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Daily News Blog

25
Sep

Study Finds No Benefit to Bee-Toxic Neonic Use

(Beyond Pesticides, September 25, 2015) Neonicotinoid-treated seeds do not reduce crop damage from pests, adding to a growing body of evidence questioning the benefits of using these bee-toxic insecticides, according to a study  published in the journal BioOne. Widely-used neonicotinoids (neonics), which as systemic chemicals move through a plant’s vascular system and express poison through pollen, nectar, and guttation droplets, have been identified in multiple  peer-reviewed studies and by beekeepers  as the major contributing factor in bee decline.

Susan Jergans Elkhorn WI These were taken from our garden3The study,  titled Impact of Western Bean Cutworm (Lepidoptera: Noctuidae) Infestation and Insecticide Treatments on Damage and Marketable Yield of Michigan Dry Beans, examines the relationship between western bean cutworm infestation and damage in dry beans, and the use of seeds treated with the neonicotinoid thiamethoxam, as well as soil treated with aldicarb, another systemic insecticide. Researchers have concluded that neither thiamethoxam nor aldicarb reduced cutworm damage. In fact, plots treated with these insecticides had a higher percentage of defects due to feeding by pests when compared to untreated plots, which researchers believed is  attributable to factors such as fewer natural enemies.

There have been additional reports and studies published over the past few years questioning the benefits of neonic use. In 2014, EPA released a report concluding that soybean  seeds treated with neonicotinoid insecticides provide little or no overall benefits in controlling insects or improving yield or quality in soybean production.  Also published last year was a report by Center for Food Safety refuting claims that neonicotinoids bring greater benefits than costs to farmers. In the report, researchers analyzed independent, peer-reviewed, scientific literature and found that the benefits of prophylactic neonicotinoid use via seed treatments were nearly non-existent, and that any minor benefits that did occur were negated due to  honey bee colony impacts, reduced crop pollination by honey bees, reduced production of honey and other bee products, loss of ecosystem services, and market damage from contamination events. Furthermore, preliminary reports out of the UK find that the country is poised to  harvest higher than expected yields of canola  in its first neonicotinoid-free growing season since the European moratorium on neonicotinoids  went into place in 2013. According to the UK’s  Agriculture and Horticulture Development Board’s (AHDB)  Harvest Report,  with 15% of canola harvested this year, yields are between 3.5 and 3.7 tons per hectare, higher than the normal farm average of 3.4.

In light of the  shortcomings of federal action  to protect these beneficial organisms, pollinators need  pesticide-free habitats that provide safe havens.  Take action by calling on EPA to suspend neonicotinoids now. You can also declare your garden, yard, park or other space as pesticide-free and pollinator friendly. It does not matter how large or small your pledge is, as long as you contribute to the creation of safe pollinator habitat.  Sign the pledge today! Need ideas on creating the perfect pollinator habitat? The  Bee Protective Habitat Guide  can tell you which native plants are right for your region. For more information on what you can do, visit our  BEE Protective page.

Source: BioOne

All unattributed positions and opinions in this piece are those of Beyond Pesticides.

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