Hi all
I first posted about Chlorothalonil and CCD on Bee-L Tue, 4 Aug 2009 21:10:20 -0400

In an attempt to elucidate the causes of poor colony health in general,
and CCD in particular, two longitudinal studies were initiated in the spring of 2007.

The most commonly occurring pesticides were the
miticides coumaphos (detected in 100% of samples) and fluvalinate
(detected in 96% of samples) and the fungicide chlorothalonil.

Chlorothalonil was found in 100% of the samples of entombed pollen,
but only in 45.5% of samples of normal pollen

Dennis vanEngelsdorp, et al -- ‘‘Entombed Pollen”: A new condition in honey bee colonies associated with increased risk of colony mortality. Journal of Invertebrate Pathology 101 (2009) 147–149

¶

A new paper is out linking Chlorothalonil with bee declines:

We quantified 24 habitat, land-use and pesticide
usage variables across 284 sampling locations, assessing which variables
predicted pathogen prevalence and range contractions via machine learning
model selection techniques. We found that greater usage of the fungicide
chlorothalonil was the best predictor of pathogen (Nosema bombi) prevalence
in four declining species of bumblebees. Nosema bombi has previously been
found in greater prevalence in some declining US bumblebee species compared
to stable species. Greater usage of total fungicides was the strongest
predictor of range contractions in declining species, with bumblebees in
the northern USA experiencing greater likelihood of loss from previously occupied areas.

McArt SH, Urbanowicz C, McCoshum S, Irwin RE, Adler LS. 2017 Landscape predictors of pathogen prevalence and range contractions in US bumblebees. Proc. R. Soc. B 284: 20172181.

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html