Grease patties help control winter mites

Grease patties provide a way to help keep Varroa mite populations low during the winter, assuming they are low to start with. A hive that is already heavily infected with Varroa will not benefit from grease patties because the bees will not be healthy enough to consume it.

A grease patty with essential oils added—usually wintergreen or tea tree—helps to control mites in two ways. First, the grease tends to get all over the bees, and a slippery surface is difficult for the mites to hang onto. Some research has shown that mite drops may be two to three times greater in the presence of grease patties.

Secondly, the essential oils have a repellent effect on the mites. In addition, some research indicates that if mites come into direct contact with wintergreen or tea tree oil it can kill them outright or interfere with their breeding cycle. Although the EPA does not recognize these oils as being effective, there is much evidence in the beekeeping community that the oils work quite well. Many beekeepers keep grease patties on the hive year-round, but patties with essential oils incorporated into them should not be used when honey supers are on the hive.

Many recipes for grease patties can be found, but the one from the University of West Virginia is quite popular and appears below. The only problem I see with this recipe is the use of honey. If you do not have disease-free honey from your own apiary, do not use honey. I recommend substituting heavy syrup (2 parts sugar to one part water) for the honey unless you are absolutely certain you know the origin of the honey. This point cannot be stressed too much. Honey may contain spores of American foul brood and can easily transmit the disease to your hives. Although, harmless to humans, these spores can wreak havoc on your apiary.

The inclusion of salt provides the bees with essential minerals that they usually get from the environment when they collect water and other materials. Since these products are not collected in the winter, the salt helps to round out the honey bee diet. The sugar and/or honey simply make the patties more attractive to the bees.

The patties can be made in advance and kept in the freezer until you need them. Beekeepers usually place four or five small patties (about 2 ounces each) on the top bars and one just inside the front entrance.

Wintergreen oil can be toxic to humans when absorbed through the skin, so always wear protective gloves when mixing the patties.

Grease Patties

Yield:

One batch will treat 8-10 hives. You can easily increase or decrease the recipe size depending on your needs.

Ingredients:

4.4 pounds (2 kg) granulated sugar

3 ounces (90 ml) corn oil

1.5 pounds (0.7 kg) vegetable shortening (Crisco)

1 pound (454 g) honey

1/2 pound (227 g) mineral salt (pink color)

2.2 ounces (65 ml) wintergreen oil (or tea tree oil)

Directions:

Step 1: Pulverize the salt so that it mixes evenly throughout the patty. This also prevents water droplets from forming around salt crystals.

Step 2: Mix all the ingredients thoroughly using protective gloves.

Step 3: Make patties the size of small hamburgers.

Step 4: Store in freezer until ready to use.

By the way, if you can’t find a source of mineral salt—or you don’t want to buy a 50-pound bag—go to your pet store and buy a “bunny wheel.” A bunny wheel is nothing more than a mineral salt lick for rabbits and the bees don’t seem to object to this inclusion of rabbit food in their diet.

Rusty
HoneyBeeSuite

Comments

papa jim
Reply

I am a first year beekeeper and wanted to try the grease patties so I mixed up a small batch for my five hives. I must have did something wrong as the bees will not touch the patties. I mixed it up according to the directions that was given to me. I do have other food source for them, is this the problem?

Rusty
Reply

Some bees eat the patties and some don’t, so I wouldn’t worry about. If they needed the nutrition, they would eat them.

Cassie Pen
Reply

Would it be acceptable to do a 1/2 tea tree 1/2 wintergreen patty?

Rusty
Reply

Cassie,

It certainly would not hurt the bees but it might not hurt the mites either. It is the wintergreen oil that is harmful to mites.

Ken
Reply

There is a ton of research around essential oils; this is one abstract

Abstract

This research was conducted to evaluate acaricidal effects of some plant essences on Varroa mites and the possibility of their usage for Varroa control. First, live Varroa mites were obtained from adult honeybees with CO2 in a newly designed apparatus. Thyme, savory, rosemary, marjoram, dillsun and lavender essences at concentrations of 2 and 1 g/100 g (w/w), caused a mite mortality rate of more than 97% and 95%, respectively. Also spearmint at 2 g/100 g was able to kill more than 97% of Varroa mites. When sprayed on worker honeybees infected with mites, thyme, savory, spearmint and dillsun essences at 2 g/100 g (w/w) caused 43-58% Varroa mortality. Toxicity of thyme, savory and spearmint essences for worker honeybees was not significantly different from that of controls (acetone and water), but dillsun essence caused 12% honeybee mortality. These results showed that essences of thyme, savory and spearmint have acaricidal properties that could be used for controlling Varroa in honeybee colonies.

(http://www.ncbi.nlm.nih.gov/pubmed/12797407)

and another that talks about over a dozen oils and their benefit to varroa and AFB:

http://www.dave-cushman.net/bee/naturaloils.html

The UofWV article has been updated as well as they noticed that patties alonw may not eradicate varroa and noticed that varroa would move away from treatment areas and suggested the addition of strips in areas been might congregate.

http://www.wvu.edu/~agexten/varroa/

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