29
Jun
(Beyond Pesticides, June 29, 2015) A recent study has provided supporting evidence to previous work showing that sublethal doses of imidicloprid, a toxic neonicotinoid insecticide, impairs olfactory learning in exposed honey bee workers. Since 2006, honey bees and other pollinators in the U.S. and throughout the world have experienced ongoing and rapid population declines. The science has become increasingly clear that pesticides (especially the neonicotinoid class of insecticides), either acting individually or synergistically, play a critical role in the ongoing decline of honey bees and wild pollinators. Neonicotinoids can be persistent in the environment, and have the ability to translocate into the pollen and nectar of treated plants. “Honeybees need to learn to associate nectar reward with floral odor. One of the main reasons why flowers produce odor is so that this odor can be learned by pollinators and used to repeatedly visit the same flower species. Without this repeat visitation, pollination does not occur. We showed that a neonicotinoid pesticide, at sublethal doses, harms this odor memory formation,”  Chinese Academy of Science’s Ken Tan, who led the study, told CBS News in an email interview. Published in Nature on June 18, 2015, the study finds that “adults that ingested […]
Posted in Chemicals, Increased Vulnerability to Diseases from Chemical Exposure, National Politics, neonicotinoids, Pesticide Residues, Pollinators, Take Action, Wildlife/Endangered Sp. | No Comments »
22
Jun
(Beyond Pesticides, June 22, 2015) Two new studies raise concerns over the connection between the use of fungicides and the declining overall health of bee colonies. While  the use of neonicotinoid insecticides has been established as a  primary contributor  to declining pollinator populations, these new studies shine a light on the use of fungicides and the negative impacts their use has on overall bee health. The first study was performed after a group of local farmers asked researchers at the University of Wisconsin to assess whether it was safe to spray fungicides on crops while they are in bloom and bees are foraging. Because insecticides, like neonicotinoids, are meant to kill insects, researchers have performed numerous studies on how the use of these insecticides may harm beneficial insects as well as those they are intended to target. Fungicides, however, are not meant to kill insects, so the relationship between their use and effects on bee populations is relatively unstudied. Researcher Hannah Gaines Day, Ph.D., an entomologist at the University of Wisconsin, cautions that her team’s study, which involved five bumblebee colonies kept in field enclosures where flowers were sprayed with field-realistic doses of chlorothalonil, a  common fungicide, was small and […]
Posted in Agriculture, Alternatives/Organics, Announcements, Chemicals, Chlorothalonil, Increased Vulnerability to Diseases from Chemical Exposure, neonicotinoids, Pollinators, Take Action, Wildlife/Endangered Sp. | No Comments »
18
Jun
(Beyond Pesticides, June 18, 2015) A major international study on bee pollination involving 58 researchers finds that astonishingly few bee species are responsible for pollinating crops worldwide, and offers compelling economic rationale for conserving wild bees. The study, published in Nature Communications, calculates that the value of wild bee pollination to the global food system at $3,000 per hectare of insect-pollinated agricultural land, a number in the billions globally. However, research also indicates that just two percent of wild bee species pollinate 80 percent of bee-pollinated crops worldwide. While the study shows that contribution of wild bees to crop production is significant, researchers warn that conserving the biological diversity of bees requires more than just ecosystem-service-based arguments. “Rare and threatened species may play a less significant role economically than common species, but this does not mean their protection is less important,” says Professor David Kleijn, PhD of the Netherlands’ Wageningen University, who led the study. The economic benefits to people from nature —such as crop pollination, water purification, and carbon storage— are increasingly known as ecosystem services. The fact that nature provides these services has increasingly been used as a reason to protect the environment and its biodiversity. Research strongly […]
Posted in Announcements, Environmental Justice, Increased Vulnerability to Diseases from Chemical Exposure, Pollinators, Take Action, Wildlife/Endangered Sp. | No Comments »
10
Feb
(Beyond Pesticides, February 10, 2015) Scientists at the Universities of Dundee and St. Andrews in Scotland have found evidence confirming that the levels of neonicotinoid (neonic) pesticides bees are likely to encounter in the wild impair the pollinator’s brain cells, resulting in colony declines. Bees and other wild pollinators provide services of over $125 billion globally, but are experiencing widespread and consistent losses that have the potential to increase global malnutrition and disease if not properly addressed. Although countries and regions across the globe have taken action to suspend or restrict the use of neonic pesticides in light of their threat to bees, policymakers in the U.S. continue to delay, impose inadequate changes, or even introduce new bee-toxic chemicals. The recent study, Chronic exposure to neonicotinoids increases neuronal vulnerability to mitochondrial dysfunction in the bumblebee (Bombus terrestris), published in the Journal of the Federation of American Societies for Experimental Biology, finds a mechanistic explanation for previous findings that observed poor navigation and foraging in colonies of bumblebees exposed to neonicotinoids. To do this, researchers exposed bumblebees to doses of the neonics imidacloprid and clothanidin generally expected to be seen in the field (10 nanomoles[nM]/2.1ppb), and measured the amount that accumulated […]
Posted in Chemicals, Increased Vulnerability to Diseases from Chemical Exposure, International, neonicotinoids, Pollinators, Take Action, Wildlife/Endangered Sp. | No Comments »
05
Nov
(Beyond Pesticides, November 5, 2014) New research from Pennsylvania State University reports that pesticides cause large changes in the expression of genes involved in detoxification, immunity and nutrition-sensing in bees, adding to previous research that has found that pesticides compromise bee immune function. This research also finds that bees with a diet of natural, high quality pollen exhibit greater resistance to pesticides’ deleterious effects than bees on an artificial diet. The new study, “Genomic analysis of the interaction between pesticide exposure and nutrition in honey bees (Apis mellifera),” finds that pesticide exposure can impact the expression of genes that are sensitive to diet and nutrition. The researchers, upon feeding honey bees either the miticidal pesticides, coumaphos or fluvalinate, for a period of seven days, noticed significant changes in 1,118 transcripts – or strands of RNA – in the experimental group. The transcripts include genes involved in detoxification, immunity, and nutrition. The authors report that there is substantial overlap in responses to pesticides and pollen-containing diets at the genetic level. Subsequent analyses demonstrate that pollen-based diets reduce the honey bees’ susceptibility to pesticide stress verses an artificial diet – e.g. a soy protein or no protein diet. Thus, the researchers note […]
Posted in acetamiprid, Announcements, Chemicals, Clothianidin, dinotefuron, Increased Vulnerability to Diseases from Chemical Exposure, Litigation, National Politics, neonicotinoids, Pollinators, Resistance, Take Action, thiacloprid, Thiamethoxam | No Comments »
12
May
(Beyond Pesticides, May 12, 2014) A study published in the Bulletin of Insectology substantially undercuts chemical industry arguments that neonicotinoid pesticides are not the primary contributing factor  in Colony Collapse Disorder (CCD). The results find that  hives exposed to low doses of two neonicotinoid pesticides””imidacloprid and clothianidin””do not recover from over winter losses from which  control hives quickly rebound. Researchers also discount other possible causes of CCD commonly touted by industry like diet, parasites, and pathogens. The study adds to the already expansive literature that  clearly links sublethal exposure neonicotinoid pesticides to rapid bee declines nationwide. The study, Sub-lethal exposure to neonicotinoids impaired honey bees winterization before proceeding to colony collapse disorder, was conducted in central Massachusetts during the 2012-2013 winter at three different locations with six bee colonies in each location. A third of the colonies were exposed to low doses of the pesticide imidacloprid, while another third were exposed to the pesticide clothianidin, both neonicotinoids, and the remainders were not treated. At each apiary the colonies were separated into two groups in which honey bees were fed with either sucrose water or high-fructose corn syrup (HFCS) over the study period. During the fall and winter seasons, researchers found […]
Posted in Chemicals, Clothianidin, Imidacloprid, Increased Vulnerability to Diseases from Chemical Exposure, neonicotinoids, Pollinators | 1 Comment »
