The lead author of a major study which found that neonicotinoid pesticides harm honey bees has hit back against criticism from the chemical companies that part-funded the work.

Dr. Ben Woodcock from the Centre for Ecology and Hydrology (CEH), said Bayer and Syngenta, which produce the controversial pesticides, had looked to undermine his work after it was published, despite providing $3 million in funding.

Speaking exclusively to Energydesk, he said:

"From a personal perspective, I don't really appreciate having them accuse me of being a liar. And accusing me of falsifying results by cherry-picking data. That's not what we've done. I've got little to gain from this and it's been a major headache. We just present the results we get."