Mike (an the rest)

After searching the net, the units and transformations are not that simple.
So I finally found a good reference
http://www.epa.gov/oppsrrd1/REDs/carbaryl_ired.pdf in the same units that
those on my lab report:

That is Interim Reregistration Eligibility Decision (IRED) by EPA for
Carbaryl
There on page 45 is table 17 that I copy for everyone to see

  *

Test Species *
*

Acute Toxicity *
*

Chronic Toxicity *
 *

LD50 (ppm) *
*

Acute Oral Toxicity *
*

NOAEC/LOAEC (ppm) *
*

Affected Endpoints *
 *

Mallard duck Anas platyrhynchos *

>2000

practically nontoxic

300 / 600

decreased number of eggs; eggs cracked
 *

Honey bee Apis meliferus *

0.0011

very highly toxic

--

--
 *

Laboratory rat Rattus norvegicus *

301

moderately toxic

75 / 300

decreased pup survival

As seen on this table Carbaryl is actually very highly toxic to honey bees
with LD50 of 0.0011 ppm or mg/kg.

As in the lab results of my sampled bees  I get levels of 0.04 ppm and
0.28ppm , can I stand secure in court?

I guess so.

On page 51 this reports states.

*

b. Risk to Insects
**

Acute contact toxicity *studies indicate that technical carbaryl is highly
toxic to honey bees (*Apis mellifera*) with an LD50 = 0.0011 mg ai/bee;
however, acute contact toxicity testing of Carbaryl SC, an end-use product,
indicates bees are less sensitive to formulations with an LD50 = 0.0040 mg
ai/bee. *Acute oral toxicity studies *with carbaryl reveal that technical
grade carbaryl, with an LC50 = 0.0001 mg ai/bee, is roughly ten times more
toxic than the formulated soluble concentrate (Carbaryl SC LC50 = 0.0016 mg
ai/bee). Carbaryl ranged from being moderately to highly toxic to predacious
insects, mites and spiders.

In a field study to examine the effects of carbaryl on bees when the
chemical is used to thin fruit, carbaryl SC (water miscible concentrate)
applications to  pple orchards at a rate of 0.8 lbs ai/A did not have a
significant effect on bee mortality and/or behavior. A total of five
incidents related to carbaryl are reported in the Ecological Incident
Information System . Two of the reports do not contain any data but rather
reflect general concerns expressed by the American Beekeeper Federation and
the Honey Industry Council on the role pesticides play in bee kills. The
remaining three incidents are: a bee mortality incident associated
with 0.08ppm carbaryl residues in North Carolina; another North
Carolina bee
mortality incident more likely attributable to methyl parathion than
carbaryl; and a Washington State bee mortality incident associated with
carbaryl use on asparagus. EPA also received comments from Minnesota bee
keepers expressing concerns about carbaryl on poplar groves.  EPA received
these comments after issuing the revised risk assessment.
I will comment in the near future.

Thanks to every one for the help!!!

-- 
Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
[log in to unmask]

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