Jeff Pettis comment channel 4 news

[Jon]

Insecticides aren't to blame for the decline of Britain's bees, the Government's top bee scientist tells Channel 4 News.

The announcement comes as a leading American bee researcher who first posed a link between insecticides called neonicotinoids and bee deaths told MPs today that his research doesn't explain bee losses seen in the US.

There is a link to the video in the url below.

http://www.channel4.com/news/bee-dec...-by-pesticides

[gavin]

Fascinating, considering the fuss that has been made lately based largely on hints about Jeff Pettis' findings. On the other hand the Guardian take a different slant. Presumably this is the chlorothalonil fungicide effects previously reported and published in Apidologie.

http://www.guardian.co.uk/environmen...s-entomb-hives

G.

[Stromnessbees]

Hi Gavin

... this is from the Guardian article:

The entombing phenomenon was first noted in an obscure scientific paper from 2009, but since then scientists have been finding the behaviour more frequently, with the same results.

I tried the link but it doesn't work.
Do you know what this obscure scientific paper is? - I would like to have a look at it.

[gavin]

Hi Doris

How are you?!

Yes, the original link from the Guardian has stopped working but you can read the paper here:

http://ento.psu.edu/directory/duv2/v...mbedpollen.pdf

The title is:

‘‘Entombed Pollen”: A new condition in honey bee colonies associated
with increased risk of colony mortality

And the abstract:

Here we describe a new phenomenon, entombed pollen, which is highly associated with increased colony
mortality. Entombed pollen is sunken, capped cells amidst ‘‘normal”, uncapped cells of stored pollen, and
some of the pollen contained within these cells is brick red in color. There appears to be a lack of microbial
agents in the pollen, and larvae and adult bees do not have an increased rate of mortality when they
are fed diets supplemented with entombed pollen in vitro, suggesting that the pollen itself is not directly
responsible for increased colony mortality. However, the increased incidence of entombed pollen in
reused wax comb suggests that there is a transmittable factor common to the phenomenon and colony
mortality. In addition, there were elevated pesticide levels, notably of the fungicide chlorothalonil, in
entombed pollen. Additional studies are needed to determine if there is a causal relationship between
entombed pollen, chemical residues, and colony mortality.

G.

[Stromnessbees]

How are you?!

Not too bad, keeping busy in my own weird ways.


Thank you very much for the link, will read the article as soon as I can.

This caught my eye straight away though:

... some of the pollen contained within these cells is brick red in color.

Brick red pollen - could it be from horse chestnut? Isn't there a variety (flowering pink?) which is known to kill bees?

[gavin]

The authors did say this:

'This fungicide may be responsible for the diagnostic color change
observed in entombed pollen, as it is highly reactive and forms
metabolites that may lead to colored products (Chaves et al., 2008).'

but if they are making such a claim they really should have demonstrated it experimentally. The alternative possibility, that the bees were collecting naturally red pollen from a plant treated with this fungicide, and that it was the pollen itself that the bees didn't like, seems more likely. Also, the sample size of 6 for entombed pollen tested for the fungicide is far too small to draw a watertight conclusion on the strength of the association.