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Tritrophic Interactions of Cowpea [Vigna unguiculatasubspunguiculata (L.)], Aphids [Aphis craccivora (Koch)] and Coccinellids [Menochilussexmaculatus (Fab.)] under eCO2 and eTemp

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Title Tritrophic Interactions of Cowpea [Vigna unguiculatasubspunguiculata (L.)], Aphids [Aphis craccivora (Koch)] and Coccinellids [Menochilussexmaculatus (Fab.)] under eCO2 and eTemp
Not Available
 
Creator Srinivasa Rao, M*., O. Shaila, P. Sreelakshmi, S. Vennila, M. Vanaja, AVM. Subba Rao, M. Maheswari and K. Sammi Reddy
 
Subject Biochemical Aphids Degree days Life table parameters Climate change M. sexmaculatus Predation capacity
 
Description Not Available
Experiments were conducted to understand the direct and indirect effects of temperature and elevated CO2
(eCO2), on tritrophic interactions of cowpea (Vigna unguiculata subsp. unguiculata L.), legume aphid Aphis craccivora Koch and coccinellid predator Menochilus sexmaculatus Fab. Reduction of the leaf nitrogen (6%), amino
acid (6%) and protein (7%) of cowpea foliage with increased carbon (13%) and C:N ratio (21%) at eCO2 over
aCO2 indicated the dilution of biochemical constituents at first trophic level. Shortened development time, DT
and increment of reproductive rate, RR at eCO2 over ambient CO2(aCO2)was significant with increase in temperature from 20 to 35 °C. Reduction of the mean degree day, DD requirement of both nymphal
(75.79 ± 15.163) and adult stages (157.15 ± 67.04) at eCO2 over aCO2 and same was reflected in the summation DD for both the stages at eCO2 (232.96 ± 80.32)and aCO2 (247.07 ± 64.77) across six temperatures.
The ‘rm’ and ‘Ro’ increased gradually with increase in temperature followed the non-linear trend and reached
maximum values at 27 °C with shortened ‘T’ across 20 to 35 °C temperatures at eCO2 indicating the significant
variation of growth and development at the second trophic level. Decreased grub duration (23%) with increased
predation capacity (19%) of M. sexmaculatus on A. craccivora at eCO2 over ambient was noted, indicating the
incidence of A. craccivora is likely to be higher with increased predation in the future climate change scenario
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Date 2021-08-21T04:40:18Z
2021-08-21T04:40:18Z
2018
 
Type Research Paper
 
Identifier 21: 531–537
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/58955
 
Language English
 
Relation Not Available;
 
Publisher Journal of Asia Pacific Entomology