Need Bees Removed?
International
Beekeeping Forums
July 25, 2014, 03:31:32 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: 24/7 Ventrilo Voice chat -click for instructions and free software here
 
   Home   Help Search Calendar bee removal Login Register Chat(1)  

Pages: [1]   Go Down
  Print  
Author Topic: Are miticides killing our bees slowly?  (Read 958 times)
Paraplegic Racehorse
House Bee
**
Offline Offline

Gender: Male
Posts: 146

Location: Richland, Benton County, Washington State

Kilted beekeepers unite!


WWW
« on: April 29, 2008, 05:01:03 AM »

http://scholar.lib.vt.edu/theses/available/etd-08162007-092313/unrestricted/lmburley.pdf

Abstract
The effects of miticides on the reproductive physiology of queens and drones were examined. The first study examined the effects of Apistan® (fluvalinate), Check Mite+ (coumaphos), and Apilife VAR® (74% thymol) on sperm production and viability in drones. Drones from colonies treated with each miticide were collected at sexual maturity. Sperm production was determined by counting the number of sperm in the seminal vesicles. Sperm for viability assays was analyzed by dual fluorescent staining. Apilife VAR® and coumaphos significantly lowered (P<0.0001) sperm production and coumaphos treatments caused a significant decrease (P<0.0001) in the sperm viability.

The effects of miticides on queens was examined by treating queen-rearing colonies and examining the number and viability of sperm in the spermathecae of newly mated queens. Queens from each treatment group were collected after mating and the spermathecae were removed and analyzed. Colonies treated with coumaphos failed to provide viable queens and were excluded. Apilife VAR® was found to significantly
decrease (P<0.0016) sperm viability. No significant differences in sperm numbers were found between treatments.

The effect of miticides on sperm viability over time was also examined. Drones were reared as described, but the spermatozoa were collected as pooled samples from groups of drones. The pooled samples from each treatment were subdivided and analyzed periods of up to 6 weeks. Random samples were taken from each treatment (n = 6 pools) over a period of 6 weeks. The exposure of drones to coumaphos during development significantly reduced sperm viability for all 6 weeks, and caused a large decline in week 6. The potential impacts of these results on queen performance and failure are discussed.
Logged

I'm Paraplegic Racehorse.
Member in good standing: International Discordance of Kilted Apiarists, Local #994

The World Beehive Project - I endeavor to build at least one of every beehive in common use today and document the entire process.
Robo
Technical
Administrator
Galactic Bee
*******
Offline Offline

Gender: Male
Posts: 6391


Location: Scenic Catskill Mountains - NY

Beekeep On!


WWW
« Reply #1 on: April 29, 2008, 08:14:04 AM »

This was discussed here-> http://forum.beemaster.com/index.php?topic=12273.0

Check it out, there was some interesting discussions.
Logged

"Opportunity is missed by most people because it comes dressed in overalls and looks like work." - Thomas Edison


Pages: [1]   Go Up
  Print  
 
Jump to:  

Beemaster's Beekeeping Ring
Previous | Home | Join | Random | Next
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines | Sitemap Valid XHTML 1.0! Valid CSS!
Page created in 0.274 seconds with 22 queries.

Google visited last this page July 09, 2014, 10:08:17 PM
anything