On the Guardian page on this report someone linked to a study suggesting electro magnetic radiation disrupts insects bio mechanics - I have no idea how valid the study is but :
https://ehtrust.org/science/bees-butterflies-wildlife-research-electromagnetic-fields-environment/
(one of the reports cited there is by a certain Cucurachi, C - he's hopping mad about it)
- joking aside if this has some truth to it it should be front page news