Pesticide widely used in US particularly harmful to bees, study finds

Image of honey bees.

(The Guardian) Agriculture in the United States has become 48 times more toxic to insects over the last 25 years, largely due to neonicotinoid pesticides, according to the study. “We have not learned our lessons… There’s this fundamental recklessness and foolishness to introducing [neonics] and continuing down this path,” says Kendra Klein, an author of the study and a senior scientist at not-for-profit Friends of the Earth. The study can be found here.

This tiny insect could be delivering toxic pesticides to honey bees and other beneficial bugs

Image of mealybugs on a leaf.

(Science) A common pesticide may be causing more collateral damage than thought. According to a new study, neonicotinoids can kill beneficial insects such as honey bees, hoverflies and parasitic wasps by contaminating honeydew, a sugar-rich liquid excreted by certain insects. This can devastate more insects across the food web than nectar contaminated with insecticides could, the research team says, because honeydew is more abundant, especially in agricultural fields.

Adjuvants amplify the toxicity of pesticides on honey bees

Image of researcher among yellow flowers.

(EurekAlert/Society of Environmental Toxicology and Chemistry) When applied alone, adjuvants – chemicals commonly added to pesticides to help them spread, adhere to targets, disperse appropriately, prevent drift and so on – caused no significant, immediate toxicity to honeybees. However, when the pesticide acetamiprid was mixed with adjuvants and applied to honeybees in the laboratory, the toxicity was quite significant and immediate: the mortality was significantly higher than for control groups. Additionally, flight intensity, colony intensity and pupae development continued to deteriorate long after the application comparative to the control groups.

Plant probe could help estimate bee exposure to neonicotinoid insecticides

Diagram of new probe process.

(EurekAlert/American Chemical Society) Neonicotinoid pesticides continue to be investigated because of their suspected role as a contributing factor in declining bee populations. However, limitations in sampling and analytical techniques have prevented a full understanding of the connection. Now researchers have developed a new type of probe that helps to quantify neonicotinoids in plants and study their movement and distribution throughout the plants over time.