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Cumulative functional responses of larvae and adults of two aphidophagous ladybirds

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International Journal of Tropical Insect Science Aims and scope Submit manuscript

Abstract

The functional responses of two coccinellid-predators, viz. Propylea dissecta (Mulsant) and Menochilus sexmaculatus (Fabricius) sharing common aphid-prey, Aphis gossypii (Glover) were investigated in various heterospecific and conspecific combinations in laboratory conditions. The third and fourth instar larvae, along with adults (males and females) of the above coccinellids were fed on increasing densities (from 25 to 600) of A. gossypii, after releasing a couple of conspecifics or heterospecific coccinellids of the same stage in a microhabitat. Their cumulative prey consumption was quantified at predator species, predatory stage and prey densities levels. Despite a Type II response by predators in each combination, high proportion of prey was consumed at low and middle densities. Heterospecific females consumed prey with a maximum attack rate (0.0024) with the least handling time (0.1831 hour) than conspecific ones. Adult female P. dissecta was smaller than M. sexmaculatus but together they consumed more aphids than the two females of M. sexmaculatus due to the least interference, which supports releases of dual-predators for aphid biocontrol. Amongst larvae, duo fourth instars M. sexmaculatus had an attack rate of 0.0015 and handling time of 0.1879 hour. We conclude that duo release of adult M. sexmaculatus and P. dissecta benefits more than their single releases for the biocontrol of A. gossypii. In addition, conspecific fourth instars M. sexmaculatus were better predators in various larval combinations.

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Data have not been disclosed as the authors are keeping data for the augmentative rearing of the ladybirds.

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Acknowledgements

Authors thank Dr. Agatha Betsy for language improvement, the two anonymous reviewers for their comments and suggestions, and Science and Engineering Research Board, Department of Science and Technology, Govt. of India, New Delhi for financial assistance (Project No. EMR/2016/006296).

Funding

Dr. Ahmad Pervez is the Principal Investigator of a major project funded by the Science and Engineering Research Board, Ministry of Science and Technology, Govt. of India (EMR/2016/006296).

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AP has planned the outline of this research and designed the methodology, drafted the major part of the manuscript, figures and tables. RK and SC assisted in maintaining laboratory culture and performing experiments. All the authors read and approved the final manuscript.

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Correspondence to Ahmad Pervez.

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Pervez, A., Kumar, R. & Chandra, S. Cumulative functional responses of larvae and adults of two aphidophagous ladybirds. Int J Trop Insect Sci 42, 1569–1577 (2022). https://doi.org/10.1007/s42690-021-00678-2

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  • DOI: https://doi.org/10.1007/s42690-021-00678-2

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