The link below is to the Colony Collapse Disorder
page of the Agriculture Research Service
of the United States Department of Agriculture
. There are a multitude of links to articles dealing with the many topics related to pollinator decline. In the U.S. honey bees are not native, nor are the types of plants which they pollinate. Something like a third of the food we eat is dependent on bees for pollination. There are other pollinators but they can not be controlled like bees can. So, the health of honey bees as a whole is important.
A friend of mine is a bee keeper. She has a large, multi acre, tract of land where she has her hives. Being an organic gardener she is generally opposed to the use of pesticides. This may have some bearing on the good health that her bees have enjoyed to date. The fact that her land is not adjacent to other farms is probably more to the point.https://www.ars.usda.gov/oc/br/ccd/index/
The EPA page is also of interest.https://www.epa.gov/pollinator-protection/colony-collapse-disorder