Acknowledgements
We are grateful to Dr Sorungbe A. A. for assistance in microscopy. Mr Olorunfemi O. Sunday (PhD student in Applied Entomology) and Oguntuyi Femi (a seasoned beekeeper) for their contributions.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes on contribution
AKL conceived the research, analysed the data and wrote the scripts, MMO carried out the experiment under the supervision of AKL and AOO.