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View Full Version : Essential oils are effective at fumigating beehives to eradicate tracheal mites



Islander
07-13-12, 01:11 PM
MARION D. ELLIS AND FREDERICK P. BAXENDALE
J. Econ. Entomol. 9 0 ( 5 ) : 1087-1091 (1997)

ABSTRACT Laboratory bioassays were conducted to characterize t he acute toxicity of 7
monoterpenoids to tracheal mites, Acarapis woodi (Rennie), and their honey bee, Apis mellifera
L., hosts. Citral, thymol, carvacrol, a-terpineol, pulegone, d-limonene, and menthol were
applied as fumigants to mite-infested honey bees. Thymol and menthol were the most toxic
compounds to honey bees, and a-terpineol was the least toxic. Menthol, citral, thymol, and
carvacrol were more toxic to tracheal mites than to honey bees. Pulegone, d-limonene, and
a-terpineol were more toxic to honey bees than to tracheal mites. Menthol was 18.9 times more
toxic to tracheal mites than to honey bees at the LCso concentrations; however, as the
concentration increased, bee mortality increased more rapidly than mite mortality, and men-
thol was only 5.7 times more toxic at the LCgo concentrations. Probit regressions for bee and
mite mortality were parallel for citral and thymol. Citral and thymol were 2.9 (2.5-3.3) and 2.0
( 1. 0- 3. 6) times more toxic to tracheal mites, respectively, at all concentrations estimated.

From an article by mercola.com member Herbalist123: Essential oils of seven different types were tested on honey bees to kill off mites and see which the bees tolerated best/least. "Citral (from lemon myrtle, lemon grass and citrus), thymol (from thyme), carvacrol (from marjoram, oregano and to a lesser extent in thyme), a-terpineol (from pine), pulegone (from pennyroyal and to a lesser extent in mint) , d-limonene (from citrus peel) and menthol (from eucalyptus and peppermint) were applied as fumigant to mite-infested bees. The Results: ●Thymol, menthol were most toxic to honeybees ●A-terpineol was least toxic to bees ●Menthol, citral, thymol and carvacrol were more toxic to tracheal mites than to honeybees ●Pulegone, d-limonene, and a-terpineol were more toxic to honeybees than to tracheal mites ●Menthol was 18.9 times more toxic to tracheal mites than to honeybees at LC50 concentrations; however as dosages increased, bee mortality increased significantly." ●On the same report, the scientists noted that clove oil, a-terpinene (from cardamom and marjoram), terpineol (From pine and cajeput), and citronellol (from rose and pelargonium geraniums) were effective acaricides (mite and spider killers).

Read the entire pdf: http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1152&context=entomologyfacpub

Julieanne
07-14-12, 06:54 AM
So glad someone is working on a natural cure for this dreaded disease. Apparently Australia is the only country which is clear of it, and we export bees by the billions to the US. Saw it on a TV prog where they showed acres and acres of almond trees in California - as the trees were bare it looked awful.

Now if they would only interplant with a few honey-producing shrubs/trees, they wouldn't have to feed the bees sugar in winter, which can't be good for them. Or even setting aside some honey for them would cost less than the losses they are now facing. Short term-thinking for quick gain - sound familiar?