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Population Dynamics of Rice Brown Planthopper (Nilaparvata lugens Stal.) in Field and Natural Enemy-Free Condition: Life Table Parameters

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Title Population Dynamics of Rice Brown Planthopper (Nilaparvata lugens Stal.) in Field and Natural Enemy-Free Condition: Life Table Parameters
Brown plant hopper
 
Creator K. Vanitha
 
Subject Life table, brown planthopper, kharif, spiders, survivorship curve
 
Description Not Available
The life table of rice BPH was studied under field and natural enemy free condition on three
rice varieties viz., PTB33, Udaya and TN1 representing resistance, moderate resistance and
susceptibility to BPH respectively. Under field condition, BPH mortality was very high in all the
three varieties and all the growth stages starting from egg to adult stage due to high predation
of spiders and to lesser extent by mesovelid bugs and Dryinids. The population trend index
was low, recording 0.72, 2.11 and 2.15 respectively for PTB33, Udaya and TN1, whereas, it was
higher recording 13.20, 22.28 and 25.55 respectively under natural enemy free condition. BPH
population assumed a near type II diagonal survivorship curve. Mortality survival ratio (MSR)
was the highest for the 1st and 2nd instar BPH and as the insects grew, MSR values gradually
dwindled and again at 5th instar stage there was a rise. Indispensable mortality (IM), at egg
stage was maximum followed by early instars in all the three varieties examined and was
minimum during late instars and adult stages.
Not Available
 
Date 2019-12-04T11:30:14Z
2019-12-04T11:30:14Z
2012
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/27399
 
Language English
 
Relation Not Available;
 
Publisher Madras Agricultural Students Union