Neonicotinoid Insecticides: Efficacy, Non-target Effects, and Best Management Practices

What will you learn?

Participants will learn about the efficacy and nontarget effects of neonicotinoid seed treatments and management practices that should be considered to minimize adverse impacts on pollinators and other nontarget organisms. Learn more…

Presented by USDA Natural Resources Conservation Service – Science and Technology

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EPA Releases Four Neonicotinoid Risk Assessments for Public Comment

The U.S. Environmental Protection Agency has published preliminary pollinator-only risk assessments for the neonicotinoid insecticides clothianidin, thiamethoxam, and dinotefuran and also an update to its preliminary risk assessment for imidacloprid, which we published in January 2016. The updated imidacloprid assessment looks at potential risks to aquatic species, and identifies some risks for aquatic insects.

The assessments for clothianidin, thiamethoxam, and dinotefuran, similar to the preliminary pollinator assessment for imidacloprid showed: most approved uses do not pose significant risks to bee colonies. However, spray applications to a few crops, such as cucumbers, berries, and cotton, may pose risks to bees that come in direct contact with residue. In its preliminary pollinator-only analysis for clothianidin and thiamethoxam, the EPA has proposed a new method for accounting for pesticide exposure that may occur through pollen and nectar. Continue reading

AgriLife Research entomologist testing potato psyllids for insecticide resistance

by Kay Ledbetter, Texas A&M AgriLife

A growing resistance of potato psyllids to the neonicotinoid classification of insecticides has Dr. Ada Szczepaniec, Texas A&M AgriLife Research entomologist in Amarillo, looking to the future.

The potato psyllid is a tiny insect with sucking, piercing mouthparts that transmits a disease called zebra chip and can cause tremendous losses to producers, Szczepaniec said. Producers have used the neonicotinoid insecticides to protect their solanaceous crops, mostly potatoes, in the past. Continue reading

Preliminary Imidacloprid Pollinator Risk Assessment Technical Briefing Webinar Slated for February 18

The U.S. Environmental Protection Agency (EPA) will hold an online technical briefing on its preliminary pollinator risk assessment for imidacloprid, a neonicotinoid insecticide, on February 18, 2016, from 1PM to 2:30PM (Eastern Standard Time). Register for the webinar at https://epawebconferencing.acms.com/imidtechbriefreg/event/event_info.html. Continue reading

When neonicotinoids don’t control thrips, using more isn’t better

In Southeast Farm Press

Tobacco thrips resistant to neonicotinoid class of insecticides are  proving to be more of a problem for cotton producers in North Carolina and across the Southeast.

During the annual convention of the North Carolina Agricultural Consultants Association in Raleigh, George Kennedy, William Neals Reynolds distinguished professor of entomology from North Carolina State University, shared results of research conducted in 2014 and 2015 in the 30 counties where cotton is grown in North Carolina.  The neonicotinoid resistance research, which will continue this year, seeks to find answers to what is driving resistance and what can be done about it. Continue reading

EPA Opens Public Comment Period on the First of Four Preliminary Risk Assessments for Insecticides Potentially Harmful to Bees

The U.S. Environmental Protection Agency (EPA) has opened the 60-day public comment period for its preliminary pollinator risk assessment for imidacloprid, a neonicotinoid insecticide, in a Federal Register notice published today. After the comment period ends, the EPA may revise the pollinator assessment based on comments received and, if necessary, take action to reduce risks from the insecticide.

The preliminary risk assessment identified a residue level for imidacloprid of 25 ppb, above which effects on pollinator hives are likely to be seen and below which effects are unlikely. These effects may include reduction in numbers of pollinators as well as the amount of honey produced. Continue reading

EPA Releases the First of Four Preliminary Risk Assessments for Insecticides Potentially Harmful to Bees

The U.S. Environmental Protection Agency (EPA) has announced a preliminary pollinator risk assessment for the neonicotinoid insecticide, imidacloprid, which shows a threat to some pollinators. EPA’s assessment, prepared in collaboration with California’s Department of Pesticide Regulation, indicates that imidacloprid potentially poses risk to hives when the pesticide comes in contact with certain crops that attract pollinators.

“Delivering on the President’s National Pollinator Strategy means EPA is committed not only to protecting bees and reversing bee loss, but for the first time assessing the health of the colony for the neonicotinoid pesticides,” said Jim Jones Assistant Administrator of the Office of Chemical Safety and Pollution Prevention. “Using science as our guide, this preliminary assessment reflects our collaboration with the State of California and Canada to assess the results of the most recent testing required by EPA.” Continue reading