Nav: Home

Seeing pesticides spread through insect bodies

September 19, 2018

Osaka, Japan--Pesticides have been linked with declining honey bee numbers raising questions about how we might replace the many essential uses of these chemicals in agriculture and for control of insect-borne diseases. As many governments seek to restrict uses of pesticides, more information on how pesticides affect different insects is increasingly beneficial. Greater insight into how these chemicals interact with insects could help develop new and safer pesticides and offer better guidance on their application.

Now a team at Osaka University has developed a new method of visualizing the behavior of pesticides inside insect bodies. Their findings were recently published in Analytical Sciences and highlighted on the journal's cover.

As lead author Seitaro Ohtsu explains, "There have been no reports on the distribution of agricultural chemicals in insects to date. This is probably because it's very difficult to prepare tissue sections of Drosophilia specimens for imaging studies."

Researchers from Osaka University examined an insect from the Drosophila-family, a type of fruit fly which is widely used for testing pesticides. They developed a technique that let them slice the insect body into thin sections for analysis while preserving the delicate structures of the specimen.

Imidacloprid-a highly effective nicotine related pesticide -was chosen for the analysis. Applying their sample preparation method to insects treated with this chemical allowed the team to follow its uptake, break down, and distribution in the insects' bodies.

The team applied a method that involves scanning a laser across the thin sections of the insect body to eject material from small areas of the surface. By analyzing the chemical composition of the ejected material with a mass spectrometer at different locations they were able to build up a picture of the pesticide and its breakdown products over the whole insect body.

Senior researcher Shuichi Shimma says "This is a timely contribution while the evidence for the negative effects of certain pesticides on ecosystems is accumulating. We hope our technique will help other researchers gain new insights into pesticide metabolism that might help limit the effects of pesticides to their targets without harming beneficial pollinating insects."
-end-
The article, "Development of a Visualization Method for Imidacloprid in Drosophila melanogaster via Imaging Mass Spectrometry" was published in Analytical Sciences, https://doi.org/10.2116/analsci.18SCP04.

Osaka University was founded in 1931 as one of the seven imperial universities of Japan and now has expanded to one of Japan's leading comprehensive universities. The University has now embarked on open research revolution from a position as Japan's most innovative university and among the most innovative institutions in the world according to Reuters 2015 Top 100 Innovative Universities and the Nature Index Innovation 2017. The university's ability to innovate from the stage of fundamental research through the creation of useful technology with economic impact stems from its broad disciplinary spectrum.

Website: http://resou.osaka-u.ac.jp/en/top

Osaka University

Related Pesticides Articles:

SDHI pesticides are toxic for human cells
French scientists led by a CNRS researcher have just revealed that eight succinate dehydrogenase inhibitor pesticide molecules do not just inhibit the SDH activity of fungi, but can also block that of earthworms, bees, and human cells in varying proportions.
Pesticides deliver a one-two punch to honey bees
A new paper in Environmental Toxicology and Chemistry reveals that adjuvants, chemicals commonly added to pesticides, amplify toxicity affecting mortality rates, flight intensity, colony intensity, and pupae development in honey bees.
Hypertension found in children exposed to flower pesticides
Researchers at University of California San Diego School of Medicine found higher blood pressure and pesticide exposures in children associated with a heightened pesticide spraying period around the Mother's Day flower harvest.
Banned pesticides in Europe's rivers
Tests of Europe's rivers and canals have revealed more than 100 pesticides -- including 24 that are not licensed for use in the EU.
The persistence of pesticides threatens European soils
A study developed by researchers from the Diverfarming project finds pesticide residues in the soils of eleven European countries in six different cropping systems
Honeybees at risk from Zika pesticides
Up to 13 percent of US beekeepers are in danger of losing their colonies due to pesticides sprayed to contain the Zika virus, new research suggests.
Alternatives to pesticides -- Researchers suggest popular weeds
Research proves that extracts from S. nigrum and D. stramonium, globally existing weed species, may help to protect crop systems against agricultural pests.
Seeing pesticides spread through insect bodies
Osaka University-led team provides insights into the distribution of pesticides within insects using a newly developed method of insect sample preparation.
The more pesticides bees eat, the more they like them
Bumblebees acquire a taste for pesticide-laced food as they become more exposed to it, a behavior showing possible symptoms of addiction.
Research shows pesticides influence bee learning and memory
A large-scale study published by researchers from Royal Holloway University of London has drawn together the findings of a decade of agrochemical research to confirm that pesticides used in crop protection have a significant negative impact on the learning and memory abilities of bees.
More Pesticides News and Pesticides Current Events

Top Science Podcasts

We have hand picked the top science podcasts of 2019.
Now Playing: TED Radio Hour

Accessing Better Health
Essential health care is a right, not a privilege ... or is it? This hour, TED speakers explore how we can give everyone access to a healthier way of life, despite who you are or where you live. Guests include physician Raj Panjabi, former NYC health commissioner Mary Bassett, researcher Michael Hendryx, and neuroscientist Rachel Wurzman.
Now Playing: Science for the People

#543 Give a Nerd a Gift
Yup, you guessed it... it's Science for the People's annual holiday episode that helps you figure out what sciency books and gifts to get that special nerd on your list. Or maybe you're looking to build up your reading list for the holiday break and a geeky Christmas sweater to wear to an upcoming party. Returning are pop-science power-readers John Dupuis and Joanne Manaster to dish on the best science books they read this past year. And Rachelle Saunders and Bethany Brookshire squee in delight over some truly delightful science-themed non-book objects for those whose bookshelves are already full. Since...
Now Playing: Radiolab

An Announcement from Radiolab