranagar during kharif 2014-15 and 2015-16 with three main treatments viz.,
Transplanted rice, broadcasted rice and drumsown rice. Under each module, three types of plant
protection measures viz., organic protection, farmers’ practices and “no protection”. Six species of
Coccinellids were recorded during the study, viz., Micraspis, Harmonia, Cheilomenes, Propylea dissecta,
Coccinella and Scymnus. Population of Coccinellids was more in organic protection plots and ‘no
protection’ plots compared to farmers’ practices plots. Similarly, broadcasted plots recorded higher
populations of beetles than transplanted and drumsown plots in general, though interaction effects were
also significant. Diversity study of Coccinellids revealed that species richness was 7 in all the varied
cultivation methods and plant protection practices and it seemed to be least affected by the main
treatment (cultivation type) or the sub-treatment (plant protection practises) followed. Shannon’s species
diversity index however, varied among cultivation techniques and the plant protection practices and it
ranged between 0.91 -1.14 indicating a fairly stable population, though not very stable
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Date 2023-02-15T13:42:31Z
2023-02-15T13:42:31Z
2019-01-01
 
Type Journal
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/76211
 
Language English
 
Relation Not Available;
 
Publisher Not Available