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It would be helpful if the summary of the study could make clearer which fertilisers are considered a problem. Clearly this does not apply to all fertilisers. The summary refers to 'synthetic fertilisers and herbicides'. That herbicides are harmful to bees is pretty much a given, but it's unclear (to me) which types of fertilisers this applies to.

Why would herbicides being harmful to bees be a given?

The most commonly applied fertilizers in horticulture, gardening and increasingly agriculture are compound fluid fertilizers composed of a mixture of nitrogen (N2), Phosphorus Pentoxide (P2O5), Potassium Oxide (K2O), in which N:P:K ratios can differ depending on purpose. Throughout this study, we used a commercially available compound fluid fertilizer (Nitrogen, Phosphorus Pentoxide, Potassium Oxide, 10.6:4.4:1.7; Bayer, Leverkusen, Germany) following manufactures instructions (5mL/L). Neonicotinoid insecticide imidacloprid (99.7% purity, CAS Number: 138261-41-3) purchased from Sigma-Aldrich (Zwijndrecht, The Netherlands). Nominal concentration of imidacloprid was 3.5 μg/L dissolved in demineralized water in glass bottles (Solubility: 610 mg/l H2O at 20 °C). Throughout the study, chemical were applied using a single spray with a commercially available gardening spray bottle.

Pesticides and certain things are banned for flowers and flowering trees and flowers already. Not sure what the end of their research was but they thought for a while it was contributing to CCD and compromising their immune systems.

What about flies? Flies make up the vast majority of pollinators