I have a few thoughts and some new information to share with you regarding bees and other insects, and I figured I'd gather them into this one post. None of them are connected and yet all of them are connected; I'm feeling a little scattered this morning but I'm hoping it will all evolve into a cohesive whole.
Firstly I've been wanting to share with you some new facts about honeybees and pesticides. As you know, I belong to my local beekeeping association (MDBA) and they have monthly meetings with guest speakers covering all sorts of topics. In May, we heard from a research scientist about the recent study he participated in; namely the amount of pesticides making their way into urban beehives. The effects of persistent, continuous use of pesticides in agricultural fields is well studied and known, but until now, no one had studied the effects on urban and suburban hives.
Perhaps it may surprise you to know that the amount of pesticides used by homeowners is quite high. According to the USGS, the amount of pesticide runoff in urban streams is higher than in agricultural streams. This tends to be due to user error. In agricultural settings, everyone is trained in the proper use of poisons; it is required by law. No such law is required for homeowners, and we tend to think "if a little works, a lot will work even better!" (This is true for herbicides and fertilizers too by the way.) So homeowners tend to go overboard on the amount of chemicals they use.
Anyway, this particular study was performed over two years in urban areas all over the country: Sacramento, the Bay Area, and San Diego in CA; many also in Texas, Michigan, and Florida. (Side note: This researcher worked for Bayer. You might remember that Bayer and Monsanto merged last year. Bayer/Monsanto, along with Syngenta, are the largest producers of pesticides. You may wonder why a large producer of pesticides underwrote this particular study. I did. But I also trusted that this scientist was on the up and up and reported the findings fairly, despite who paid for it. This didn't stop a general backlash by many in the MDBA community, which I witnessed when I went up to talk to him afterward; he got pretty lambasted for taking money from Bayer to perform this study. A valid concern. But one I don't want to talk about here.)
There were several guidelines regarding the location of the hives, how far apart they were from each other, how many hives each beekeeper had, etc (although all were Langstroth hives). The scientists took fresh nectar from all the hives every month, along with fresh pollen. This was done in an interesting way: The scientists requested the beekeepers to add a new frame to the hive two days before they arrived, and so whatever nectar was in those frames was fresh; and they installed a sort of brush thingy at the entrance of each hive at the same time to collect fresh pollen. Then these two products were tested for about 200 common pesticides, including neonicotinoids (systemic pesticides). Plus, they had one graduate student who, for two years, identified all the different pollens that were coming in and determined what the bees were feeding on depending on the season, which was very interesting (more tree pollens than I would have thought - don't discount trees when you're planting for bees!).
The results were encouraging, I thought. Michigan had the worst amounts, but they still weren't terrible. California was definitely on the 'low' side. Fresh nectar had almost negligible amounts of pesticides, but the ones that showed up the most were the systemic ones (still negligible though). Pollen had a greater amount, but still in levels well below anything that would harm humans. So of course the next question is, would that amount harm the bees? And the answer is, yes, but in an amount the researchers felt was acceptable. It's a standard ratio used for most testing of these kinds of things, and it's not perfect. They assume a certain amount of loss is okay. As beekeepers, we might assume any amount of loss is not okay. Still, the results were much better than I feared, and we don't have to worry about eating our local honey. At least here, that is.
Agricultural fields are a different story. Remember the post I wrote last week about Iowa and the lack of bees in the gardens on campus? Think about what Iowa mostly consists of - huge amounts of land are given over to agriculture, just like a large portion of the midwest. Those enormous areas (we're talking hundreds of miles) are mostly GMO corn and soy. Those areas don't have any insects at all. So it's no surprise that the local areas that do welcome insects don't have any.