Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
followed the decreasing trend with further increase in temperature. The best fit quadratic form
of the equation with R 2 at eCO 2 was noticed between ‘rm’ and temperature. Other parameters
viz., ‘Ro’, ‘T’, and ‘λ’ followed a similar trend and in our study indicating that eCO 2 influenced
the lifetable parameters of A. craccivora significantly as reported earlier by Xie et al. (2014).
Relationship between temperature and life table parameters of A. craccivora on groundnut at eCO2 &
Future pest status
aCO2
Across 6 groundnut growing locations of the country, it is projected that a substantial increase
of mean temperature would occur during NF and DF climate change periods. The quantified
associations of life table parameters with the temperature at two CO 2 conditions were adopted
for predicting the future pest status during NF and DF periods. It was predicted that increased
‘rm’ (1.04) and ‘λ’ (2.08) would occur at the Kadiri location during the DF period in
comparison with BL and reflected a similar trend in the NF period also and at the rest of the
locations. Increased ‘λ’ implies more females per female of A. craccivora per day. The
reduction of ‘T’ to 8.96- 9.94 days and varied ‘Ro’ would occur at all locations studied during
DF period over BL. The percent change in ‘rm’ and ‘λ’ was predicted to be significantly higher
at six locations during both NF (up to 93 %) and DF (up to 131 %) periods. The highest percent
reduction of generation time ‘T’ is expected to be in DF (up to 12 %) than NF period (up to 2
%). At six locations, Ro was expected to increase in NF (11 %) and decrease during DF (22%)
periods.
Conclusion
The life table parameters viz., ‘rm’ and ‘λ’ would increase with varied ‘Ro’ and reduced ‘T’ in
NF and DF over BL at six groundnut locations implying the higher incidence of Aphis
craccivora with a greater number of generations during future climate change periods.
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