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Response of multiple generations of Bihar hairy caterpillar Spilosomaobliqua, feeding on castor, to elevated CO2

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Title Response of multiple generations of Bihar hairy caterpillar Spilosomaobliqua, feeding on castor, to elevated CO2
Not Available
 
Creator Srinivasa Rao, M*., Manimanjari, D., Teju Singh., Vanaja, M., Rao, V. U. M., Maheswari, M. and Venkateswarlu, B
 
Subject Castor elevated CO2, successive generations, Spilosoma obliqua, insect performance indices
 
Description Not Available
The impacts of pests on crop yields in current conditions are well known, but the
consequences of climate change on pests are complex. The importance of pests is
significant both as important yield-reducing factors and also as early indicators of
environmental changes because of their short generation times, high reproductive rates and
efficient dispersal mechanisms. Any change in the growth pattern and quality of host plants
can affect the survival and population dynamics of herbivores. The present study was aimed
to study the host mediated impact of elevated carbon dioxide which is the major
driver/factor of climate change on Bihar hairy caterpillar, Spilosoma obliqua, a polyphagous
pest of economic importance, distributed throughout India mainly in Andhra Pradesh,
Assam, Bihar, West Bengal, Punjab and Uttar Pradesh states. Multiple generation studies of
S. obliqua were conducted at CRIDA, Entomology laboratory, Hyderabad on castor grown
in Open Top Chambers (OTC’s) under two elevated CO2 conditions viz., 550 ppm and 700
ppm and were compared with ambient CO2 350 ppm (ambient). Data were recorded at
regular intervals of each generation on weight of foliage consumed, larval weight, faecal
matter released. Attempts have been made to quantify the efficiency with which insects
exploit their food plants. In total four generations were completed on corresponding CO2
conditions. Experimental results of the studies revealed that there was a significant
difference in growth and development of S. obliqua on castor. More consumption of foliage
and mean larval weights were recorded across four generations under elevated condition
than in ambient. Extension of larval duration was found significant across generations by
one day under elevated CO2 conditions. Apart from the growth parameters, larval indices
viz., approximate digestibility (AD), Efficiency of conversion of Ingested (ECI), Efficiency of
conversion of digested food (ECD), Relative Consumption Rate (RCR) and Relative Growth
Rate (RGR) were estimated across four generations. Increased AD and RCR with lower
values of ECI, ECD and RGR were observed under elevated CO2 than in ambient. Larvae
consumed more castor foliage grown under elevated CO2 and assimilated better (higher
values of RCR and AD) but grew slower (lower RGR) and took longer time (one day more
than ambient) to pupation.
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Date 2021-08-21T04:52:29Z
2021-08-21T04:52:29Z
2012
 
Type Research Paper
 
Identifier Vol 14, 130-137
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/58992
 
Language English
 
Relation Not Available;
 
Publisher Journal of Agrometeorology. Special Issue.