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Date: | Mon, 10 Jun 1996 16:54:55 CDT |
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Carbaryl is deadly to bees. They can pick it up on their feet and
carry it back to the colony. The XLR formulation is the lesser of two
evils. It will kill some bees but usually not the colony. Unlike
purethroid insecticides which kill bees in the field before they get
back home, a field bee can transport carbaryl home before dying. This
can result in larval death within the colony. If a colony is
inadvertantly sprayed with carbaryl that colony is likely to die as a
result. Other alternatives include any of the pyrethroid insecticides
labelled or malathion or methoxychlor or a mix of malathion and
methoxychlor. Any of these products should be sprayed in the evening
after the bees leave the field. This gives the insecticide time to
leave the field. You did not mention the crop so I am not sure about
specific insecticide recommendations.
Ray Nabors
______________________________ Reply Separator _________________________________
Subject: toxicity of sevin xlr plus
Author: Discussion of Bee Biology <[log in to unmask]> at internet-ext
Date: 6/10/96 2:00 PM
Hi all:
I was wondering if anyone knows whether I can be as bold as the
manufacturer suggests when the growers I pollinate for are using carbaryl in
the new sevin xlr plus formulation. (They say they must spray these flea
beetles now or lose the crop.) The label says that "precautionary measures
(they are speaking of beehives) may be discontinued after spray residues
have dried."
I phoned the canadian agricultural research branch of the chemical's
manufacturer and he assured me that as soon as the spray has dried I would
have no problems, it would be stuck to the foliage and foraging bees would
not take it back to the hive. But he also said that the spray was only
toxic to larvae not adults, and so I am having some difficulty believing
him, since the Hive and Honeybee gives LD50 (and an extremely small dose)
for carbaryl and I thought that these were measured on adults. A prompt
response if anyone knows anything would sure be appreciated because I have
to move bees out or cover them, and I have already been putting bees into
fields that are sprayed, but dried, and I must say with many many misgivings.
Thanks, Stan
P.s. I know about pollination contracts and spraying, and I have looked at
the pollinators homepage, etc., but these are the same people I have steady
contracts with and they say they have no choice.
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