Neonicotinoid pesticide impacts extend to wild bees


Study tracks neonicotinoid pesticide exposure in wild bee populations. @bberwyn photo.

Are native bees at risk from systemic pesticides?

Staff Report

Native wild bees are being exposed to toxic neonicotinoid pesticides, according to new U.S. Geological Survey research in northeastern Colorado.

The research focused on native bees because there is limited information on their exposure to pesticides. In fact, little is known about how toxic these pesticides are to native bee species at the levels detected in the environment.

“We found that the presence and proximity of nearby agricultural fields was an important factor resulting in the exposure of native bees to pesticides,” said USGS scientist Michelle Hladik, the report’s lead author. “Pesticides were detected in the bees caught in grasslands with no known direct pesticide applications.” Continue reading

Are some pesticides safe for bees?

A widely used class of pesticides is probably responsible for a massive honeybee die-off.

 Study finds most neonicotinoids toxic to bees. @bberwyn photo.

New study offers more clues on neonicotinoids and bees

Staff Report

When it comes to bees, not all pesticides are equally toxic, federal scientists said after studying 42 common pesticides in a field trial.

With honeybee populations declining at an alarming rate, the new findings may give farmers and regulators some tools to guide pesticide applications. Continue reading

Is the EPA doing enough to protect bees?

Bumblebee love!

Bees are dying in huge numbers, and conservation groups are concerned the EPA is not doing enough to protect them. @bberwyn photo.

Beekeepers accuse pesticide industry of trying to ‘hijack’ public policy

FRISCO — The public comment period for proposed EPA rules on bee-killing pesticides may be over, but the battle over pesticide policies will continue, as conservation groups suspect that the pesticide industry may have exerted undue influence over the rule-making process.

Those concerns are reinforced by some of the country’s beekeepers, who say the proposed rule doesn’t do enough to address federal responsibility to address the impact of pesticides on bee deaths. The Pollinator Stewardship Council recently submitted a letter to the EPA detailing its concerns about the proposed new rule. Continue reading

Winemakers eye native American grape species as a way to reduce pesticide use


Wine without pesticides?

Chemical analysis informs potential hybridization efforts

Staff Report

FRISCO — As the widespread and disastrous consequences of heavy pesticide use become ever-more apparent, wine-makers and grape growers are trying to figure out ways to make their grapes more resistant to bugs and fungi without using toxic chemicals.

The answer may lie in crossing the domestic grape species used in most wine production — Vitis vinifera — with native wild American grapes, like Vitis californica, which make terrible wine but are pest-resistant. Continue reading

Study documents ubiquity of bee-killing pesticides


Can bees survive the age of pesticides? @bberwyn photo.

Findings suggest human health risks from inhaling pollen laced with neonicotinoids

Staff Report

FRISCO — Scientists with Harvard University’s T.H. Chan School of Public Health say their new study examining pollen and honey shows there’s a need to develop public policies that aims to reduce neonicotinoid exposure.

After working 62 Massachusetts beekeepers who volunteered to collect monthly samples of pollen and honey from foraging bees, the researchers found more that 70 percent of the samples contained at least one neonicotinoid, a class of pesticide that has been implicated the steep decline of honeybee populations, specifically colony collapse disorder, when adult bees abandon their hives during winter.

The study will be published online July 23, 2015 in the Journal of Environmental Chemistry. Not only do these pesticides pose a significant risk for the survival of honey bees, but they also may pose health risks for people inhaling neonicotinoid-contaminated pollen, Lu said. Continue reading

New bug outbreak hitting Colorado trees

State foresters say pine needle scale infestation may be linked with heavy use of pesticides in war against pine beetles

Pine needle scale is weakening and killing conifer trees in the Colorado mountains.

Pine needle scale is weakening and killing conifer trees in the Colorado mountains, possibly as a result of the earlier heavy application of pesticides used to try and kill mountain pine beetles. @bberwyn photo.

By Bob Berwyn

FRISCO — Colorado forest experts are documenting an unprecedented outbreak of pine needle scale on conifer trees in Grand, Summit and Eagle counties that may be linked with the widespread application of pesticides used several years ago to try and kill mountain pine beetles.

The intensive use of those pesticides may have wiped out beneficial insects like predatory wasps and beetles that keep pine needle scale in check, said Granby-based Ron Cousineau, district forester for the Colorado State Forest Service.

“Most of the concentrated spray for mountain pine beetle ended about three, four or five years ago. That’s when we started seeing the buildup of pine needle scale,” Cousineau said. Continue reading

Environment: EPA finally agrees to study impacts of common pesticides on 1,500 endangered species


Crop dusting.

Settlement with watchdog group may be the first step in limiting applications of harmful chemicals

Staff Report

FRISCO — Under legal pressure, the EPA last week agreed to begin a far-reaching evaluation of how some of the most commonly used pesticides affect more than 1,500 endangered plants and animals.

The study, to be completed by 2020, could be the first step toward limiting the use of atrazine and glyphosate. The EPA will also analyze the impacts of propazine and simazine, two pesticides that are chemically similar to atrazine. Continue reading


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