10/2/20" Gmfl' - 

Gmal" Dennis wnEngelsdo

 

question about bee loss statistics
4 musages

David Fischel Wed, Jun") 2015 214:37 PM
To: 

Dennis, l'm getting queslions lrom reporters as well as colleagues wimin Bayer about howme Summer and Tmal bee
loss slalislics are caldulaied.

 

If a beekeeper had 1000 hives alive on Del 1 and 700 dl Ihese were still alive on April 1, my [5 me wima
loss is a simple 300/1000 30%.

Then let's assume that overme summer fium Apnl 1 and Del 1 ormat year the beekeeper made spins or his strong
hives mai would have added 600 new colonies in to the 700 that he started with on April 1. So the imal would
polenlially be 1300 by Del 1 a! the second yeal. However. 300 colonies died aver Iha! summer so he aclually again has
1000 colunies on Oci 1 ml the second yean So (he summerinss Vale is 300/1300 23%. Correct?

New wnal is (hemlal loss rate? ls ii a simple 30% 23% 53%7 Dr 15 it number d! 105! colonies total potential
colonies which would be (300 300) I (1300400) 315%. Or is it something else7

Thanks (or your help on this!

Dave

David L. Fischer, Plan

Direclor, Safely

Bayer CropScience

Scion" FM ABevmr um

Environmental Safely
Developmem Nonn Amenca

Bayer Clopsclerlce, LP

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comma 
Research Triangle Fa'x, NC 27709

 

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alt-nuts language: please 90 I'SpY/Dayu/ummlaaywma mm

 

 

Dennis vanngelsdorp Wed, Jun 10. 2015 a16:18 PM
To: David Fischer

i am aliaening me documenl which omlme now less files are calculated. i did neannat many were in il ii a\
your meeiing lesi week.

Your secand scenario acem we calculate Iusses from Apnl to April not Oct to Oct.
so if a beekeeper has 1000 cclonies in April and had 700 H1 Octoberwilhaui making spins l1 would be a loss rate 0130%

ll that beekeepermade splits in Galena: (say 500) 2nd repented having 1000 on apnl 1 ms loss would bee
23% wmierloss rate

the lolal loss would be ((1000 (am year 1) +600) - loao (epnl yr 
Many beekeepers complain anuui We as adding spliis mine denominelor'lowers" me less me (by Increasing the
but il we aim da mi: ii would mean (hat same beekeepers less more than 100% :neir hives which does
nol make sense. So we consider me denominator -- all colonies 31 risk of dieing in me period,

The Europeans (who dun! split as much) and have been arguing over <mums cm 
fl 1341K

Da :1 (Scher Wed, Jun 10' 2015 at 6 24 PM
Dennis van

Thanksfor the exp'anation [may have more questions once 1 get a chants mok (ms over.

 

Dave

David L, Fischer, 

mecmv, Pomnatar Safety

KS .
Bayer CropSCIence



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Enm'mnmeml Safew

Dcvc'opment Norm Amenca

saver Cropsmence, LP

 

From: Dennis vanEnge'sdorF
Sent Wednesday,June 10,2015 1 PM

To: avid Fischer

Su bject: Re: questan about bee loss smusms

 

name mm mm:

David Fischer Wed, Jun 10' 2015 at 7,01 PM
To: Denms Va".

 

OK,

:15

 



 

 

'oz'zms Gm: 

So you've bas'cally confirmed (he! the annual loss ra'e ls an esnmate of auritlon that the beekeeper mus! make up
for ln order to malntaln the slze of operation, many the media do not unders'and that mass losses are
belng campensakad for by beekeepersv when the loss rare is 30%, there are acrually 30% less colonies
'3 the US than thus were last year. And of course after a few years of 30% loss rate, we've run out oicolcnies. 
had a Bloumberg reporter tell me last year (hat he's no longer lnleresked ln doing smrles an the bee health lssue
because he vlews these annual eshmates of loss rates as "crying wolf". ltald him he's right \hax we really a(ell't
ru'mlng on: ofbees, km! the daxa are useml acme challenge beekeepersface in staylng In business.

the workshop lesl week. nape yourears we'en't bu'nlng! Really, everyone agreed the aw surveys arezne
best source of lnfo available

Thanks agaln furthe quick reply. Agaln, l'll l'lkely be tamamng vnu again when have otherquesfians.
Dave

David Fischer, when.

Dl'ecwy, Pullinawl Safety

Bayer CropSclence




 

Sdmce For A Better Li'le

Erv ronmenlal way
Development No'tl' Amerlca

Bayer Conscience, LP

From: Dennls vanEngelsdorD 
Sent, Wednesday, June 10, 2

'r Dal/Id 

Subject: Re' qumon about bee loss 

Nuns l/mall salami

 

4/5

 

10/2/2016

Gm ail - question about boo loss statistics

I am attaching the document which outline how loss rates are calculated. I did hear that many were critical of if it at
your meeting last week.
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https://mail.google.com/mail/u/O/?ui"'2&ik=Oc4b0668dO&view=pt&car-FOYA&search=cat&th=14ddf30fee713a47&siml"'14ddf30fee713a47&siml=14ddf8d9e5b3...

5/5