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Subject:
From:
Juanse Barros <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Wed, 18 Sep 2013 14:01:32 -0300
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This uruguayan study is not usefull for every setting because the E.
grandis flow is a killer crop (in the australian sense).

Colonies have already rised their winter bees but are forced to work in
this "winter" flow, which pollen is known to be deficitiary in isoleucine,
therefore wasting the winter bees without the colony been able to form the
new population.

Almost anything done after this flow is useless and particularly if you
force the colonies to buildup (through protein supplementation) is worst for
them. You need to prepare those colonies in advance of this flow, not after.

I was just talking about this with a very knowledgeable uruguayan colleague

"Mi idea es que hay que buscar en "que escenario puede producir daño", en
"donde se debe esperar perjuicio", en "que manejo de los apicultores se da
esa debilidad o estrees". Por acá, la nosemosis es endémica, pero parece
producir daño en la post-floración del Eucaliptus grandis, pero no en todos
los años,ni en todos los lugares a los que se llevan las colmenas después
de esa floración.
El E. grandis es como el ulmo para Chile, florece en otoño y es la
floración que más justifica una trashumancia de unos 400 a 500 km. Esa
floración termina en invierno y las colmenas quedan en caída libre y se
hacen pomada. Pero este daño no sucede todos los años, y como las colmenas
se sacan de los montes del eucaliptus, tampoco hay daño en todos los
lugares a donde se llevan.
Parece que las que tienen mas variedad de polenes antes del eucaliptus, las
que se llevan a zonas de floración de primavera temprana (citrus y rábano),
las que menos varroas llevan, y por supuesto las de reinas más nuevas son
las que menos sufren.
Lo que es seguro, que en febrero llevás colmenas limpias de nosema al
eucalitus grandis, y a los 15 días los conteos dan sopa de nosema. Entonces
es inevitable relacionar esa presencia con los daños encontrados en la
post-floración.

My idea is that we have to (when dealing with nosema) search for "in which
scenario it could produce damage", "where i could expect damage" , "under
which managment that weakness or stress shows up". Downhere (Uruguay)
nosemosis is endemic, but it seem to produce damage in post E. grandis
flow, but not all years, neither on all sites.
It seems that the hives that had a higher variety of pollens before de
Eucaliptus, those that are brought to early spring flows (citrus,
brasicas), the ones that carry less varroa and of course those with younger
queens are the ones that suffer less.
What is for sure is that you can bring nosema clean hives to E.grandis and
after 15 days the spore count is a soup. Therefore it is inevitable to make
the relation of this prescence (of nosema) with the damage found postbloom.

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